Scientific Name
Polygonum spp.
Common Name
Knotweed

Season

late summer to early fall

Height

6-24 inches

Hardiness

USDA Hardiness Zone 4-7 or 8

Flower Color

pink, rose red, white

Soil

moist soil

Exposure

full sun

Propagation

division spring or fall

North Carolina Regions

Mountains, Piedmont, Coastal Plain

Comments

About 150 species of Knotweed or Smartweed are known, and most are weeds of disturbed, moist areas. In the garden species and hybrids of Polygonum are interesting and beautiful with a long bloom season and compact or spreading growth forms.

Origin

USA, Europe, Asia, hybrid origin