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Pruning guide · Perennial
Perennial cornflower: when and how to prune
Centaurea montana
Perennial cornflower is best pruned in March and June.
| Pruning months | March and June |
|---|---|
| Flowering | May–July |
| Good for bees, butterflies and birds | Yes, for bees and butterflies |
| Native to Belgium | No, planted |
Perennial cornflower: when to prune it?
In June, after the first flush, cut the whole plant back to just above the ground. In March, clear away dead leaves.
Perennial cornflower: how to prune it?
- Cut all stems and leaves back to 5 cm above the ground.
- Then water and add some compost: within a few weeks fresh leaves appear, often followed by a smaller repeat flush in late summer.
- In between, cut off faded flowers if you do not want seedlings: it self-sows readily.
- In March, clear away old, dead leaves.
How much to cut, and how often?
- There are 2 pruning periods a year: March and June. You don’t have to prune in every one.
What does it mean for wildlife?
- Perennial cornflower flowers in May–July, 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.
Caution: Do not wait too long to cut it back: after flowering the clump flops open and the leaves often get powdery mildew.
Nearby: related pruning guides
Plant profile: Perennial cornflower · Pruning calendar and basic rules
This guide is compiled from the Bladwijzer plant profile and pruning calendar.