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Pruning guide · Herbaceous plant
Fennel: when and how to prune
Foeniculum vulgare
Fennel is best pruned in March and September.
| Pruning months | March and September |
|---|---|
| Flowering | July–September |
| Native to Belgium | Yes |
Fennel: when to prune it?
In September, cut off the seed heads if you want fewer seedlings; in March, cut the old stems to just above the ground.
Fennel: how to prune it?
- Cut the umbels when the seed turns greyish brown, and let them finish drying in a paper bag.
- Leave some stems standing over winter as shelter for insects.
- In March, remove the old stems just above the new shoots at the base.
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?
- As a native plant, it feeds more insects than a non-native species.
Caution: Don’t cut back or harvest in summer if there are swallowtail caterpillars on the plant.
Nearby: related pruning guides
This guide is compiled from the Bladwijzer plant profile and pruning calendar.