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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
description:
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.

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

propagation:
From seed or by division.

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

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