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botanical name:
Persicaria wallichii
Persicaria wallichii © Deeproot Plant Base
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common name:  Himalayan Knotweed
synonyms:  Polygonum polystachya, Polygonum polystachyum
family:  Polygonaceae
characteristics: perennial, scented/aromatic
height: 1.80m
width: 1.50m
growth rate: fast
growth habit: clump
leaf colour: green
flower colour: white
stem/bark: red & green
main season: Summer
aspect: full sun, part shade
conditions: moist soil, wet/waterlogged soil, clay soil, sandy soil
preferred soil pH: any
minimum temp: -23°C
USDA zone: 6 to 10
Very vigorous, large shrub-like rhizomatous perennial that can spread to cover large areas. Reddish stems and alternate lanceolate mid-green leaves from 10 to 20cm long. Large strongly scented heads of white flowers in late summer and autumn.

Does best in moist fertile soil in sun or part shade, but tough and adaptable.
May become invasive.

From seed or by division.

other notes:
From the Himalayas area, naturalized elsewhere including parts of South-west Britain.
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