Persicaria polymorpha – Giant Fleece Flower Persicaria polymorpha, also known as Giant Fleece Flower or White Dragon Knotweed, is a truly majestic perennial that brings architectural elegance and enduring charm to spacious garden settings. In mid to late summer, it produces towering plumes of creamy white flowerspanicle racemes reminiscent of goats beard (Aruncus dioicus)that hover above a lush mound of dark green, lance-shaped foliage. 1 Bare Root Dramatic creamy-white flower plumes (midlate summer) Low-maintenance; remove spent blooms to encourage rebloom; may self-support but might flop slightly in raineasily rebounds Heat-, humidity-, drought-, and deer-tolerant; no serious pests or invasiveness concerns Specifications Details Foliage Colour Deep green, lance-shaped leaves Hardiness Zone 3 – 9 Plant Height 3 to 6ft (90180cm) tall Plant Width 3 to 6ft (90180cm) spread Sun Requirements Full sun to partial shade Fragrant No Deer Resistant Yes Plant Timing Spring or fall planting in moist, well-drained soil Bloom Timing June – September Plant Depth Crown at soil level Plant Spacing 3648in (90120cm) apart recommended