tcm (r&d) : Dwarf knotweed
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Dwarf knotweed
Fallopia japonica var. compacta
Species
Fallopia japonica var. compacta; a variable species of which former
names have included: Polygonum pictum, Polygonum compactum and
Polygonum reynoutria.
Family
Polygonaceae
Description
Dwarf Japanese Knotweed is a hardy, herbaceous, rhizomatous
perennial. Plants are mainly dioecious and functionally female
(male-sterile): though some are monoecious, with both male-fertile and
functionally female (male-sterile) flowers. Stems grow to 1 metre,
reddish. Leaves are proportionally smaller, dark green suborbicular,
bases truncate, margins crimped. Flowers reside in dense upright
panicles, growing to 6cm long, and are often pink in male-sterile
individuals. The fruits are similar to other Knotweeds.
General Information
Plants known as Fallopia japonica var. compacta are alpine variants
of Fallopia japonica, introduced to the UK for garden use. Populations
are of variable height, and with the amounts of red pigmentation on
stems, flowers and seed heads, likewise varying. Though invasive in a
garden context, it has not gained important pest status.
Fallopia japonica var. compacta can also hybridise with Fallopia sachalinensis to produce a strain of Fallopia x bohemica.
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