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Pruning guide · Perennial
Soapwort: when and how to prune
Saponaria officinalis
Soapwort is best pruned in March and August.
| Pruning months | March and August |
|---|---|
| Flowering | July–September |
| Good for bees, butterflies and birds | Yes, for bees and butterflies |
| Native to Belgium | Yes |
| Poisonous to people and pets | Yes, take care with children and pets |
Soapwort: when to prune it?
In August cut back after the first flush, and in late February–March clear the old stems.
Soapwort: how to prune it?
- In August, cut the spent stems back by a third: you get a second flush in September and a sturdier plant.
- In March, cut all old stems down to just above the ground.
- During the spring work, also cut off any runners that have gone too far.
How much to cut, and how often?
- There are 2 pruning periods a year: March and August. You don’t have to prune in every one.
What does it mean for wildlife?
- Soapwort flowers in July–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.
Caution: Wear gloves when cutting back and keep the sap out of your eyes. Soapwort is poisonous: wear gloves and keep clippings away from children, pets and livestock.
Nearby: related pruning guides
This guide is compiled from the Bladwijzer plant profile and pruning calendar.