Reynoutria sachalinensis (Giant knotweed)

Cultivation

An highly invasive species in the majority of introduced areas, including the UK, mainland Europe, North America, and part of Oceania. It is prohibited to grow this plant in many areas of the US. Where permitted, grow in moist or moist but well-drained soil in full sun or light shade. Site carefully as it will quicky colonise, overpowering nearby plants. To avoid spread, grow within a barrier buried deep in the soil.

Suggested uses

Ground Cover, Waterside

UK hardiness

H7

USDA zones

Zone 4, Zone 5, Zone 6, Zone 7, Zone 8

Sunset zone

WUCOLS

North-Central Coastal = Unknown
Central Valley = Unknown
South Coastal = Unknown
South Inland = Unknown
High and Intermediate Desert = Unknown
Low Desert = Unknown

Foliage

Deciduous

Habit

Spreading

Native to

Japan, Korea

Drought tolerant

No

Flood tolerant

No

Toxicity

May cause skin photosensitivity if touched.