Photo: Louise Docker from Sydney, Australia, CC BY 2.0 · source
Pruning guide · Annual
Sweet William: when and how to prune
Dianthus barbatus
Sweet William is best pruned in July.
| Pruning months | July |
|---|---|
| Flowering | June–July |
| Good for bees, butterflies and birds | Yes, for bees and butterflies |
| Native to Belgium | No, planted |
| Poisonous to people and pets | Yes, take care with children and pets |
Sweet William: when to prune it?
After flowering, in July, cut back the flower stems. No other pruning is needed.
What else to prune in those months? July
Sweet William: how to prune it?
- Cut the spent stems back to just above the leaf rosette.
- If you want it to self-seed, leave a few heads until the seed is ripe.
- If you cut it back after flowering, it often flowers for a second year; otherwise, replace it.
How much to cut, and how often?
- One pruning period a year: July.
What does it mean for wildlife?
- Sweet William flowers in June–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: Sweet William is poisonous: wear gloves and keep clippings away from children, pets and livestock.
Nearby: related pruning guides
Plant profile: Sweet William · Pruning calendar and basic rules
This guide is compiled from the Bladwijzer plant profile and pruning calendar.