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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 turn to...
2 litre pot
In stock (shipped within 2-3 working days)
3 × 2 litre pots
In stock (shipped within 2-3 working days)
9cm pot
£9.99
available to order from autumn
3 × 9cm pots
£22.99
£7.66 each
available to order from autumn
1
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.
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:
Incorporate a generous amount of composted organic matter or well-rotted manure into the backfill during planting. Once established, 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.
