Photo: self, CC BY-SA 3.0 · source
Pruning guide · Perennial
Jacob's ladder (Polemonium caeruleum): when and how to prune
Polemonium caeruleum
Jacob's ladder (Polemonium caeruleum) is best pruned in March and July.
| Pruning months | March and July |
|---|---|
| Flowering | May–July |
| Good for bees, butterflies and birds | Yes, for bees |
| Native to Belgium | No, planted |
Jacob's ladder (Polemonium caeruleum): when to prune it?
In July, after flowering, cut the flower stems back. In March, clear away the old leaves.
Jacob's ladder (Polemonium caeruleum): how to prune it?
- Cut the spent flower stems back to just above the leaves at the base.
- If you want seedlings, leave a few stems until the seed is ripe.
- In March, cut away the dead leaves before the new rosettes start to grow.
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?
- Jacob's ladder (Polemonium caeruleum) flowers in May–July, 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: Jacob's ladder (Polemonium caeruleum) · Pruning calendar and basic rules
This guide is compiled from the Bladwijzer plant profile and pruning calendar.