Polygonum bistorta is a PERENNIAL growing to 0.5 m (1ft 8in) by 0.5 m (1ft 8in).
It is hardy to zone 4. It is in flower from Jun to September, and the seeds ripen from Aug to October. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: acid, neutral and basic (alkaline) soils and can grow in very acid soils.
It can grow in semi-shade (light woodland) or no shade. It prefers moist or wet soil.