Photo: Franz Xaver, CC BY-SA 3.0 · source
Pruning guide · Perennial
Purple toadflax: when and how to prune
Linaria purpurea
Purple toadflax is best pruned in March and July.
| Pruning months | March and July |
|---|---|
| Flowering | June–September |
| Good for bees, butterflies and birds | Yes, for bees |
| Native to Belgium | No, planted |
Purple toadflax: when to prune it?
In March to clear the old stems; after the first flowering, in July, for a second flush.
Purple toadflax: how to prune it?
- In March cut the old, dead stems down to 10 cm above the ground, before the new shoots appear.
- In July cut the spent spikes back by half: this often gives a second flush and stops all the seed from ripening.
- If you do not want self-sown seedlings, cut off the spikes before the seed ripens.
- Leave a few spikes in autumn if you want seedlings for next year.
How much to cut, and how often?
- There are 2 pruning periods a year: March and July. You don’t have to prune in every one.
What does it mean for wildlife?
- Purple toadflax flowers in June–September, when it attracts bees.
- If pruning falls during flowering, wait until it is over or leave part of the plant to flower, so bees and butterflies still benefit.
Nearby: related pruning guides
Plant profile: Purple toadflax · Pruning calendar and basic rules
This guide is compiled from the Bladwijzer plant profile and pruning calendar.