Photo: Teun Spaans, CC BY 2.5 · source
Pruning guide · Perennial
Brown knapweed: when and how to prune
Centaurea jacea
Brown knapweed is best pruned in March and September.
| Pruning months | March and September |
|---|---|
| Flowering | June–September |
| Good for bees, butterflies and birds | Yes, for bees and butterflies |
| Native to Belgium | Yes |
Brown knapweed: when to prune it?
In September, mow or cut back the faded stems. In a border you can also leave them standing and cut them back in March.
Brown knapweed: how to prune it?
- Mow a meadow in September to 5–10 cm and leave the hay on the ground for a few days so the seed can drop.
- Then remove the cuttings, so the soil stays poor.
- In a border, cut the stems back in March to just above the rosette.
- Leave a few stems over winter for seed-eating birds and overwintering insects.
How much to cut, and how often?
- There are 2 pruning periods a year: March and September. You don’t have to prune in every one.
What does it mean for wildlife?
- Brown knapweed flowers in June–September, when it attracts bees and butterflies.
- 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.
Nearby: related pruning guides
Plant profile: Brown knapweed · Pruning calendar and basic rules
This guide is compiled from the Bladwijzer plant profile and pruning calendar.