Photo: Wikimedia Commons, CC BY-SA 3.0 · source
Pruning guide · Herbaceous plant
Marsh thistle: when and how to prune
Cirsium palustre
Marsh thistle is best pruned in September.
| Pruning months | September |
|---|---|
| Flowering | June–September |
| Native to Belgium | Yes |
Marsh thistle: when to prune it?
After seed set, in September; the plant dies by itself after flowering.
What else to prune in those months? September
Marsh thistle: how to prune it?
- Let some of the heads ripen for the birds and for new seedlings.
- Cut off the other spent heads before they turn fluffy.
- Feel free to leave the dead stems standing until spring: insects find shelter there.
- Then cut them down at ground level.
How much to cut, and how often?
- One pruning period a year: September.
What does it mean for wildlife?
- As a native plant, it feeds more insects than a non-native species.
Caution: Wear sturdy gloves and long sleeves: the whole stem is covered in spines.
Nearby: related pruning guides
Plant profile: Marsh thistle · Pruning calendar and basic rules
This guide is compiled from the Bladwijzer plant profile and pruning calendar.