Persicaria amphibia (Water knotweed)
Other names: Polygonum amphibium, Water smartweed, Amphibious bistort, Amphibious knot grass, Floating polygonum, Ground willow, Heart's ease, Water buckwheat, Water willow, Willow grass
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Species
P. amphibia is a variable, vigorous, moisture-loving or aquatic, rhizomatous perennial with long, usually lance-shaped, mid- to dark green leaves and, from midsummer into autumn, erect stems bearing dense, terminal clusters of five-petalled, pink flowers followed by glossy, brown fruit.
Season of interest
Flower | ||||
|---|---|---|---|---|
| Spring | Summer | Autumn | Winter | |
| Flower | ||||
Foliage | ||||
| Spring | Summer | Autumn | Winter | |
| Foliage | ||||
Height and spread
Height and spread | |||
|---|---|---|---|
| Size | Max height | Max spread | To maturity |
| 0.3 m | 2 m | 2-5 years | |
| 0 ft | 6 ft | 2-5 years | |
Where to grow
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