white dragon knotweed

Persicaria polymorpha (white dragon knotweed) is a shrubby, clump-forming perennial featuring plumes (panicle racemes) of creamy white flowers reminiscent of goat’s beard (Aruncus dioecus).

Its astilbe-like white plumes are popular with butterflies and attractive seed heads that invite birds. Synonymous with and sometimes sold as Polygonum polymorphism. and is native to China and Japan. This knotweed is not invasive and can grow as big as 6 feet tall.

Botanical Name Persicaria polymorpha
Common Name white dragon knotweed
Family Polygonaceae
USDA Zone 4 thru 9
Light Requirement Full Sun to Part Shade
Season(s) of interest spring, summer, fall, winter
Height and Spread 3-6ft x 3-4ft (90-180cm x 90-120cm)
Flower Color White
Attracts Wildlife Rarely Browsed by Mammalian Herbivores
Additional Information Not Native to the US Midwest. Native range: Asia.
Location in Lurie Garden Southwest Dark Plate, North Dark Plate

Average Flowering Time