Waterlilies, if left unchecked, can and will multiply by both seeds and rhizomes. They can take over any body of water.
enough to choke any waterway if not controlled. Fortunately, the plant is a favorite of koi. It can grow in our area at a rate of up to 2 feet per week! Horsetail reed (Equisetum hyemale) grows long, green, vertical, hollow stems with rough, black bands about every 2 inches, indicating the joint. They multiply by producing spores and creating long runners underneath the soil that can grow under or around concreted areas, producing new stalks as it goes. It can thrive in small spaces and is very popular in Asian-inspired designs. This
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plant can withstand most winters and has been found across North America. Parrot’s feather (Myriophyllum aquaticum) grows long vines that are covered in tiny, green, feather-like leaves. It can grow up to 2 feet above the water level and will spread as far as it can. It has been known to smother out other plant life by blocking sunlight and causing oxygen and nutrient depletion in waterways. It can also clog up streams and other waterways with its dense foliage. They multiply from its perennial rhizome or from segments of the plant that have
been cut off, so trimming the plant back will actually cause new plant growth. It tolerates most herbicides and thrives in nutrient-rich, warm water. This plant is most often found in the southern United States, but it has been found as far north as Massachusetts. Pickerel rush (Pontederia cordata) has long, green stems surrounded by green, shiny leaves that reach up to 6 feet tall. It produces a cone flower that has many small, purple blooms. They multiply by perennial rhizomes and seeds dispersed into the surrounding
Parrot's Feather
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