Ampelopsis japonica aka Japanese Peppervine

Ampelopsis japonica is a deciduous vine in the grape family, Vitaceae. Its native range spans the southern Russian Far East, northern Korea and China. It grows in temperate parts of this region. Wild plants climb through trees and shrubs on hillsides. They also grow in thickets, grasslands and mountain sites. Recorded habitats lie at 328–2,953 feet [100–900 metres] above sea level.

This climber can reach about 33 feet [10 metres] tall. Give its roots plenty of space to spread. Reports differ on how its shoots attach to supports. One describes sticky pads that hold the shoots against walls. Another describes coiling tendrils and notes that large plants need ties. These help supports carry the weight of the leaves. A sheltered wall or woodland garden offers a possible planting site.

Flowers appear from July to August, and insects pollinate them. Each plant bears both male and female flowers. Seeds ripen from September to October where fruit develops. In Britain, plants seldom set fruit without a long, hot summer. This makes fruiting less reliable than flowering in that climate. The supplied species evidence gives no further flower or fruit details.

Choose deep, rich loam that stays moist. The plant grows in full sun or partial shade. It accepts mildly acid, neutral and mildly alkaline soil. A warm site with shelter suits its needs. PFAF lists it for USDA zones 6–9. Yet new spring shoots can suffer frost damage, even on mature plants. A site shielded from early morning sun may help protect this growth. Hardiness of the established plant does not mean new shoots resist frost.

Seeds and cuttings offer ways to raise new plants. Sow seed in autumn pots within a cold frame. Spring sowing follows six weeks of cold treatment at 41°F [5°C]. Germination may take more than a year. Keep seedlings under glass through their first winter. Plant them out after the last expected frost. Half-ripe cuttings can be taken in July or August. PFAF records medicinal use of the roots and occasional medicinal cultivation in Japan. These records do not establish safe home use. It lists no known food uses or hazards. That lack of reported hazards does not prove the plant is safe to eat.