| Scientific Name: | Reynoutria japonica ( syn. Fallopia japonica ) |
| Common Name: | Japanese knotweed |
| Family Name: | Polygonaceae |
| Origin: | S.E. Asia / Japan / China |
| Hardiness Zone: | Zone 5: (-29 to -23 °C) |
| Plant Type: | Herbaceous perennial, Invasive plant, Shrub - deciduous |
| Mature Size: | 2 - 3m x 7 - 10m (height x width) |
| Habit: | Upright |
| Form: | Oval - vertical, Round |
| Texture: | Medium - coarse |
| Landscape Uses: | n/a |
| Exposure: | Full sun, Part sun/part shade, Filtered shade, Deep shade |
| Soil or Media: | Well-drained |
| Leaves: | Simple, Alternate, Soft flexible, Pinnate venation, Glabrous, Ovate, Entire |
| Flowers: | Panicle, White, Aug-Sep |
| Fruit: | Capsule, White, Brown, Sep-Oct |
| Key ID Features: | |
| Stems hollow, bamboo-like, arising from rhizomes; leaves alternate, ovate, most 10-17cm long x 8-14cm wide, base truncate, apex with an abruptly pointed tip, undersides have small ridges or bumps on veins or margins, margin entire, apex; flowers creamy-white, 2-3mm wide, in panicles arising from leaf axils ~15cm long. | |