Polygonum amplexicaule
Mountain Fleece, Knotweed, Smartweed
Family: Polygonaceae Buckwheat
| Type | Perennial |
| USDA Hardiness range | 5B - 9A |
| Exposure | Full sun |
| Bloom color | Pink, purple, red, white |
| Bloom time | Mid Summer to Late Fall |
| Water needs | Moist |
| Landscape uses | Border, ground cover, rock garden |
| Height | 24" to 5' / 60cm to 1.60m |
| Spread | n/a |
| Growth rate | Fast |
| Leaf color | Green |
| Fruit color | n/a |
| Soil pH requirements | Neutral |
| Soil type | Sandy, loamy |
| Form | Upright or erect |
| Attributes and features | Attractive foilage, naturalizing |