Polygonum amplexicaule 'Speciosa (Firetail)'
Mountain Fleece, Knotweed, Smartweed
Family: Polygonaceae Buckwheat
| Type | Perennial |
| USDA Hardiness range | 4A - 8A |
| Exposure | Partial shade to full sun |
| Bloom color | Red |
| Bloom time | Early Summer to Mid Fall |
| Water needs | Moist |
| Landscape uses | Border, ground cover, massing, rock garden |
| Height | 36" to 4' / 90cm to 1.20m |
| 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 |