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A picture of a Knotweed

Knotweed

Persicaria affinis

Partial Shade
Moderate watering
Frost Hardy

8a

USDA zone

-12°C

Minimum temperature

Expected size

Height
Spread

35cm

Max

60cm

20cm

Min

40cm

Flowering

  • spring
  • summer
  • autumn
  • winter

Knotweed Overview

This species is a low growing mat-forming perennial which will grow to about 25cm. The leaves are elliptic to oblanceolate 3-10cm and basal, they are dark green turning bronze-red in the autumn. The flowers are borne in dense upright spikes of pink-red blooms in late summer to medium autumn.

How to propagate Knotweed

Division

Divide clumps in autumn or spring.

Other uses of Knotweed

Ground cover, walls, rock garden, borders