Photo: Johann Georg Sturm (Painter: Jacob Sturm), Public domain · source
Pruning guide · Herbaceous plant
Hemlock: when and how to prune
Conium maculatum
Hemlock is best pruned in July and September.
| Pruning months | July and September |
|---|---|
| Flowering | June–August |
| Native to Belgium | Yes |
Hemlock: when to prune it?
In July, before the seed ripens; clear dead plants in September.
Hemlock: how to prune it?
- Cut off the umbels when most flowers have faded, before the fruits turn brown.
- After setting seed the plant dies by itself; pull up or cut the dry stem in September, wearing gloves.
- Do not leave any pieces on a lawn, in a pasture or where children play.
How much to cut, and how often?
- There are 2 pruning periods a year: July 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: Never let children use hollow hemlock stems as whistles or peashooters.
Nearby: related pruning guides
This guide is compiled from the Bladwijzer plant profile and pruning calendar.