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Bistorta affinis 'Superba'
East Indian knotweed 'Superba' (syn. Persicaria affinis 'Superba')
'Superba' is a vigorous, mat-forming semi-evergreen perennial whose leaves create a carpet-like effect beneath the pink flowers, which...
3 × 9cm pots
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9cm pot
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2 litre pot
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available to order from summer
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Plant description
'Superba' is a vigorous, mat-forming semi-evergreen perennial whose leaves create a carpet-like effect beneath the pink flowers, which turn to crimson as they mature. Not to be confused with the similarly named Bistorta officinalis 'Superba', East Indian knotweed blooms during the summer and boasts excellent autumn foliage colour. To add vertical interest in the border right through to mid-autumn, it's best to plant this bistort in bold swathes and give it plenty of space. It's also worth noting that bees and other insects are attracted to this plant.
Eventual height & spread
Flowering period
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Plant features
Position
Full sun / light shade
Rate of growth
Average
Soil
Moderately fertile, moist, well-drained soil
Hardiness
Fully hardy
How to care for Bistorta affinis Superba:
Lift and divide congested clumps in spring or autumn. Cut back after it has finished flowering, or wait until late winter or early spring. Apply a mulch of composted organic matter every year.
Please note:
This perennial dies back to below ground level each year in autumn, then fresh new growth appears again in spring.
