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
