Knotweed 'Firetail'
Persicaria amplexicaulis 'Firetail'
Knotweed 'Firetail' is a perennial for mid-border, suited to full sun to partial shade and clay, loam or moist ground, flowering Jul, Aug, Sep, Oct.
| Type | Perennial |
|---|---|
| Mature height | 120 cm |
| Spread | 90 cm |
| Aspect | full sun to partial shade |
| Foliage | Deciduous |
| Hardiness | USDA 5a-8b, RHS H7 |
| Pollinator-friendly | Yes |
| Pet-safe | Not confirmed |
Where to use it in a border
At around 120 cm, it sits best toward the back of a border, or on its own as a focal point with room around it. Give it about 90 cm of room to spread. It is hardy across USDA zones 5a to 8b and rated H7 by the RHS, so check it suits your area before planting.
It appears in our lists of full sun, clay soil, wet soil, pollinator-friendly plants.
Border Builder uses Knotweed 'Firetail''s height, spread, soil, bloom months and companions to place it in a full border plan for your own conditions, on iPhone and iPad.
Flowering through the year
Worth knowing
- It copes with ground that stays wet, which most border plants will not.
- Its flowers are valued by bees and other pollinators.
Good companions
Plants that share its conditions and style, chosen to complement its place in the border:
- Allium 'Purple Sensation'to flower when it does not
- Angelita Daisyto edge in front
- Autumn Sageto edge in front
- Avensto edge in front
- Baja Fairy Dusterto flower when it does not
- Bear Grassto flower when it does not
Garden styles
Sources
Bloom timing and hardiness drawn from: