Photo: Hans Hillewaert, CC BY-SA 3.0 · source
Pruning guide · Perennial
Common bistort (Persicaria bistorta): when and how to prune
Persicaria bistorta
Common bistort (Persicaria bistorta) is best pruned in March and July.
| Pruning months | March and July |
|---|---|
| Flowering | May–July |
| Good for bees, butterflies and birds | Yes, for bees |
| Native to Belgium | Yes |
Common bistort (Persicaria bistorta): when to prune it?
After the first flush, in July, cut away the spent stems for a second flush. In March, tidy away the old, dead leaves.
Common bistort (Persicaria bistorta): how to prune it?
- In July, cut the spent flower stems off at the base.
- If the leaves look tired or brown, cut them back too, then water and give a little compost.
- In March, cut away last year’s dead leaves, just above the new shoots.
How much to cut, and how often?
- There are 2 pruning periods a year: March and July. You don’t have to prune in every one.
What does it mean for wildlife?
- Common bistort (Persicaria bistorta) flowers in May–July, when it attracts bees.
- If pruning falls during flowering, wait until it is over or leave part of the plant to flower, so bees and butterflies still benefit.
- As a native plant, it feeds more insects than a non-native species.
Caution: In a dry summer, only cut back if you can water afterwards.
Nearby: related pruning guides
- Amphibious bistort
- Himalayan knotweed (Persicaria affinis)
- Jumpseed (Persicaria virginiana)
- Red bistort (Persicaria amplexicaulis)
- Vietnamese coriander
Plant profile: Common bistort (Persicaria bistorta) · Pruning calendar and basic rules
This guide is compiled from the Bladwijzer plant profile and pruning calendar.