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PODIUM LANDSCAPES A PRO LANDSCAPER SUPPLEMENT

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WELCOME

W E LC O M E T O

PODIUM LANDSCAPES A PRO LANDSCAPER SUPPLEMENT

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ABBIE DAWSON FEATURES EDITOR

Eljays44 Ltd 3 Churchill Court, 112 The Street, Rustington, West Sussex BN16 3DA Tel: 01903 777 570 EDITORIAL Editorial Director – Lisa Wilkinson lisa.wilkinson@eljays44.com Tel: 01903 777 579

elcome to Pro Landscaper’s first ever podiums supplement. With the UK’s demand for housing increasing, space is at a premium, and in urban areas a podium landscape is often the best option for those who want to create their own outside sanctuary – whether it’s a roof garden or a green space on top of an underground build. We’ve created this supplement to provide tips, tricks and product recommendations for those involved in creating podium landscapes. We speak to some of the top designers and landscapers to discover how they’ve incorporated podiums into their extensive portfolios, and gain valuable insight from

ADVERTISING Business Development Manager – Jamie Wilkinson jamie.wilkinson@eljays44.com Tel: 01903 777 585 Deputy Sales Manager – Jessica McCabe jessica.mccabe@eljays44.com Tel: 01903 777 587

Deputy Editor – Nina Mason nina.mason@eljays44.com Tel: 01903 777 583

Sales Executive – Natalie Ross natalie.ross@eljays44.com Tel: 01903 777 595

Features Editor – Abbie Dawson abbie.dawson@eljays44.com Tel: 01903 777 604

Horticulture Careers – Laura Harris laura.harris@eljays44.com Tel: 01903 777 580

Content Manager – Claire Maher claire.maher@eljays44.com Tel: 01903 777 601

Managing Director – Jim Wilkinson jim.wilkinson@eljays44.com Tel: 01903 777 589

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MARKETING AND CIRCULATION Tel: 01903 777 570

Subeditor – Kate Bennett kate.bennett@eljays44.com Tel: 01903 777 597

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Subscription enquiries – Emily Maltby emily.maltby@eljays44.com Tel: 01903 777 575

manufacturers on how to alter products to ensure they’re suitable for the unique requirements of a podium. Of course, we’ve also got a stunning selection of portfolios, including Young Street by Gardenlink, Rudding Park Hotel Spa by Matthew Wilson Gardens, and Aralia’s Chelsea Creek Penthouses – all wonderful inspiration for your next podium project. A huge thank you to everyone who has contributed to this issue. Do let us know what you think – we always welcome your feedback. Until next time,

Design – Kara Thomas

Pro Landscaper is proud to be an affiliate member of BALI

Printed by Pensord Press Ltd, Gwent, UK Published by ©Eljays44 Ltd – Connecting Horticulture Pro Landscaper’s content is available for licensing overseas. Contact jamie.wilkinson@ eljays44.com Pro Landscaper is published 12 times per year by Eljays44 Ltd. The 2018 subscription price is £95. Subscription records are maintained at Eljays44 Ltd, 3 Churchill Court, 112 The Street, Rustington, West Sussex BN16 3DA, UK. Articles and information contained in this publication are the copyright of Eljays44 Ltd and may not be reproduced in any form without the written permission of the publishers. The publishers cannot accept responsibility for loss of, or damage to, uncommissioned photographs or manuscripts. Whilst every effort has been made to maintain the integrity of our advertisers, we accept no responsibility for any problem, complaints, or subsequent litigation arising from readers’ responses to advertisements in the magazine. We also wish to emphasise that views expressed by editorial contributors are not necessarily those of the publishers. Reproduction of any part of this magazine is strictly forbidden.

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MANAGEMENT Managing Director Jim Wilkinson Director Lisa Wilkinson Business Development Manager Jamie Wilkinson

Cover image ©St George PLC

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WELCOME PORTFOLIO

CONTENTS FEATURES 0 6  DESIGNING ROOFTOPS ADOLFO HARRISON GARDENS

0 8  B U IL DIN G P O DI UMS L A N D F O R M C O N S U LTA N T S

1 0  TOP TIPS EXPERT ADVICE FOR PODIUMS

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PORTFOLIOS 1 5  IN HIGH OFFICE GARDENLINK

1 8  BREATHING SPACE M AT T H E W W I L S O N G A R D E N S

2 2 L U X U R Y L I V I N G ARALIA

TECHNICAL 2 6  CORRECT SOIL BOURNE AMENITY

2 8  THE RIGHT PLANTS PLANTS FOR PODIUMS

3 1  SOLID FOUNDATIONS EXTERIOR SOLUTIONS

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WELCOME

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DESIGNING ROOFTOPS 2

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GARDEN DESIGNER ADOLFO HARRISON TELLS US ABOUT THE UNIQUE SET OF ISSUES AND CONSIDERATIONS I N V O LV E D I N D E S I G N I N G A ROOFTOP GARDEN

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here’s no point in pretending that a rooftop garden is a natural landscape – and that offers designers opportunities to push what gardens can be,” says Adolfo Harrison, founder of Adolfo Harrison Gardens and cofounder of Cityscapes. Adolfo has over a decade’s experience in the industry and has a multitude of projects under his belt, including rooftops, courtyards and public spaces. When designing rooftops, Adolfo’s brief is generally to bring the inside out and create a practical yet enjoyable space. “A lot of roof terraces are built into new builds, and they nearly always lead from the living area of the flat,” he explains. “That means the exterior should aim to have an interior finish, and while with normal gardens you might have an interior element close to the living area before going on to create the view, with a rooftop the whole thing is that first section.” A rooftop garden is a harsh environment: open, exposed and often sterile. “To balance the openness and exposure we bring in layers, and, if possible, create a ‘ceiling’ of some kind – whether that’s crown-lifted trees or an open pergola,” Adolfo explains. “We try to create flow, so rather than one open space, we’ll create

more than one space – that way, not only does it feel larger, but it’s also a more dynamic and welcoming environment.” Perfect plants When selecting plants, people are concerned about the effects of the sun, but Adolfo suggests that the wind should be the biggest consideration. “You have to choose plants carefully – rooftops have desert-like conditions, and the plants only have so much soil space. We use a lightweight, enriched, free-draining soil and a cockle-shell mulch to keep the moisture in,” he says. “A rooftop garden struggles to develop a well-balanced ecosystem, so pests can take hold and plants can soon outgrow the pots. It’s crucial to have good gardeners maintaining these spaces.” Adolfo chooses plants that are used to windy conditions – not only are they hardier, they also counteract what can look like a very manmade landscape. “There are a lot of right angles and hard landscaping, and you need to counter that with plants that appear to enjoy being windswept. Allow space for them to grow naturally – they can grow quite gnarly and start to take over, and that’s really effective in balancing the design.”

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FEATURES

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We have to counter that ‘new development’ feel and make it feel like you’re in a garden

Materials For materials, Adolfo opts for those that age with character. “We often use Western red-cedar – it’s an ideal lightweight material. We explain to the clients that they’re getting a material that doesn’t age perfectly, but it adds a character that tropical hardwood lacks.” Another factor is how the garden feels. “We work with materials such as timber, which aren’t too cold or too hot when walking barefoot. It needs to be functional as well as attractive.” Logistics On smaller budgets where a tender isn’t needed, Adolfo and his team recommend that clients bring in contractors from the beginning, so that logistics can be considered from the get-go. “When you bring contractors in early, they become part of the design team, and we love that – one of the best parts of the job is collaborating. Brainstorming with them helps us to create a seemingly simple space, where everything is aligning perfectly and it looks almost like it hasn’t been designed – like it’s always been there and always will be there.” Challenges A challenge when designing rooftops is access;

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this is something that Adolfo keeps in mind when designing the space. “Access is the biggest issue, and that affects the price of a project, too,” he tells us. “On top of that, there are times when it’s necessary to bring in structural engineers, as well as having to submit planning applications. “With new builds, the inherent material palette is often quite stark. We’re trying to create a warm environment, but there could be a lot of glass, stainless steel, white K Rend and concrete paviours in place. We have to counter that ‘new development’ feel and make it feel like you’re in a garden, which can be challenging.” Highlights Adolfo describes rooftop gardens as ‘a fantasy environment’ and enjoys working on them, because of the more architectural situation. “We really get to push the boundaries and show what we can do, adding lots of detail,” he says. “There’s a fine line between the living environments created for roof gardens and interior design architecture. Roof gardens can require a lot of timber and structural works with finely tuned details. It can be slow work to get spot on, but it’s really enjoyable seeing it come to life.”

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Trends Adolfo has seen a lot of designs that push the boundaries of outdoor living. “We’re seeing a lot of outdoor cooking – some of our rooftops have full kitchens,” he says. “In our designs we tend to create long benches, incorporating plants, which allows us to shape the space without losing it. We also ensure that the incremental heights of all elements, such as benches, planters and tables, all relate to each other to introduce a pleasing rhythm and sense of cohesiveness that is calming on the eye. “Interior designers are currently using a lot of houseplants to bring the outside in. As garden designers, we’re adding an interior touch to roofs and balconies, while interior designers are doing the opposite, and that’s what clients are really going for now.” 1 A terrace built around a courtyard sits under a canopy of Rhus typhina ‘Dissecta’ in Highbury 2 Western red-cedar pergolas and screens being taken over by Trachelospermum jasminoides 3 Gnarly Vitis vinifera frames and shelters this exposed roof garden 4 Family dining areas can form the centrepiece of the garden, like a kitchen table would indoors 5 Plants to look through over views of Regents Park

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PRO LANDSCAPER SPEAKS TO MARK G R E G O R Y, M A N A G I N G DIRECTOR AT L ANDFORM C O N S U LTA N T S , A B O U T H I S EXPERIENCE BUILDING PODIUM LANDSCAPES

BUILDING PODIUMS Mark, how much of your work is podiums, and is there an area which has more podium contracts than others? I’d say 15-20% of our works are podiums, and most of those are in London, where space is at a premium. A lot of the podiums that we work on are at ground level, but on top of, for example, a basement garage or an underground gym. People have been using the term ‘iceberg housing’ for more than a decade now – where you can’t build up, so you have to go down. House prices in London are high and there’s little space, so you warrant building down and putting a podium landscape on – an expensive project.

A lot of the podiums that we work on are at ground level, but on top of, for example, a basement garage or an underground gym

What does your typical podium project involve? Most of our podium work is on new constructions, so we take over from the main contractor, who has already considered the garden from a weight point of view and tested for waterproofing. We work from drainage board upwards. There’s no standardised specification for podiums, they’re all quite different depending on the garden requirements; it can be lightweight growing

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FEATURES

There’s no standardised specification for podiums, they’re all quite different depending on the garden requirements

Photographs ©Tim O’Hare Associates

mediums, void fillers or using lightweight foamed concrete to create levels. Is tendering for podium landscapes competitive? All tender is competitive, but podiums need to be well considered. When working at height there are several risks and challenges involved, and when things go wrong it can be very expensive.

tend to be shoehorned into very tight areas and back gardens, so we have the same issues with access. You have weight restrictions on all podiums, so you can’t always drive straight on. Another issue is the settlement. Settlement is fine in a normal garden, but 60 storeys up, the cost of rectifying settlement is a risk, so you must get it right first time and make sure you’ve consolidated the material.

Do you take these risks and challenges into account when pricing for podium contracts? Yes. We allow for the process when pricing, but the trouble is, if you factored in everything, you wouldn’t be competitive. We look at the process and the logistics and provide a price to do the job properly, in a considered way.

What are the logistical challenges involved with podiums? Podiums are usually in highly urban areas, so at height you’ve got cranage restrictions, and perhaps temporary access to get staff, materials and tools up to a roof garden. At ground level they

What are the benefits of building podium landscapes for Landform? It adds another specialism, another technical challenge and it reinforces our trade and the need to use professional, competent people to do jobs well. It also brightens up our portfolio and shows that we’re a company that can offer various technicalities and skills.

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FEATURES PORTFOLIO

TOP T I PS FOUR EXPERTS SHARE THEIR BEST PIECES OF ADVICE FOR THOSE CREATING PODIUM L ANDSCAPES

PAUL NEWMAN

LANDSTRUCTION

PAUL NEWMAN LANDSCAPES

Check the existing roof structure’s ability to take the weight of your scheme. Seek advice from a structural engineer, who will undertake a survey of the roof structure and advise accordingly. Newer properties will usually be strengthened with concrete and steel already, but older buildings may need additional support before anything is placed on the roof. Plan in detail. Undertaking any elevated build is challenging, as access to the site can be difficult. At the design stage, note how high the build will be from ground level, any parking restrictions and local authority rules and regulations. Can materials go up in a lift or will contractors need a crane or furniture hoist? This may influence your choice of materials. Keep it simple – the best designs tend to use minimal materials while creating maximum impact. Work with a palette of three choice materials, carefully blended with a great planting scheme and clever lighting, and you are on to a winner!

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Maximise the view: elevated gardens can give the end user fantastic views that ground level gardens can’t offer. If you’re lucky enough to have this, maximise these views by planning your design carefully and incorporating a view or vista. This could be anything from an avenue of trees to an iconic landmark, especially in cities. These views can be borrowed from the landscape beyond and framed, with your planting or structures creating a framework. Incorporating seating areas also makes for a great scheme. Consider growing conditions – elevated landscapes will experience different conditions to ground level gardens. Wind, heat, drought and lack of shade can be the worst enemies of a podium planting scheme, so careful plant selection will be needed. Plants from Mediterranean and arid regions can often work well in these harsh environments. Soil will need to be imported, as trees and plants will need to be grown in containers. They will also be prone to drying out quickly in summer, so a good irrigation system is essential.

PAUL NEWMAN LANDSCAPES

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FEATURES

KATE GOULD KATE GOULD GARDENS

KATE GOULD GARDENS

Listen to what the client wants from their new scheme, and advise them what is feasible. This way, you can manage their expectations from the outset. Anything is possible, but things will often be ruled out once cost has been calculated and relayed to the client – especially in instances where implementing their ideas involves the use of a large crane. Make sure all relevant planning permissions are in place and building covenants that need to be adhered to are researched before putting pen to paper. Just because the client has a rooftop or a balcony, does not mean they can stick a terrace on it. When thinking about your initial design, always try to create privacy and a sense of seclusion in spaces that are otherwise overlooked by neighbours. Generally, a roof terrace needs to work hard in an urban environment as another well-used room of the house, and clients want to feel that they can use the space uninhibited. Ensure you add year-round interest – no one wants a space that looks fantastic for six weeks of the year and skeletal for the remainder, particularly when you factor in the cost and level of aggravation involved with installing a roof terrace/balcony. Podiums need to be useable and visually appealing all year. Although it may seem an alien concept, there will be times when artificial plants are the best option for a roof terrace or balcony space.

GARDEN CLUB LONDON

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Take advice from a qualified engineer at the design stage, and throughout the build. I have been on many a project where the drawings supplied to me are not what was installed, and if I hadn’t called in my own independent engineer there would have been serious damages incurred. Do not rely on other people’s drawings unless it is a new build and you are involved as part of the design team from the outset.

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TONY WOODS GARDEN CLUB LONDON

Work with the project engineers and architects to allow for the best substrate possible. Avoid using standard topsoil and protect the soil from other contractors during the build, as it can be prone to compaction and contamination. Look at how soil levels can be mounded at the strongest points in structures. This will allow larger plants to be included and to add interest to the scheme – even if it is creating interest in grassed areas over underground car parks and utility areas.

Consider using trees and shrubs that were grown in air pots – they tend to have a denser and shallower root system, making them more likely to establish in shallow soil. Remember that drainage layers are just as important as substrate and soil layers. No drainage = no plants! If you are working with an architect from the outset, push for as much structural support in key areas as possible, particularly where you’d like large trees and shrubs.

DAVID T BINKS LANDSTRUCTION

Podium garden construction is not dissimilar to building a show garden, with there being a finite amount of space within which to organise yourself and operate – there is very little margin for error. Project planning must be meticulous, as the knock-on effect of over-running on one element of the build can be disastrous. For example, if you’ve booked a crane in for a day’s lifting and you’re not ready for it, the accrued costs for traffic management, crane hire etc. can turn what was once a profitable contract into a money pit. 12

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When we plan roof garden builds, we break our build programmes down into hourly tranches, to ensure we are hitting our critical paths – this helps keep build teams focused and ensures managers are aware of programming issues sooner rather than later. Another key point to discuss with architects and designers is what the maximum dead and imposed loads are on the roof which you are building on. This will not only influence the design, but also determine how you organise your site, as these loads will dictate the amount of material you can store in one area. www.prolandscapermagazine.com

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Pro Landscaper podiums products - half-page ad copy.pdf

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PORTFOLIOS

IN HIGH OFFICE Y O U N G S T R E E T, LO N D O N GARDENLINK

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he client was an international company that Gardenlink had worked with on previous projects. This time, Gardenlink was approached to create a roof terrace garden for the company’s smart London offices. The brief was to create a space that could work as both an established meeting room and an entertainment area for the use of both visitors and staff. Collaboration Gardenlink worked alongside James Holderness Landscape Design, the designer of the project, and the client, discussing their requirements along the way to produce the scheme. James produced the masterplan and associated design information, while Gardenlink advised on the best way to proceed and calculated the cost. The team broke the cost down into small sections to make it clear exactly what was included in the specification, before going back to the client. Gardenlink’s services differ from some other landscape contractors in that it tries to steer the designer into the right direction with suitable plant stock, taking into consideration exposed or shady areas as well as less obvious issues, such as access to the roof terrace, whether lifting equipment is required, and rootball size. Design The design of the garden and its ambience were especially important. The roof garden is situated at the back of a block of shops and offices off High Street Kensington, and so didn’t have a view to incorporate. James dealt with this by giving the garden an enclosed feel. Most of the plants and materials had been specified at the design stage, and the palette consists of timber, green plants and some blasts of colour. The design incorporates lots of seating, including a large table for when

PROJECT DETAILS Project value £60k Build time Three weeks Size of project 110sq m

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2 the space is used for meetings, and more relaxed seating options for when the space is used for entertainment. Gardenlink advised on this and provided samples of products to the designer in the early stages. The planting stock is a predominantly evergreens, with seasonal herbaceous plants mixed throughout. This mixture gives the garden a full year’s worth of enjoyment and will be visually pleasing even on a dreary day. The design is complemented by the lighting scheme, which is a mixture of planter spike lights, uplighters and wall downlights. Build While the scheme looks complex, the process was straightforward, with the only logistical challenge being the delivery and receipt of the materials above ground level. The team had to take deliveries through the working office, but carefully liaised with the office manager, who praised the company for its professional, discreet and efficient service.

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PORTFOLIOS

ABOUT GARDENLINK Gardenlink is a unique company that offers a complete construction and planting service to designers. The company prides itself on the precontract advice given and the helpfulness of its operatives. Gardenlink carries out any size of design-led project in central London and the home counties. www.gardenlink.co.uk

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DURING WORKS

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1 A varied choice of planting and containers which help to enhance the scheme 2 The space accomodates both work and play 3 Brightly coloured planters complement the surroundings 4 A simple, comfortable seating area 5 Before commencement of works 6 Construction of the carcassing for the timber 7 Construction of the decking

REFERENCES Lighting and irrigation Landscape Plus www.landscapeplus.com

Plants Folia www.folia-europe.com

Trellis The Garden Trellis Company www.gardentrellis.co.uk

Soil Bourne Amenity www.bourneamenity.co.uk

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PROJECT DETAILS Project value £9.5m Build time 18 months total, five months for roof garden Size of project 1,300m2

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PORTFOLIOS

B R E AT H I N G SPACE RUDDING PARK HOTEL SPA ROOF GARDEN MAT THEW WILSON GARDENS

THE GOOD SPA GUIDE AWARDS 2017 Best Newcomer

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riefed by the client to create a landscape that formed a seamless extension of the spa experience, Matthew Wilson designed a garden that integrates features such as a rooftop sauna and spa bath as well as providing outdoor exercise space and areas for relaxation, casual dining and sunbathing. The spa building is a dynamic structure, partially cut into the landform to hide some of its scale. An important aspect of the design was to ensure the roof garden took full advantage of views into the surrounding estate and woodland

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gardens – views that vary as you move around the roof space. Matthew Wilson has worked with the owners of Rudding Park Hotel, Simon and Judi Mackaness, on a variety of projects spanning more than a decade. These projects have involved everything from landscaping a new accommodation wing to the creation of a one-acre walled kitchen garden. The estate has a long and rich horticultural history: in the late 18th century, Humphry Repton produced a Red Book for the thenowners, and the designer and plantsman James

Russell created several new garden areas in the post-war period. The Mackaness family has always been sensitive to this history, and is keen to create new garden areas and features that reflect the past while creating new narratives in the landscape – an ambition that the roof garden very much fits with. Design and plants The design was based around a central spine of linear beds, planted with an avenue of Amelanchier lamarkii multi-stems. Beneath these are Fagus sylvatica domes in varying

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sizes, punctuated with Stipa gigantea and large drifts of Miscanthus ‘Little Kitten’, Gaura lindheimeri ‘Whirling Butterflies’ and Salvia ‘Caradonna’. The central spine leads guests from inside the spa building to the various elements of the garden, including the spa bath, rooftop sauna and Pilates pit, and frames views to and from the dramatic glazed box that sits on top of the building. Around the Pilates pit is a glade-like planting of multi-stem Betula utilis var. jaquemontii, underplanted with Pittosporum tobira ‘Nanum’, Anemanthele lessoniana, and a variety of ferns and ground-covering geraniums. Fagus sylvatica and Taxus baccata hedges create a sense of enclosure around the roof garden’s perimeter and sub-divide elements of the landscape. Seasonal colour comes in the form of large swathes of alliums and narcissi, which are added to the garden over the spring and summer. Three feature Atelier Vierkant pots have been planted with Magnolia ‘Judy’ and are located on the artificial lawn to help create a permeable screen for the rooftop sauna. Materials Materials were sourced based on many requirements, such as resistance to wear and weather exposure, anti-slip characteristics, and suitability as part of the complex roof drainage structure. The paving is Schellevis cast concrete, and the paving set-out plan was carefully drawn so that only two cuts were required across the whole roof space. The decking material selected was Millboard in a light oak colouring. There is also a small lawned area comprised of artificial grass. The hard landscape elements of the design are floating over the drainage and insulation layers, either on a timber frame or on adjustable paving pedestals. Challenges Because of the cavity depth in some areas of the roof, the soil depth was inadequate for some plants. Raised beds were created using galvanised, powder-coated 5mm steel, and enabling the areas with a 200mm cavity to be increased to 400mm soil depth. Logistics were a challenge. Soil and materials were craned onto the roof, but the plants couldn’t be because the pad that the

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8 crane operated from had to be removed prior to their installation. Matthew and the team had to work out safe methods to bring the plants onto the roof and then into position, which he admits wasn’t easy on a busy building site.

ABOUT MAT THEW WILSON GARDENS Matthew Wilson is a garden designer, writer, radio and television broadcaster and lecturer. Prior to establishing his own practice, he was managing director and principal designer at Clifton Nurseries, and worked at the RHS. Matthew has designed award-winning gardens at the Chelsea Flower Show, including his 2016 garden for Welcome to Yorkshire, which won the People’s Choice Award. www.matthewwilsongardens.com

9 1 Lighting plays an important role in the space 2 Mature trees create an impressive backdrop 3 The central spine of planting 4 The roof space is divided into a series of ‘rooms’ 5 Quirky touches pick up on elements of the interior 6 Salvia ‘Caradonna’ – a vital summer component 7 The spa garden rooms create a series of glades 8 Making a connection with surroundings 9 Millboard decking and Schellevis paving 10 Planters help to break up large areas of deck

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PORTFOLIOS

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DURING PL ANTING

DURING PL ANTING

REFERENCES Paving Schellevis www.schellevis.nl Decking Millboard www.millboard.co.uk

DURING BUILD

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Plants Van den Berk Nurseries www.vdberk.co.uk Wykeham Mature Plants www.wykehammatureplants.co.uk Bonningdales Nurseries www.boningale.co.uk Johnsons of Whixley www.nurserymen.co.uk

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PORTFOLIOS PORTFOLIO

PROJECT DETAILS Project value More than £1.5m Build time Three to six months Size of project Over 1,000m2

PRINCIPAL AWARD Landscape Design Excellence 2015 (over £50k)

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LUXURY LIVING CHELSEA CREEK PENTHOUSE ROOF TERRACES ARALIA

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PORTFOLIOS

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ralia was commissioned by St George plc to create a series of seven luxury roof terraces for its penthouse apartments at Dockside House in Chelsea Creek, London. St George commissioned Aralia after seeing its contemporary roof terrace at RHS Chelsea Flower Show in 2012. The brief came at the height of the 2012 recession, so Aralia was charged with delivering world class designs that would ensure these penthouse apartments were highly desirable and would ideally sell quickly. Chelsea Creek is the pinnacle of sophisticated living, and the Penthouse Collection roof terraces, which feature contemporary exteriors, are one of London’s most elegant dockside developments. Aralia took inspiration from the architecture of the new apartments, and from the site’s proximity to the River Thames. A variety of natural materials were selected and blended carefully across a range of garden features, including green walls, water features, outdoor fire places and outdoor kitchens. Aralia’s design included bespoke Corten steel planters, commissioned sculptures and glass art, as well as hardwood decking, lighting, irrigation and planting. Teamwork Aralia worked as landscape architects within a multi-disciplinary consultant team that included architects, structural engineers, cost consultants and subcontractors. Aralia was

responsible from concept creation through to design detail. Ardmore was appointed as the overall contractor for the build, and appointed a range of subcontractors to carry out various elements of the build. Challenges The biggest challenge faced by Aralia was the need to work extremely quickly for a client who wanted everything done within a short timeframe. In addition, the overall envelope for the buildings themselves had to change during the project due to planning restrictions, which meant that a lot of redesign work had to be carried out in a short space of time. Accolades The Chelsea Creek Dockside Roof Terrace project went on to be awarded the 2015 BALI Landscape Design Excellence Award (Principal Winner) and was highly commended at the International Property Awards for Residential Landscape Architecture 2016, sponsored by The Telegraph.

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We are excited about the BALI Design Excellence Award, which is a mark of the high standard of design that Aralia has implemented at Chelsea Creek. Aralia has created terraces which are the epitome of innovation and luxury, as part of our Penthouse Collection. With the penthouses due for completion in the coming months, it’s great to see that the designs are creating such a well-deserved buzz for their high standard and creativity MICHAEL BRYN-JONES, MANAGING DIRECTOR, ST GEORGE PLC

ABOUT ARALIA

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Having studied Landscape and Garden Design at Writtle College, Patricia Fox set up Aralia in 2004 and has built a design studio ethos where creativity and excellence are paramount. Aralia has two Silver medals from RHS Chelsea and is a multiple winner of the BALI Landscape Design Excellence Award. The team works on a range of commissions, from urban gardens to commercial landscapes. www.aralia.org.uk

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PORTFOLIOS PORTFOLIO

1 Hardwood runway deck with inlaid glass panels and bespoke art panels ©John Glover 2016 2 Visualisation for outdoor lounge space with topiarised trees ©St George plc 2016 3 Hardwood slatted Ipe pergola ©Aralia 2016 4 Visualisation for 26th floor penthouse with glass panelling set into stone paving and sculptural columnar yew features ©St George plc 2016 5 Bespoke water feature with pebble tray at bottom to contain and recycle water ©John Glover 2016 6 Long view down with bespoke water feature on left and Corten planters ©John Glover 2016 7 Seventh floor terrace with water feature, Corten planters and Taxus topiary ©John Glover 2016

REFERENCES Hard landscaping contractors Blakedown Landscapes www.blakedown.co.uk Elite Landscapes www.elitelandscapes.co.uk

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BEFORE

Paving and stone CED Group www.cedstone.com Trees Deepdale Trees www.deepdale-trees.co.uk Plants Robin Tacchi plants www.robintacchiplants.com

DURING WORKS

Lighting design Aralia www.aralia.org.uk Light IQ www.lightiq.com Green walls ANS Group Europe www.ansgroupglobal.com Timber pergola The Garden Trellis Company www.gardentrellis.co.uk

Corten planters Kinley Systems www.kinley.co.uk Outdoor kitchens Fire Magic www.fire-magic.co.uk Outdoor fireplaces Urban Fires www.urbanfires.co.uk Glass art Leyla Murr www.leylamurr.com Sculpture Neil Barab www.nealbarab.com Steinworks www.steinworks.co.uk Petal Pod www.petalpod.co.uk Jane Bohane www.janebohane.com Awning Superior Awning www.superiorawning.com

Metal louvre pergolas Biossun www.biossun.com

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Inspiring beautiful landscapes

Wednesday House (Ware Country Garden) Design & Build: Aralia Products: Yellow Paddlestones

+44(0)1708 867 237 enquiries @cedstone.co.uk www.cedstone.co.uk

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ADVICE PORTFOLIO

SOIL SELECTION

ONE TOWER BRIDGE COMMUNAL GARDEN – SCOTSCAPE

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ADVICE JONATHAN BOURNE, DIRECTOR OF BOURNE A M E N I T Y, E X P L A I N S HOW THE COMPANY BLENDS THE PERFECT SOIL FOR PODIUM LANDSCAPES

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ourne Amenity was first enlisted to blend a soil for podium planting back in 2007. We were challenged to come up with a lightweight solution to help reduce the load burdening, while maintaining the topsoil’s structural and nutritional integrity. The usual field bulk density of our topsoils is around 1,300kg per m³, and this had to be reduced to a working density below 1,000kg per m³. However, we didn’t see our first official specification for a podium planting medium until 2012. Podiums differ from roof gardens, as they don’t often have the depth of materials available due to the way they’re engineered. They are usually car park roofs and haven’t been designed to take volumes of materials, or don’t have set drainage systems installed ready for the landscapers to finish the work. The trend has changed over recent years and we now see a greater need for greening large house builds, specifically in cities; it’s now taken into account at the design stage, allowing for better living environments and better designed drainage systems to ensure longevity. Podium soils, where load-bearing and drainage are primary concerns, are becoming popular among those designing urban schemes that need to comply with SuDS requirements as well as satisfy demands for more green spaces in densely populated areas. We have seen projects, such as Thomas Heatherwick’s 1,000 Trees scheme in Shanghai, which look to make the most of urban space with an abundance of living roofs and walls. Space is at a premium, so designers are looking for innovative ways to reproduce full planting schemes with limited space and weight demands. To make a naturally heavy, sandy soil more lightweight, we experimented with various materials that have the desired effect without compromising the availability of nutrients, or the integrity of the soil’s drainage capability. When

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blending soils, you must find a natural balance that suits the planting scheme and does not result in a material that has zero water retention and ends up drying out. There are various options available, from expanded clay pellets to crushed brick, and at Bourne Amenity we utilise both across our range of lightweight materials, for planting on podiums as well as rooftops. By using single-size sands and materials, such as Lightweight Expanded Clay Aggregate, you can reduce the topsoil compaction that usually accompanies the installation of these materials on congested inner-city projects. The sand and the Lightweight Expanded Clay Aggregate opens the soil profile and allows for water and air to pass more freely throughout the soil layer, creating a healthier environment for plants and shrubs. The blending ratio is key to maintaining the correct drainage-to-nutrient balance, and it’s crucial that soils perform across drainage and nutritional indicators, as well as bulk density. Ideally the dry weight of your podium soil needs to be as low as possible, without compromising the structure or growing performance of the topsoil. Aim for around 800-850kg per m³ when

KING’S CROSS – WILLERBY LANDSCAPES

the soil is bone dry. This will increase upon saturation, but manufacturers should aim for their material not to rise above 1,200kg per m³ when fully saturated. If the scheme is effective, then the material should never reach full saturation, but it is important to include the saturation figure in your analysis.

ABOUT BOURNE AMENIT Y Bourne Amenity has been supplying hard and soft landscaping materials to the industry for over 40 years, working with civil engineering companies, landscape designers and contractors. www.bourneamenity.co.uk

CANARY WHARF CROSSRAIL – BL AKEDOWN L ANDSCAPES

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ADVICE PORTFOLIO

THE RIGHT PLANTS WITH THEIR LIMITED SPACE AND CHALLENGING CONDITIONS, PODIUM LANDSCAPES CAN PRESENT D I F F I C U LT Y W H E N I T C O M E S TO PLANT SELECTION. EXPERIENCED PLANT BUYERS AND NURSERY MANAGERS GIVE US THEIR TOP PODIUM PLANT PICKS

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ooftops are often challenging places in which to make gardens; they tend to be small, dry and windy, with poor hosepipe access, nowhere for waste to go and limited soil depth,” says Robert Richardson, plant centre manager at Johnsons of Whixley. “A gardener’s focus should be selecting low-maintenance, drought-tolerant plants that are interesting through the seasons, or that die back completely when flowering is done to allow other plants to shine.” Plants need to be hardy enough to cope with adverse weather conditions and UV exposure, while creating impact in terms of design. Charles Carr, head of wholesale nurseries at Hillier, recommends a focus on container gardening: “Use plants that are compact and sturdy, with a long season of interest to maximise their appeal and impact.” He suggests that shrubs can be used for structure, screening and to provide shelter, while herbaceous perennials can add a splash of colour.

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PIT TOSPORUM TENUIFOLIUM ‘ VARIEGATUM’

HILLIER HEUCHERA ‘SPELLBOUND’

PHOTINIA ‘LIT TLE RED ROBIN’

CHOISYA ‘WHITE DAZZLER’

CHARLES CARR, HEAD OF WHOLESALE NURSERIES Choisya ‘White Dazzler’ has a long flowering period in autumn and spring, displaying scented flowers. It also responds well to trimming to shape. Photinia ‘Little Red Robin’ has a robust habit and deep red new growth. It could be used as screening or a windbreak for an exposed area. Pittosporum comes in a range of colours and sizes, from the compact, mound forming ‘Tom Thumb’ and ‘Golf Ball’ to taller varieties such as ‘Tandara Gold’ or ‘Elizabeth’. Rosmarinus has scented foliage and attractive flowers, and is useful to add flavour to a Sunday roast. It thrives in a dry exposed spot in full sun, and is excellent in a container.

Grasses can add both colour and movement to a garden, from the statuesque Miscanthus to smaller types such as Carex and Hakonechloa. Salvia greggii ‘Blue Note’ has aromatic foliage and flowers from June into the first frosts; if they get too big they can be sheared back, rapidly coming back into flower. Heuchera is always a winner in a container garden, adding evergreen foliage and colour to suit every palette. Compact varieties such as Rhodanthemum ‘Marrakech’ or ‘Casablanca’ are superb in a pot, and flower all summer. Their silver foliage makes them drought tolerant, and they thrive in sunshine.

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ADVICE

MAT T MAYHEW, HEAD BUYER

VERBENA BONARIENSIS ‘LOLLIPOP’

CREEPERS STIPA TENUISSIMA

TRACHELOSPERMUM JASMINOIDES

OSMANTHUS X BURKWOODII

ROBERT RICHARDSON, PLANT CENTRE MANAGER Trachycarpus fortunei is one of few palms that are tolerant of British winters, and lends itself to contemporary or tropical-themed gardens. Rhus typhina has fiery autumn colour, distinctive red fruit and velvet-covered stems. Tolerant of poor soil and drought, it will often survive where other shrubs or trees won’t. A Crocosmia ‘Lucifer’ adds height and colour to a border late into the season. Easy to plant and easy to look after, Crocosmia are perfectly suited to the shallow dry soils often used in roof gardens. Allium ‘Purple Sensation’ make great rooftop garden plants. They often have limited requirements for water and are naturally adapted to shallow soils. They work well mixed in among grasses in steppe-type plantings.

ALLIUM ‘PURPLE SENSATION’

STIPA TENUISSIMA ‘PONY TAILS’

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RHUS T YPHINA

JOHNSONS OF WHIXLEY

MISCANTHUS SINENSIS ‘RED CHIEF’

ERIGERON KARVINSKIANUS

A low-maintenance evergreen climber such as Trachelospermum jasminoides takes full sun or partial shade. It prefers a sheltered location, and flowers from mid to late summer. Verbena bonariensis ‘Lollipop’ can be used as an annual, perennial or subshrub. It does well in full sun, sheltered or exposed positions, and looks beautiful among shorter grasses. Osmanthus x burkwoodii is a naturally rounded evergreen shrub that flowers in mid and late spring. It’s happy in a shaded corner of the garden and can be clipped in topiary forms. A soft grass such as Stipa tenuissima can be used in an exposed or sheltered full sun position, and moves gracefully in a breeze.

GLENDALE

VERBENA BONARIENSIS ‘LOLLIPOP’

CROCOSMIA ‘LUCIFER’ CROCOSMIA ‘LUCIFER’

LORRAINE HARTLEY, AMENIT Y SALES Embrace the elements with a Stipa tenuissima, which flows beautifully in the breeze, creating a shimmering silver carpet when planted en masse. Delicate petals and pretty blossoms won’t fare too well, but there’s certainly a place in any rooftop garden for the more robust-stemmed, drought-tolerant flowering perennial, such as the Verbena bonariensis ‘Lollipop’. It offers colour, a long flowering season and strong wiry stems that other, more delicate plants can weave their way through. Raised rooftop planters often need softening with trailing plants. Erigeron karvinskianus adds a delicate touch, as well as a landing pad and feeding station for passing bees. Feather grasses such as Miscanthus sinensis ‘Red Chief’ work well on podiums, as they develop autumnal colours when exposed to the elements. They add height without obscuring your skyline, and offer a rich colour that captures the evening sunset beautifully.

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ADVICE

SOLID F O U N DAT I O N S KARL HARRISON, TECHNICAL DIRECTOR AT EXTERIOR SOLUTIONS, TALKS THROUGH THE PROCESS OF CHOOSING DECKING AND SUB-FRAMES FOR PODIUM LANDSCAPES

KEBONY EXTERPARK MAGNET DECKING

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o, the architect has designed a building with a roof or balcony and the structural engineer has calculated the building structure, ready for the garden designer to design the decking. Two things need to be considered here: the roof or balcony structure must be designed to take the layout of the decking, and the decking structure must be compatible with the roof structure. Whatever you design, you need it signed off by a structural engineer. It’s not a huge issue, but something to consider. Decking structural buildup The most common decking buildup you will find is a pedestal layout with a joist arrangement on top of it, with the decking fixed to that. Pedestals don’t have to be that complicated and are available from many manufacturers – most of which will try to convince you that theirs is the best, as it will take hundreds of kilograms. Think critically here: if you assume 6.5 pedestals per m², why would you need your pedestal to support such a huge weight? If each pedestal can support, say, 800kg, and you multiply this by 6.5 (the number of pedestals

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ADVICE PORTFOLIO

per m²), you have 5.2 tonnes – a number that far exceeds any normal or abnormal loads. There is little chance that the roof structure would take this. Ask the structural engineer for advice on the maximum load required to be taken by each of the pedestals – this could save you a fortune. The joists can be made from many materials – softwood or hardwood, aluminium, composite or plastic. In most cases, they’re specified by the manufacturer of decking that you’re using. Types of pedestal and how they interface with the roof membrane There are a whole host of manufacturers, all boasting their own benefits. As long as they are CE-marked and come in the dimensions you require, I can’t comment on any discernable benefits in choosing one over the other. The pedestal is not usually fixed in place by mechanical means, and it is not recommended to fix the pedestals to the roof with an adhesive. Most roofing membranes do not allow adhesive and instead recommend an additional layer of membrane; without this, you would invalidate the warranty. While I prefer fixed head with adjustable height pedestals, I have nothing against the flexible head styles that allow for self-leveling and can be used on a gradient without having to level the base. Types of decking substructure Since decking came to the UK, treated timber joists have been used for most installations. There is nothing wrong with this if they are treated in accordance with EN 335:2013 Use Class 3, which is usually warranted against rotting for 10 years. That’s not to suggest this timber has a lifespan of only 10 years – this is merely the warranty against rotting. I would suggest that a structurally graded timber that is out of the ground and treated to Use Class 3 will last for 25 years or so in that situation. If you have to use timber for an extended period, or have to conform with the NHBC 60 Year Code of Practice, which requires a service life of 60 years, I would suggest using Accoya. This has a structural grading of C22; if you use the calculations for C18, you would be well

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EXTERPARK IS A COMPLETE DECKING SYSTEM

within regulations, and have a structure that will be warranted against rotting for 50 years. An alternative joist system that is being used more and more is aluminium, usually in a specific or patented profile to suit individual decking types – for example Exterpark Magnet. There are also HDPE plastic joists and composite joists. Plastic would be lowest on my list due to its limited lifespan and the awkwardness involved in fixing it. Fixing techniques When it comes to fixing, stick to what the manufacturer says, listen to what they advise and always use the installation instructions. Failure to do this is the main cause of the issues that I attend. The deck, for the better part, looks great, but where the contractor seemed to know best is usually where the failure is – incorrect joist spans, own choice of screws,

wrong gaps, no falls. I have seen these so many times. Decking options There are too many variables for me to be able to suggest which is the best decking for a roof garden or podium landscape. Hardwood decking lasts for 30 years or so, and can look its best after 10 years if well maintained. Accoya timber decking lasts the longest, being warranted for 50 years. Wood Plastic Composite (WPC) products such as ecodek, Exterpark, or UPM ProFi are good options with good warranties, while non-WPC composite decking, such as Millboard, is now a decking mainstay – it’s a good in-between, with great warranties. Softwood is dying a slow death and is generally used for budget DIY projects; if budgets are tight, I always suggest Siberian Larch, painted with an Owatrol decking paint.

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15/02/2018 09:51


PRODUCTS

L AT E S T PRODUCTS FOR PODIUM LANDSCAPES

EMPEROR PORCELAIN PAVING PRICE: POA

BOULEVARD DELTA 60 CUBE PRICE: £339

CED STONE GROUP

IOTA GARDEN

Emperor is a unique range of high-strength, high-quality porcelain paving, designed to inspire beautiful outdoor spaces. Lightweight and thin, it’s the perfect material for laying on pedestals in raised areas and podiums. www.cedstone.com

Large, strong and yet under 30kg, this planter is ideal for use in weight-restricted areas. Boulevard planters are made from a dense, highly compressed fibre-cement, and are available in a wide range of shapes and sizes. Shown in Anthracite; can be custom coloured. www.iotagarden.com

HT EVOLUTION PRICE: £27 PER M 2

EXTERPARK MAGNET DECKING PRICE: FROM £65 PER M 2

HI-TECH TURF

EXTERIOR DECKING

HT Evolution is perfect for podiums as it’s hardwearing and does not require a sand infill. The product looks great and will withstand continued exposure to the elements, as well as standing up to heavy foot traffic if roof space is used in a commercial setting. www.hitechturf.co.uk

The fastest high-end decking system to install, with no trap doors required for maintenance as it is fully accessible. By using Exterpark Magnet decking you can achieve a complete structure on as little as 43mm. Available in composite or in Accoya Kebony Teak Ipe and Iroko. www.exteriordecking.co.uk

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PRODUCTS PORTFOLIO

©Paul Newman Landscapes

L AT E S T P R O D U C T S

AQUA MAGIC SYSTEM PRICE: £84.99

OUTDOOR LED STRIP LIGHT 5M PRICE: £44

CL ABER

LIGHTING FOR GARDENS LTD

Aqua Magic is indispensable irrigation solution, offering those who don’t have access to mains water or electricity a solution that will give them the advantages of drip irrigation – potentially revolutionising the way people irrigate rooftop and balcony gardens. www.claber.co.uk

MicroLED light strips provide flexible, linear lighting solutions for modern garden lighting schemes. Applications include lighting under steps, seating and balustrades, and outlining water features, building and garden structures. They are also fantastic as LED deck lights. www.lightingforgardens.com

ENHANCED GRAIN IN GOLDEN OAK PRICE: £78 PER M 2

INTENSIVE ROOF SUBSTRATE PRICE: £65-£75 PER M³

MILLBOARD

BOURNE AMENIT Y

Enhanced Grain in Golden Oak looks like real oak but, with no wood content, it offers far superior resistance to the effects of rain and sun, making it ideal for rooftop locations. Installation on pedestals is straightforward and assists in achieving a level surface on a sloped roof. www.millboard.co.uk

This intensive lightweight topsoil was developed to tackle the issue of the saturation weight of soil in podium planting. Bourne Amenity created a blend that would satisfy the bulk density specification limits while maintaining the quality of its blended BS3882 multipurpose topsoil. www.bourneamenity.co.uk

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IT’S NOT JUST A TREE

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