Asiatic tearthumb (Polygonum perfoliatum)

At a glance

Lifecycle: Annual
Exposure: Full sun

Cultivation

We have very little information on this species and do not know if it is hardy in Britain, though judging by its native range it should succeed outdoors in most parts of the country. We are not sure if it is a perennial or annual. The following notes are based on the general needs of the genus. Succeeds in an ordinary garden soil. Plants seem to be immune to the predations of rabbits.

Propagation

Seed - sow spring in a cold frame. Germination is usually free and easy. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in the summer if they have reached sufficient size. If not, overwinter them in a cold frame and plant them out the following spring after the last expected frosts.

Edible uses

Tender young leaves and shoots - raw or cooked. Used as a vegetable. Seed - raw or cooked. It is rather small and fiddly to utilize. The ripe fruits (seeds) are eaten fresh, especially by children.

Medicinal uses

The whole plant is depurative, diuretic and febrifuge. It is also used to stimulate blood circulation. The juice of the leaves is used in the treatment of backaches.

Habitat

Wet thickets and by rivers in lowland all over Japan.

Native range

E. Asia - China, Japan, Korea, India.

Scientific synonyms Persicaria perfoliata