Thunbergii Knotweed (Polygonum thunbergii)

Family: Polygonaceae | Edibility: Edible (1/5)

Polygonum thunbergii is a ANNUAL growing to 1 m (3ft 3in). It is in flower from July to September, and the seeds ripen from August to October. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade.

Edible Parts & Harvest Seasons

Edible Parts: Nuts/Seeds, Leaves

Harvest Seasons: Fall, Late Summer

Flavor & Culinary Uses

Young plant - cooked. Seed - raw or cooked. It is rather small and fiddly to utilize. — Young plant - cooked.; Seed - raw or cooked.; It is rather small and fiddly to utilize.

Habitat & North American Range

Wet grassy places in lowland and mountains all over Japan. (Zone 4, Zone 5, Zone 6, Zone 7, Zone 8)