Polygonum affine (Knotgrass)
Botanical Information
| Family | Polygonaceae |
| Genus | Polygonum |
| Species | affine |
| Synonyms | Persicaria affinis |
| Category | Perennials |
| Origin | Native to the Himalaya region. |
Details
| USDA Hardiness Zone | 6 |
| USDA Hardiness Ref. | |
| Canadian Hardiness Zone | 6a - 6b |
| Canada Hardiness Ref. | |
| RHS Hardiness Zone | H7 |
| RHS Hardiness Ref. | |
| Temperature (°C) | Greater than -20 |
| Temperature (°F) | Greater than 4 |
| Height | 0.1 - 0.5 m |
| Spread | 0.5 - 1 m |
| Growth | Medium |
| Flowering Period | January, July, August, September, October, November, December |
Description and Growing Information
| General Description | An herbaceous perennial with elliptical leaves that transition from dark green through multiple tones of red, yellow, and bronze during the autumn. Flowers bloom in lance-like clusters, opening up as bright red/pink in midsummer and turn brown during winter. |
| Shape | Mat-forming. |
| Landscape | Ground cover, banks, slopes, flower borders, flower beds, garden edging. |
| Propagation | Propagate by seed or division in spring. |
| Cultivation | Grow in moist but well-drained soil in sun or partial shade. |
| Pests | No notable pests or diseases. |
| Habitat | Growing in temperate regions of the northern hemisphere. |
Photographs
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Persicaria affinis 'Darjeeling Red'.