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Sep / Oct 2018 No. 85 R60-00

Irrigation Feature

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CONTENTS Tshala in the Cape...................................................................3 2018 ILASA Conference......................................................4

Editor Karyn Richards Email: karyn@eaglepub.co.za Tel: 011 326 0303 Fax: 086 714 0448

Marketing Manager Brenda Visser

Jukskei Park..............................................................................7 New Court Steenberg........................................................10 Hilton Quarry Rehabilitation.............................................14 Greened Up............................................................................16

Tel: 082 491 3881

Publisher The Eagle Publishing Company

Irrigation Feature

Tel: 011 326 0303 Fax: 086 714 0448

SABI: Saving Water A Mission for Us All........................18

Website: www.eaglepub.co.za

The Eternal Forest

P.O. Box 41928, Craighall, 2024 The Cottage, 47 Rothsay Avenue, Craighall Park, Johannesburg

Rob Furney Tel: 011 326 0303 Fax: 086 714 0448 Email: rob@eaglepub.co.za

Design Jackie Nene Tel: 011 326 0303

Subscriptions The Eagle Publishing Company P. O. Box 41928 Craighall, 2024 Tel: 011 326 0303 Fax: 086 714 0448 Copyright - The Eagle Publishing Company. No part of this publication may be reproduced, stored in a retrieval system or transmitted in

ON THE Elaleni EstateWEB This and previous issues of Landscape SA are available online at http:/www.landscape-sa.co.za

any form or by any means, electronic or mechanical, without prior written permission. The Eagle Publishing Company is not responsible for the views of its contributors. ISSN 1817-4715

On the Cover Cover sponsored by WHS. landscape sa - Sep / Oct 2018 1


Editor’s comment THE GLYPHOSATE DEBATE Glyphosate is a chemical ingredient in the herbicide Roundup and has been used worldwide since its introduction in the 1970s in agricultural and garden products. The debate as to whether it causes cancer has raged on for many years, but the jury is still out. Opposing views abound, and no doubt will be ongoing. I did a bit of research on the Internet and below are a few extracts from different sites. I give full acknowledgement to all of them. In March 2015, the cancer research arm of the World Health Organisation announced that glyphosate was probably carcinogenic to humans but the assessment by the International Agency for Research on Cancer based in Lyon, France, was followed by a strong backlash from industry groups, in particular from Roundup manufacturer Monsanto, an agrochemical company based in Missouri, USA. In an article on News 24 (14 August 2018), writer Riaan Grobler stated that a jury in the US found that a former school groundskeeper, Dewayne Johnson, is dying of non-Hodgkin lymphoma believed to have been caused by his exposure to Roundup. Johnson’s claim is one of 5 000 similar lawsuits against the company across the US, and Monsanto has been ordered to pay damages to him. When Monsanto SA was approached for comment on the matter, they issued the following response:“We are sympathetic to Mr Johnson and his family but this decision does not change the fact that more than 800 scientific studies, reviews and conclusions by the US Environmental Protection Agency, the US National Institute of Health and regulatory authorities around the world support the fact that glyphosate does not cause cancer and did not cause Mr Johnson’s cancer.” According to organic farmer Angus McIntosh, glyphosate is used in most food products sold worldwide. In South Africa, it is used to keep pathways clean, amongst other things.

Research done by Barend Koortzen for his Master’s Degree in human molecular biology at the University of the Free State in 2017 confirmed the presence of glyphosate in a variety of foods bought at South African supermarkets. He said that as glyphosate is not removed from grain by washing, cooking or processing, it can be detected in processed food products. Miriam Mayet, director at The African Centre for Biosafety (ACB), told News 24 that the ACB had approached government in 2016 to ask that glyphosate be banned. “They said they couldn’t because it had been given the thumbs up by the European Food Safety Authority.They don’t seem to want to engage in the issue in a meaningful way,” claims Mayet. Citing research from the ACB, she maintains that glyphosate poses multiple risks to the environment and people. Prof. Michael Herbst of the Cancer Association of South Africa told News 24 that glyphosate was not toxic by itself but that as soon as it was included in a mixture such as Roundup, it becomes “highly toxic and causes cancer – there is no doubt about it”. In May 2015, the South African Department of Agriculture, Forestry and Fisheries stated: “All glyphosate-based products that are registered for use in South Africa have been through a robust chemical risk assessment process. Based on these, glyphosate poses a minimal risk to users and the general public, provided it is used according to label and safety instructions.” Confused? Me too! It seems consensus can’t be reached but read the articles in full on the Internet and decide for yourself. Acknowledgement is given to all sources and writers quoted above from www.news24.com and www.scientificamerican.com

Karyn Richards

Editor

Landscape SA magazine and Landscape SA Buyers Guide are online www.landscape-sa.co.za www.landscapebuyersguide.co.za To advertise contact Brenda Visser on 082 491 3881 landscape sa Buyers’ Guide 2018/9

landscape sa

Jul / Aug 2018 No. 84 R60-00

Nursery Feature

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May / June 2018 No. 83 R60-00


TSHALA IN THE CAPE

After visiting numerous active industry players in the middle of 2017, the management of Tshala Plant Brokers decided that there was a great, untapped potential for business in the Western and Eastern Cape. It is surprising how many landscaping projects are taking place in the Cape despite the drought, and Tshala’s aim is to build client confidence in the value and reliability of its services, so that once the drought breaks, it will be a well established company in the Cape.

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Cape, they consider it a challenging market where shala is thrilled to announce that John they need to build client confidence in their abilities Simone (previously of Servest) has joined and service value. They feel sure this is a challenge the company as its Regional Manager and the company is up to in the very capable hands of has been tasked with the establishment, Simone, who has years of horticultural and marketing marketing and growth of the Tshala office in Cape experience. Town (currently with the support of the Gauteng Tshala offers a plant broking service to the whole administrative staff). It is hoped that once they have of South Africa and its neighboring countries, which a good client base in the Cape, the Cape branch will could be helpful to Cape-based clients wanting to increase its staff complement and flourish under venture into projects beyond the provincial borders. Simone’s leadership. A few projects they have been involved in over the Tshala Plant Brokers has been in operation for Gail Dreyer, founder of past year are: the past 14 years, with its head office near Pelindaba, Tshala, and John Simone, Campus Key Port Elizabeth, Boschendal (colour Gauteng supplying plants to many large residential, regional manager of Tshala Cape plantings), ongoing Spier garden development, Sante Spa school and commercial developments. The company’s Paarl,Table Bay Mall, South Hill Vineyards and numerous policy is to respect and be aware of its competitors in the industry, at the same time placing emphasis and focus on client large residential gardens in Cape Town and surrounds. Tshala Plant Brokers looks forward to supplying a reliable, valuable establishment and service. Tshala Plant Brokers is constantly looking for upcoming, professional service to all its clients, including new ones from the Cape. lsa suppliers to expand its current scope of suppliers with whom, over the years, they have established firm, mutually beneficial relationships. For further information contact John Simone on Being a relatively new concept to the landscaping industry in the cape@tshala.co.za or 082 903 4341

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2018 ILASA CONFERENCE The 2018 ILASA Conference took place in August in the Drakensberg and the paper below, entitled Landscape Architecture: Connecting through Technology, was presented by Lucas Uys of Uys & White Landscape Architects, KZN. It explores case studies which exemplify the connection between science and art. Landscape structures combined with modern technologies become the language of expression.

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he following three projects, namely The Eternal Forest, The Bluff Whale and The Baobab Tree, explored dynamic structures that captivate the visitor, examine the innovative use of material and technologies that create opportunity.

Different swamp forest trees encouraged the planting of diverse species

The Eternal Forest: Connecting Through Technology The structural element is inspired by the succession of different tree species in one of a few swamp forests still existing in KZN. Similar to human life cycles, the diverse tree species in the forest also have different life spans.The trees’ lifecycles interact with the neighbouring trees and affect each other.

The Eternal Forest

Eternal forest at Elaleni Estate. The infinity symbol inspired the dynamic form.

Elaleni Estate

Structural design using aluminium magnesium alloy for its non-rust qualities

Eternal forest structure integrated into the road scape of Elaleni Forest Estate

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The rings will be planted with trailing species, pioneer and climax creepers which will green the circles and celebrate the forest.

In nature, in a new forest, trees in succession - from pioneer trees to climax trees - take more than 70 years.Therefore the structure has three rings interacting differently, from horizontal to angled, supporting the delicate balance we find in nature. The trees in the forest are like living generators, exchanging carbon to oxygen, the most important element for all living creatures. To promote succession we have made provision to house a series of solar PV panels to generate the power for the landscape lighting in the area. The rings are made from aluminium magnesium alloy. The external diameter is 12m and the internal ring has a 10m diameter. These rings are at 15 and 40 degree angles respectively, with the inner circle facing north to achieve maximum solar exposure to the internal PV panels. The rings will be planted with trailing species, a combination of pioneer and climax creepers which will green the circles and celebrate the forest. The bottom hedge will be mostly Pork Bush (Spekboom), a plant species which is significant as it delivers, per volume, the highest carbon oxygen exchange in nature. The mission of this project was to design a dynamic focal element which would exemplify off-the-grid energy, and signify a succession of trees in one of the few swamp forests left in KZN. The following criteria influenced the design process: • the infinity symbol inspired the dynamic form; • the succession of different swamp forest trees encouraged the planting of diverse species; • structural design with innovative material use – aluminium magnesium alloy used for its non- rust qualities; and • off the grid energy – solar PV panels incorporated into the structure.


Impression of the Bluff Whale inspired by the framework and graceful movement of whales

Planting the sides of the tunnel will green the urban space

The Bluff Whale: Connecting Through Identity & Eco-Tourism The Bluff in KZN is one of the best whale spotting areas in South Africa.The aim of the development is to market the area through ecotourism and generate identity through place-making. The project also intends to separate the Bluff’s industrial zone from the residential zone by proposing a scaled-down user experience similar to a residential area. The form of the sculptural tunnel is inspired by the Aerial plan illustrating the separation of two zones framework (skeleton) and shape (body movement) of the whale. The Baobab Tree: Connecting Through Culture The skeleton of the whale transforms the structural aesthetic and The metal tree is part of the road landscape at the prestigious Izinga the dramatic curve in the spine is indicative of the whale’s graceful Residential Estate, and the structure creates interest in the landscape, movement pattern. Between the columns (rib cage), a mesh will allow also becoming a landmark for the estate. In African tradition, trees climbers up the sides of the tunnel, ensuring a ‘greener’ urban space symbolise a point of arrival where the community waits to be and a unique visitor’s experience. announced to the N’kosi (chief or king). The mission of this project is to market the best whale spotting The Baobab is one of the most iconic trees with specimens area in South Africa, namely the Bluff in KZN, to create identity reaching ages in excess of 2,000 years. Throughout Africa, Baobabs through place-making and to separate industrial and residential areas. change in character to suit their environments but are nevertheless The following criteria influenced the design process: always an unmistakable monument of African character. • height and width restrictions were explored by designing in This Baobab structure was inspired by an imposing giant that section and 3D modelling; dominates the landscape around Mapungubwe and is the first • innovative material choice; structure of a series of iconic African tree structures developed by • structural challenges to mimic the whale’s internal framework; Uys & White Landscape Architects, KZN. • scaling down industrial to residential; Manufactured by EFM Engineering, the Baobab structure is 8m • creating a visitor’s experience (residential scale); and tall, and is manufactured from aluminium magnesium alloy. It weighs • creating an ‘external lounge’. approximately two tons. landscape sa - Sep / Oct 2018 5


The metal tree is part of the road landscape at Izinga Residential Estate in KZN and functions as an arrival icon and landmark, enhancing the spirit of place The tree is eight metres tall and comprises different segments to create 3D proportions. Photo by Eco Photography.

View of the Baobab from Herrwood Drive. It has an organic raw finish to create an African character. Photo by Supermoon Media.

The mission of this project was to: • design an African arrival icon; • integrate the icon with the road landscape of Izinga; and • allow the icon to generate interest and become a landmark to residents and visitors. In the design development, the following criteria influenced the design process: • scale - 9m tall; • aluminium magnesium alloy; • five different ‘flat’ segments to create 3D proportions; • massing - bulking up tectonic segments; • orientation; and • the approaching vista presents an organic, raw finish to create an African character.

Conclusion The paper concluded and confirmed that dynamic/innovative landscape structures working together with modern technologies can become a language of expression. Arrival icons or elements in the landscape create identity and can enhance the genus loci (spirit of place).

About the author Lucas Uys is one of the founding members of Gouws, Jordaan, Uys & White Landscape Architects, established in 1980. The company has been exposed to more than 3 000 projects in over 20 countries. Uys’ interest lies in landscape urban planning projects and he is mostly involved Lucas Uys in luxury residential, boutique and mega residential estates, palaces, temples and head of state buildings. He was appointed by the president of the UAE to serve for three years as his personal landscape architect. He is also involved in many rural concepts for sustainable living based on intensive agricultural integration and has over 40 years’ experience in the profession. He is passionate about integrating science and art. lsa Text and photos supplied by Uys & White Landscape Architects, KZN

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Concrete benches and tables provide an opportunity for environmental education in the form of artistically painted plants and insects

JUKSKEI PARK

Project Team Client: Johannesburg City Parks and Zoo (JCPZ) Project Managers: Maragela Consulting Engineers Landscape Architects: Silver Horn Consulting Landscape Contractors: Tswellapele/Plantwise

The Capital Infrastructure Development Department (CID) of JCPZ was responsible for the re-development of Jukskei Park in Alexandra, Johannesburg.The site was previously an existing park which had become run down, vandalised and used for illegal dumping.

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ID project co-ordinator Malcolm Fiddes says that the total area developed was 6.5 ha, accommodating passive and active recreation in the form of braai facilities, picnic areas, colourful play equipment with rubberised safety flooring, an outdoor gym, five-a-side soccer field, a multi-purpose court, chess, indigenous board games and ablution facilities. Maragela Consulting Engineers were responsible for overall project management and the design of gabion structures and concrete walkways. The project aimed to improve the ecological status and habitat integrity of the water courses within the Jukskei River water Management Unit, which is drained by the Jukskei, Sandspruit and Modderfontein Rivers. These span the areas of Waterval in Midrand, Buccleuch in Sandton, Lombardy in the N/E of Johannesburg, Alexandra, Corlett Gardens, Innesfree Park, Atholl and Morningside in the Sandton area.

A climbing wall helps children to develop their co-ordination skills

A raised mound is used as a viewing area and breaks up the flatness of the park

Some of the proposed interventions included restricting human access to the site by installing fences, re-profiling and vegetating the stream banks to allow for increased infiltration of the run-off, river clean up, removing sediment and silt, and installing erosion control fences.

Brief and landscape design philosophy Landscape architect Thabo Munyai of Silver Horn Consulting says his brief from the client was to: * address dumping, waste, alien vegetation and pollution along the river system; * address flooding and erosion along the river system through control of flow velocity and improvement of attenuation capacity; * reinstate and optimise ecological systems and environments; * improve hydrological function and water quality along the river systems; * optimise existing public open space along the river system and integrate new open spaces; * improve accessibility to open spaces and support public safety; * develop movement routes, access points and crossings along the river system to improve accessibility; * support appropriate and compatible activities within the open space, including sport, recreation and open air worship; * establish management systems which will allow for changing needs, opportunities and conditions; * foster community buy-in and pride. His design philosophy was to ensure that the park was easily accessible and that access points are equipped with support infrastructure in the form of signage and street furniture. He also ensured that high activity recreational facilities were located close to or within view of access points and that there was easy access for the aged and disabled via ramps. All open space design elements were to be robust, creating a platform for diverse and layered use. Single purpose spaces were avoided wherever possible. Paving and landscape elements were designed to be resilient to vandalism, damage, theft and occasional flood scouring. Planting below the flood line, in attenuation areas and wetlands was selected to ensure resilience to seasonal flooding, periodic inundation and occasional flood scouring. landscape sa - Sep / Oct 2018 7


Colourful play equipment with rubber safety flooring

The overall design concept aimed to create a pleasant and aesthetically pleasing environment, encourage non-motorised access, improve the use of open spaces and user safety. Bollards help to prevent undesirable motorised access.

Phasing of execution The site and boundaries were established and all salvageable elements were removed. Demolishing of existing walkways, old brick benches and ablution facilities then commenced. Vast amounts of rubble were removed and site levelling was undertaken. The site was divided into three phases and hard elements were done first, namely walkways, construction and trenching for the main irrigation line. Once the hard elements were underway, the landscape shaping was done to create viewing berms and good landscape flows. The gym elements followed after the play equipment and safety flooring, and gabions were used to stabilise eroding sections of the river bank. Trees and grass were planted last.

Installation An important requirement for the reconstruction of the park was the engagement of local SMMEs to undertake various aspects of the project. This resulted in 18 small companies being appointed, and consequently 83 temporary jobs. The Braai and picnic area for passive project involved a labour recreation intensive approach, working through a community liaison officer appointed specifically for the park. Community structures were in place to select the local SMMEs who undertook the bulk of the installation. Zak Prinsloo and Rian Slingerland of Tswellapele/Plantwise were responsible for the installation of the fencing, play equipment, lawn, benches, trees, walkway and gabion construction, and soil improvement prior to planting. Trees comprise Searsia lancea, Olea africana, Celtis africana and Combretum sp.

Gabion blocks at the main entrance announce the park and provide a sense of arrival

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An existing gathering area of the Shembi Church was retained in its original space for religious reasons

Problems and constraints The area was an old, informal dumping site and excavations had lifted rubble and construction debris to the surface. The river bank had also burst and flooded sections of the park, causing damage to newly constructed works. These were repaired after the rain subsided. Prinsloo says in addition to these challenges, vandalism was also problematic. “The site was old and run down, but we were pleased to be able to give it a second chance. The nature of the construction was therefore designed to be as robust and vandal-proof as possible, for example the main walkway is constructed of concrete rather than brick.� He made the following points about the project: * the installation was undertaken in three phases; * a re-design of the fencing was required to mitigate flooding, as the site is prone to this; * the central walkway is multi-functional and can be used for walking, cycling and skateboarding. Its stabilisation was undertaken by Tswellapele; * trees have base protection rings to ensure they are not damaged by weedeaters; * environmental education has been introduced in the form of artwork engraved on the concrete benches, showing plants and insects; * a climbing wall for children aged 3-6 helps them to develop their co-ordination skills. Like the play pieces, it is also surrounded by rubber safety matting. It consists of three pieces and was assembled on site;

Multi-purpose court for netball, basketball and tennis


Trophy - Overall Winner Trophy - Best Specialised Landscape Construction Gold - Environmental Landscape Work Gold - Specialised Landscape Construction Gold - Landscape Construction with Design by Others

Outdoor gym equipment along the main walkway with five-a-side soccer pitch on the right

Landscape Contractors for Jukskei Park Johannesburg City Parks

Wall mural painted by a local artist. It creates an inviting entrance at the park’s main gate.

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on the multi-purpose court, yellow line markings are for netball, red for basketball and white for tennis; * a grassed mound along the walkway, roughly in the centre of the park, serves as a raised viewing area and breaks up the flatness of the park; * play equipment has been placed in different sections of the park to accommodate its four different entrances; * upright gabion walls in block-type cages at the main gate create an inviting sense of arrival, as does a colourful wall mural painted by a local artist; * indigenous games such as morabaraba and diketo are placed around a giant chess board. “Alexandra is a volatile and dangerous place to work. The project was required to be completed in 18 months but Tswellapele decided to impose its own personal deadline of 8-9 months which required considerable resources for accelerated production,” says Prinsloo.

SALI Awards Tswellapele received two gold awards for the project in the 2018 SALI Awards of Excellence. It was entered in the categories of Environmental Landscape Work and Specialised Landscape Construction. lsa

Tel: 011 665 2819 Cell: 082 411 8812 Fax: 011 953 4785 Email: jenneth@plantwise.co.za Website: www.plantwise.co.za

20 Thomas Jackson Str, Oatlands, Krugersdorp P.O. Box 363, Rant en dal, 1751 landscape sa - Sep / Oct 2018 9


Aerial view of the development

Project Team Client: Equity Estates Landscape Architects: OvP Associates Landscape Contractor: Contours Landscapes (Pty) Ltd (Commercial Division) Irrigation Design: Controlled Irrigation Irrigation Installation: Turfmanzi Irrigation

New Court at Steenberg is a residential development in Tokai, Cape Town, comprising extensive landscaping, direct access to an adjacent nature reserve and pathways for walking, cycling and horse riding.The northern boundary of the estate faces onto Tokai Park which is situated on the lower slopes of Table Mountain National Park.

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he client requested a serene landscape setting for the 18 residential units which comprise cottage gardens opening onto a communal garden with a jogging track. The brief also extended to the design of the clubhouse and pool garden and favouring classical, formal garden styles and English country gardens, the client requested the incorporation of these styles in the planting layout. Landscape architect Sarah Chang says that the landscape design sought to maximise the unique setting of the estate; most of the mature trees on site were retained and a number were successfully transplanted.

Plant selection The proximity of the site to the nature reserve was a strong influencing factor in the plant selection. Many of those chosen for the English style cottage gardens were not supported by the City of

Cape Town’s environmental department and the landscape architects were requested to find indigenous alternatives. “We also needed to steer away from indigenous species that could easily propagate themselves or potentially contaminate the gene pool of the local endemic fynbos,” says Chang. She used a combination of planting strategies, placing tall, thicket style plants along the boundaries to screen the walls and provide a backdrop to the softer textural and colourful foreground planting. Thicket plants include Grewia, Brachyleana, Tarchonanthus, Plumbago, Techoma and others. The idea was that as the thicket plants grow, they can be pruned with a brush cutter into an informal hedge. For the mid-ground, plants were chosen for their leaf and flower colour and for textural effect. Species included Selago, various Salvias, Pelargoniums and soft grasses such as Aristida.These were offset against formal elements such as Raphiolepsis, Buxus and Lavendula hedges with Iceberg roses. For the foreground planting, colourful indigenous groundcovers were used, mixed with winter flowering succulents and seasonal bulbs.

Hard landscaping

One of the alleys leading to and from the central courtyard.This one leads to the wetland area.

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The water feature in the central court makes use of low white walls as a reference to the landscape elements of Cape Dutch architecture. The walls are similarly used to create benches which are strategically placed along the jogging route at the termination of axial pedestrian pathways. The paving makes use of neutral tones in rustic brick for a classic but informal look which marries the formal yet modern character of the architecture with the softness of the landscape. In line with the City of Cape Town’s bylaws, the storm water was designed to be retained on site in order to recharge the groundwater


for refilling the tanks and ensuring that there was sufficient water for each cycle. Stations were programmed to each run 2-3 times per week, either in the early morning or late evening. Watering times are reduced in winter.

Maintenance

Pathway between the wetland and the site boundary. Swales were created on the right and trees and shrubs were planted along the fence to create screening.

and to prevent the challenges of excess runoff during storm events.To achieve this, all storm water on site is directed to the ground water in order to recharge it. It is channelled through reno mattresses and agricultural drains towards the eastern boundary of the estate, where it enters a lushly planted attenuation pond. Plant species which thrive here are Monopsis unidentata, Plecostachys serpyllifolia and Muraltia mitior which grow among the various restio species.

Installation Landscape contractors Contours Commercial was responsible for the installation, consisting of grading, levelling, soil works, soft landscaping, irrigation and maintenance. Planting comprised small trees and large shrubs to screen the palisade fence, as well as softer planting to add colour and textural interest.Wetland planting was undertaken for the natural seepage area. SP Calitz, project manager for Contours Commercial, says that with the client being both the owner and developer of the property, he was very involved with the project throughout the process. Although the site was not ready for landscaping at the time of Cape Contours’ commencement, the client nevertheless wanted them to proceed. This meant there were huge amounts of builders’ rubble on site, and some damage to finished areas occurred. Other constraints faced by Contours Commercial were the following: * access to the site was limited by the principal contractor and permission had to be sought from the neighbours to offload the lawn in their driveway, and remove a fence in order to get the materials to where they were needed; * the budget for the grass was very low, resulting in poor quality sods. Fertilising and maintenance was necessary to achieve the required standard; * regular re-shaping of beds and the installation of additional piping meant that the establishment of the grass was disrupted frequently; * paving needed to be redone several times due to changes in the paving pattern; * the planting plan was also changed several times and Contours Commercial struggled to obtain financial approval and official site instructions for additional materials. Planting is mostly indigenous with a few “old fashioned favourites” such as roses, lavender and large magnolia shrubs.

Irrigation The landscaping makes use of a fully automated irrigation system which draws water exclusively from two boreholes on the estate.The boreholes were rehabilitated to improve the flow rate and water is pumped into a number of 10 000 litre tanks. The programming of the irrigation system took some adjusting to identify the optimal timing

Head of maintenance at Contours Maintenance, Heather Stipinovich, says they began maintaining the site in December 2016. She says the estate is in a fertile valley and the location is fairly Elegia fistulosa planted in the wetland protected, with good soil with other grasses and two boreholes on site providing good quality water. She says growth over the past 18 months has been excellent, resulting in necessary adjustments to the irrigation system quite early on in the management of the garden. Regular monitoring of the irrigation system during the dry summer months is undertaken and minor repairs are done by the on-site team, where necessary. While most of the plant material has thrived, there have been some casualties such as the Artemesia afra shrubs which were continually attacked by black aphids and were eventually removed. A team of five people attends to the site once a week, and this

New Court Steenberg

OvP Associates • LandscapeArchitects • Environmental Planners T: 0214621262 E: admin@ovp.co.za W: www.ovp.co.za landscape sa - Sep / Oct 2018 11


Monopsis planted between shrubs to cover soil and bare areas

Vegetable garden constructed by the Contours Design Studio and designed in-house by Lucy Schnell and Sasha Schafer

Climbing roses against trellises near the pool

is preceded by an inspection by the area manager, who then issues instructions on what is required. During the scheduled visit, the area manager spends time on the site, overseeing the work which includes pruning, hedge cutting, dead heading of seasonal plants and mostly manual weeding of garden beds. Lawn areas occasionally require accepted chemical treatments and weekly checks are undertaken for the presence of pests and diseases. To date, minimal treatments have A variety of indigenous planting (at least 20 different species). Nuxia floribunda trees were planted for screening on the fence. been necessary; paved areas are manually weeded or treated with organic herbicides. Fertilisation is done year round, but essentially in spring using organic fertilisers. It is still a new garden which had the benefit of good soil preparation at installation, and as a result of this, has not needed extra composting. However this will be necessary going forward. There are formal sections within the garden that provide structure and symmetry – where hedges require shaping and trimming – but most of the garden is planted in a “relaxed” fashion, with groundcovers and perennials being allowed to “spill” over pathways. Fruit trees such as lemons and quinces have been used in formal beds and residents make use of a fully functional vegetable garden. All garden refuse is composted in the vegetable garden and used around the site. A swale planted with a number of grass species and other wetland plants such as Zantedeschia, Kniphofia and Aloe cooperi provides a beautiful floral display in mid-winter. At this time, lawns are cut only when necessary, generally every 10-14 days. However it is cut and edged weekly during the summer growing season, with most areas being done using a ride-on mower and slopes cut with manual petrol mowers. Water conservation measures used on site include mulching, harvesting of rain water, correct choice of plant material, plant zoning, rain sensors, water storage, moisture probes and monitoring of water use on site. Wetland thicket mix

SALI Awards Contours Commercial received a Silver Award for the project in the 2018 SALI Awards of Excellence. It was entered in the category of Landscape Construction with Design By Others. It also received a Water Wise award. lsa Information supplied by Contours Commercial and OvP Landscape Architects. Photos courtesy of Contours Commercial.

Groundcover mix along one of the pathways – Gazania, Plectranthus and Bulbine

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HILTON QUARRY REHABILITATION JPJ Landscapes was involved in a project to rehabilitate the natural environment of the Hilton Quarry, situated in a previously derelict area. During the 1960s, the quarry was mined for rock in order to build the N3 highway. The quarry with natural vegetation restored

Project Team Client: Ken Collins Charity Trust in Partnership with Grace College Landscape Consultant and Contractor: JPJ Landscapes Environmental Consultants:Ground Truth Environmental Engineering

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he quarry was initially filled with huge amounts of alien invasive species (AIS) which had taken over the cliff faces, cliff tops and floor areas. The brief from the client was to rehabilitate the entire area, returning it to indigenous natural vegetation comprising grassland, wetland and woodland areas. There was to be an initial clean-out phase to remove all AIS and thereafter, the re-instatement of indigenous plant species both naturally and by way of plant introduction. The client was intricately involved during the beginning and middle phases of the project due to their strong environmental awareness and landscaping knowledge. During the later maintenance phase they remained involved but in a more overseeing capacity, undertaking site visits and providing suggestions. An ongoing eco-friendly herbicide control programme continues to ensure that eradication and mitigation of unfavourable flora is achieved and that the landscape flourishes with indigenous plant material.

Phased execution The project was envisioned as a long-term one, with an initial eradication phase where the large AIS would be removed and thereafter the rehabilitation phase would commence. The rehabilitation phase included over-seeding with an indigenous grass seed mix and the planting of indigenous pioneer species that would begin the rehabilitation phase. After the initial phase of rehabilitation, a maintenance phase began whereby plant species were introduced over a period of time; environmentally friendly AIS control spraying schedules were put in place to remove the AIS and allow indigenous species to recover and dominate the landscape. For the planting phase of the project, JPJ Landscapes followed a naturalistic design that would mimic an indigenous landscape according to the various elements on the site. The three main biomes were wetland, grassland and a woodland/ forest theme and plants were introduced according to the given ecological areas of the site. As the planting phase commenced, the focus was on diversity and self-sustaining plant species. 14

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As an ecosystem, the quarry is preparing itself for spring, when plant life will start recovering from winter

Quarry floor with good coverage of wild grass biome

Improved rains in 2017 have increased water levels

Challenges and constraints The initial eradication phase involved AIS on cliffs which required the use of specialised abseiling services to remove large Eucalyptus grandis, Solanum mauritianum and other alien invasive species.


The quarry cliffs free of alien invasive species

Indigenous planting emerging after rehabilitation

Entrance to the quarry with Aloe ferox flowering and providing strong colour

Aristea ecklonii in flower

Quarry floor near the water

Quarry driveway

The rehabilitation phase required soil improvement and given the nature of the quarry, in some areas only shale remained. Soil erosion on the steep embankments above the cliffs was another challenge faced. Over the years, ongoing composting, mulching and planting of indigenous grasses, shrubs and trees changed the biophysical composition of the soil through the organic material adding nutrient value to the soil profile. Another challenge was the issue of dassies that foraged on indigenous landscape species, especially during the winter and drought months. JPJ Landscapes was involved in the process of trying to relocate them, with the assistance of professional veterinarian Ryan van Deventer, but this was unsuccessful and they therefore had to choose plant species carefully to ensure they were non-edible for the dassie population. Two Asian water buffalo were introduced into the quarry, causing loss of vegetation due to grazing. Chris Barriga, environmentalist at JPJ Landscapes, was able to cordon them off successfully into an area of the quarry where their environmental needs were met, ensuring that their wellbeing was maintained to the highest standards possible. All maintenance schedules are now in place and indigenous plants are recovering well, with a huge improvement in the overall appearance of the site.

the project’s early stages. Site visits enabled the assessment of opportunities for the rehabilitation and enhancement of the quarry, with the following aspects in mind: • broader biodiversity throughout the sterile quarry environment; • birding and recreation; • education and research; and • aesthetic value. Key points of the rehabilitation philosophy were: • appropriate and careful plant selection matched to local soil conditions; • healthy plants to support and enhance natural ecological processes and overall biodiversity potential. With the above in mind, re-vegetation species were chosen for their spreading root systems as the lack of soil depth meant that tree planting holes would be difficult to dig. Graham recommended Aloe barberiae, Ficus ingens and F. thonningi. The re-vegetation of wetland areas involved the planting of characteristic wetland species such as Typha angustifolia, Cyperus papyrus and Juncus effuses.These were recommended as they would provide the wetland with the ability to improve water quality and appearance. JPJ Landscapes took over the project from Jo-Anne Hilliar in 2014 in a consulting capacity, project managing and envisioning the required outcome. Dereck Ramsey Services undertook the initial eradication and control of AIS in the quarry, remaining on site until June 2017. Thereafter, JPJ Landscapes continued with the maintenance of the quarry and control of alien invasive species, with assistance from Mike Farley, who offered environmental advice and expertise. He assisted with the abseiling down the cliffs to reach the alien plants and also cleared logs in the water using a chain saw and small boat. The logs were towed to the peninsula and burnt. Despite the quarry’s numerous challenges, JPJ Landscapes’ team of environmentalists and weed controllers has ensured a successful project outcome, under the direction of Judy Panton-Jones. The process of restoration has taken six years to complete, resulting in a sanctuary for wildlife, the client and the community of Hilton.

Parties involved

SALI Award

Jo-Anne Hilliar Landscape Design Consultants initiated the rehabilitation project in 2011 and environmental reports were initially compiled by Mark Graham of GroundTruth Water, Wetland and Environmental Engineering, covering the biophysical elements of the quarry at the beginning of the project. It provided guidelines and suggestions for rehabilitation procedures to be followed in

JPJ Landscapes received a Gold Award and the Tshala Plant Brokers Trophy for Best Environmental Landscape Work in the 2018 SALI Awards of Excellence. lsa

Quarry with Greyia sutherlandii in flower

Information supplied by JPJ Landscapes and GroundTruth. Photos courtesy of JPJ Landscapes. landscape sa - Sep / Oct 2018 15


GREENED UP THE INTELLIGENT USE OF WATER™ Decades before the term ‘water restrictions’ became part of the common vernacular, RainBird recognised the need to protect and efficiently use the world’s most precious resource. Its guiding philosophy, the Intelligent Use of Water®, continues to influence all aspects of its business. RainBird has spent the past eight decades developing the industry’s most comprehensive line of water-efficient irrigation solutions for everything from homes and schools to parks, sportsfields, farms and golf courses. With efficient irrigation products and practices, it is possible for people to reduce outdoor water consumption by 25% or more without having to give up the plants, trees and gardens that add so much to their lives. Water-efficient irrigation products represent just one step down a long path towards positive change and RainBird focuses on helping people learn how to use water wisely and efficiently. Employees throughout the organisation are committed to the Intelligent Use of Water and RainBird constantly teaches irrigation professionals how to design, install and operate more efficient systems, as well as educating consumers worldwide about responsible water use. Today, RainBird and its partners in the irrigation and water management industries are in a unique position to make a difference during this time of water crisis. By working together, it becomes easier for everyone to significantly reduce their outdoor water use while still enjoying the benefits that green spaces have to offer. RainBird will continue to develop products and initiatives that will help its customers make informed choices about how they use water. By taking advantage of intelligent watering products and practices, a new era of water efficiency and sustainability will be ushered in.

role in the development of ‘new’ timbers that have the strength and resilience of other building materials, but with the added warmth and stylishness of timber. One of these ‘new’ timbers is eco-friendly Rhino Wood, created from locally grown and sustainably managed plantation pine which is carbon-negative. It has qualities that match endangered hardwoods such as Balau, Mahogany and Teak, but offers a sustainable replacement for threatened rain forests. After the thermal heat and steam modification process, the timber is pressure-impregnated with a natural wax compound that plugs the naturally occurring voids in the cells to increase stability and durability. The product has been tested for a number of performance characteristics locally and abroad and is practically maintenance-free. Left to nature, it gradually matures into a grey patina. Applications include decking, cladding, pergolas, walkways, stairways and larger timber constructions where laminated beams are required. The product is chemical free, stable, resilient, fungus and rot resistant as well as termite and wood borer resistant. For further information visit www.rhinowood.co.za

For further information contact Charl le Roux on 021 975 4152

The WHS stand with its Cellfast product range

WHS Summit Trade Days

Rhino Wood decking

New Timbers Responsibly sourced and sustainably harvested timber is an environmentally friendly building material for the future. One if its many advantages is that it is an excellent replacement for energyintensive materials such as concrete or steel, because whilst trees soak up carbon and lock it away, concrete and steel emit carbon into the environment. Cutting edge timber technology has played a major 16

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The WHS Summit Trade days took place on 13, 14 and 15 September 2018 at the Kyalami Country Club in Midrand, Gauteng. In addition to exhibiting their own products, WHS’ top suppliers were also invited to exhibit. These included Stanley, Big Jim, Promax, Wirquin, Lasher, Cadac, Franke, Cape Gate, Hamiltons, Roco, SA Ladder, Assa Abloy, Henkel, Black & Decker, Grinding Techniques, First Cut and others. Events during the three days included an award for the supplier with the best stand, a golf day and a customer appreciation dinner. A “Secondz Shop” was open to the public to buy products on site at low prices. For further information contact Thereza Nothnagel on 011 323 0469.


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IRRIGATION FEATURE

SAVING WATER: A MISSION FOR US ALL By Carol Posthumus

In recent years, the South African Irrigation Institute (SABI) has seen a growth in membership from within the landscaping sector. More landscape practitioners are signing up for SABI membership, especially since the formalisation of its landscape membership category and the growing awareness of the role of optimum irrigation in water conservation in agriculture, landscape and environmental projects.

I

n the past SABI was viewed mostly as an agricultural irrigation institute, says GM Riana Lombard. “This focus or perception has changed a lot in recent years, with more landscape members coming on board as we enhance what we offer them.” SABI has more than 430 members, including agricultural and landscape designers, business owners, engineers, farmers, soils scientists, project managers, crop experts, economists, water specialists, the green industry, sports field and golf course managers. SABI has 98 company members, which include manufacturers and suppliers of irrigation, water and all related equipment in the agricultural and landscape fields, ranging from South African to international companies.

design fees, which is an important topic.” Lombard says that SABI has introduced two courses dedicated to landscape irrigation in recent years. “Students benefit from experienced lecturers and excellent topics. We present the courses both in Gauteng and the Western Cape, and are looking to expand in the future to more provincial centres.”

Training

To be able to serve the landscape irrigation industry to SABI’s best ability, an executive decision was made not to try and re-invent the wheel, but to use internationally recognised information and course material to allow for the improvement of the industry. The bestknown international body that has developed SABI President Willie Vosloo courses is the Irrigation Association of the United States of America (IA). The IA has agreed that SABI can Community present its courses with adaptations to local circumstances and over Lombard says: “We are delighted to be attracting more individual and time, will change the IA material specially to include metric units, with company landscape members to SABI. We see landscape irrigation SABI’s input. as a vital part of the irrigation industry, no matter what area of As there is a big selection of IA courses, SABI decided to start irrigation you are involved in, we are all part of the same community. with the presentation of the Landscape Irrigation System Installation We all want to play an important role in optimum irrigation and and Maintenance Course and the Introductory Landscape Irrigation water conservation, which has become the major consideration in all Design Course. The former is a hands-on course aimed at personnel areas of irrigation, whether one is irrigating a farm or a golf course, responsible for the installation, daily operation and maintenance a greenhouse or a sports field. The conservation of water in South of landscape irrigation systems. The latter is suited to personnel Africa is of prime importance, and we are proud to be playing a role in responsible for the planning and design of landscape irrigation systems boosting the knowledge of water saving in our arid country.” for residential and small commercial properties. Both courses are SABI’s focus as an institute is technical, and events such as the presented by the SABI IrrigationWise Academy. Congress feature much sharing of technical ideas and developments, In future, the selection of courses will be extended to the which boost optimum irrigation and water saving knowledge. Advanced Landscape Irrigation Design Course as well as the Landscape “We are proud to have hosted excellent and growing landscape Irrigation Auditor Course. Both courses currently presented include sessions at the Congress, and invite landscape specialists to join examination and accreditation with SABI as Landscape Irrigation us – through attendance, sponsorship, exhibiting or presenting – at Contractor and Approved Landscape Irrigation Designer. Delegates our next SABI Congress to be held in Durban in 2019. Congress that have attended these courses also have the option to write the IA is a learning event, but also one where people have fun,” she adds, exams and become internationally accredited. emphasising that SABI invites landscape members to be fully involved As South Africa is a water-scarce country, the importance of in and participate in the various SABI activities and partnerships – training more people involved in landscape irrigation cannot be such as SABI branch meetings, held in different provinces throughout emphasised enough, as the correct installation and design of landscape the year, the SABI IrrigationWise Training Academy, the SABI magazine, irrigation systems will reduce the wastage of water and improve the and the biannual SABI Congress,” says Lombard. sustainable and efficient use of the available water in the landscape. It will also promote the installation of water-efficient irrigation Designers technologies, as well as the retro-fitting thereof on existing landscape SABI’s Landscape Approved Designers is a relatively new category in irrigation systems. Landscapers trained in irrigation will also be able the widely acknowledged SABI Approved Designers rankings. The to understand irrigation designs better and will be able to judge the SABI Approved Designers status is an assurance to clients of a quality viability of a design. service from the designer. “We also would like to ask landscape SABI is also in the process of compiling a set of best management designers to be part of technical debates – such as the one regarding 18

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IRRIGATION FEATURE

SABI Council 2018

practices and norms that landscape irrigation contractor and designer members will have to adhere to.This will give clients of SABI landscape irrigation members recourse to bad practices. SABI is also a member of SAGIC (South African Green Industries Council) and supports the lobbying initiatives of SAGIC with policy makers and regulators. SABI was also recognised this year at the annual SAGIC Convention when it was awarded for irrigation training in the green industry. SABI IrrigationWise Academy also offers tailor-made programs and is involved, in the Western and Eastern Cape, in an educational

project which sees learners in agricultural high schools learning more about irrigation. “We are proud of our schools’ outreach programme, and would like to expand it nationwide. It is important that children learn about the importance of saving of water and optimum irrigation from a young age,” says Lombard. Please visit www.sabi.co.za to find out more about becoming a member or for any information on the courses presented. Carol Posthumus is the editor of the SABI magazine. lsa

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You can read both Landscape SA magazine and Landscape SA Buyers Guide online www.landscape-sa.co.za www.landscapebuyersguide.co.za To advertise contact Brenda Visser Cell: 0824913881

landscape sa

Jul / Aug 2018 No. 84 R60-00

landscape sa

May / June 2018 No. 83 R60-00

landscape sa Buyers’ Guide 2018/9

Nursery Feature

INDEX TO ADVERTISERS Arter Supplies............................................................................................... 19

Plantwise/Tswellapele Plants........................................................................9

Evergreen Turf............................................................................................... 13

RainBird.......................................................................................................... 17

Hadeco......................................................................................................... IFC

SALI................................................................................................................. 20

John Deere.................................................................................................. IBC

Tshala Plant Brokers.......................................................................................3

Multi Power Imports.............................................................................. OBC

WHS...........................................................................................................OFC

OvP Landscape Architects......................................................................... 11

Wilson Stone................................................................................................ 13

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Landscape SA Sep/Oct 2018  

Landscape SA Landscaping Gardening Flowers Irrigation

Landscape SA Sep/Oct 2018  

Landscape SA Landscaping Gardening Flowers Irrigation

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