WSU Clark County Extension

PNW Plants Searchable, categorized images

Giant Fleece Flower

Scientific name: Persicaria polymorpha

Type:Herbaceous perennials
Plant Requirements
Zone:5 to 9
Sun:Full to partial sun
Plant Characteristics
Height:5 ft
Width:5 ft
Bloom:Summer flowers
Bloom Time:May to September
Bloom Color:White
Additional Characteristics



Wildlife value

Description With its robust summer growth and masses of fluffy white blooms, Giant Fleece Flower makes a welcome addition to the back of a flower bed.

This herbaceous perennial grows to 5’ tall and as wide. It is a clump forming plant with lance-shaped dark green leaves. Unlike other members of the knotweed family, this species is not considered invasive.

Blooms consist of 5”-7” long creamy white, astilbe-like bouquets arranged in panacled racemes appearing over the summer from late May through September. As the flowers fade they take on a pink color and then reddish brown as the season ends. Butterflies are attracted to the flowers, while birds feast on the seed heads in the fall.

This plant does best in moist fertile soil with either full or partial sun. It deserves protection from strong winds. It is considered to be a drought tolerant perennial once fully established. It is tolerant of wet sites so it is well-suited to waterside plantings.

No serious insect or disease problems.
For assistance, contact Dr. Charles Brun (, (360) 397-6060 5701
Computing and Web Resources, PO Box 6234, Washington State University, Pullman WA 99164-6234