Polygonum polymorphum
Smartweed, Giant Fleeceflower, Knotweed
Family: Polygonaceae Buckwheat
| Type | Perennial |
| USDA Hardiness range | 4A - 9A |
| Exposure | Partial shade to full sun |
| Bloom color | White |
| Water needs | Moist |
| Landscape uses | Border, foundation, rock garden, specimen |
| Height | 24" to 36" / 60cm to 90cm |
| Spread | 24" to 30" / 60cm to 75cm |
| Growth rate | Moderate |
| Bloom attributes | Suitable for cut flowers, suitable for dried flowers, fragrant flowers |
| Leaf color | Green |
| Fruit color | n/a |
| Soil pH requirements | Neutral |
| Soil type | Sandy, loamy |
| Form | Upright or erect |