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Persicaria amphibia

Water Knotweed (Longroot Smartweed, Water Smartweed, Willow Grass)

An aquatic plant found in shallow waters along, lakes, ponds and ditches. The pink, spiky, flower clusters rise above the green foliage and long stems which may creep, float or grow erect before rooting at the stem nodes.

  • »  AKA Polygonum amphibium
  • »  Habitat includes shallow waters along lakes, ponds, ditches
  • »  Adaptable to short periods of drought
  • »  Long stems may creep, float or grow erect, before rooting at the stem nodes
  • »  Leaves can be lance-shaped or take various other shapes
  • »  Can grow in water depths up to 2.5 meters or less
  • »  Pink, spiky, flower clusters
  • »  Bloom Time: June to September

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  • Category:Perennials
  • Hardiness Zone:4
  • Height:30-125 cm
  • Spread:0-0 cm
  • Bloom Color: Pink
Exposure
Full Sun
Partial Sun/Shade
Growth Rate
Fast
Critter
Deer Resistant
Attributes
Native to Ontario
Foliage Color
Green
Landscape uses
Bog or water garden
Naturalizing
Additional Information about Persicaria amphibia

Native to Ontario
 

"Persica" is a latin word meaning "peach" and "aria" means pertaining to, which is referring to the similarity of the leaves. 

Growing & Maintenance Tips for Persicaria amphibia

Persicaria amphibia are adaptable to various levels of water, including the ability to survive short periods of drought. They are suitable for naturalizing in storm sewer ponds and runoff ditches where water availability is inconsistent. Both terrestrial and aquatic versions may take on very different appearances.