Himalayan balsam
Where would you find it living?
Found in riverbanks, waste land and damp woodlands but can also invade gardens and allotments.
What are the impacts?
- each plant can produce up to 800 seeds. These are dispersed widely as the ripe seedpods shoot their seeds up to 7m (22ft) away
- Himalayan balsam can completely take over river banks and woodland, crowding our native species preventing them from growing
- it can also increase the chances of soil erosion, danger of landslides and risks of flooding
How do you remove Himalayan balsam?
Hand-pulling or cutting Himalayan balsam plants well in advance of its flowering and as long as it is cut down below the last node is an effective method, especially for small infestations. Ensure that you remove the entire plant, including the roots, to prevent regrowth. Wear appropriate protective clothing, including gloves, to avoid contact with the sap.
When should the removal process take place?
Schedule removal efforts before the plant reaches the seed-setting stage. This is typically in early summer, before the seed pods mature and explode, spreading the seeds. By preventing seed production, you can limit the plant's ability to reproduce and spread.
How do you dispose of Himalayan balsam?
Collect and bag the pulled or cut Himalayan balsam plants for proper disposal. Do not compost them, as the seeds can remain viable and germinate.
Do you need to monitor the treatment of Himalayan balsam?
Yes. Himalayan balsam has a high seed production rate and can quickly re-establish itself if seeds remain in the soil. Continuously monitor the treated areas and promptly remove any regrowth. Multiple years of treatment may be necessary to exhaust the seed bank and eradicate the plant.
How do you report a sighting of Himalayan balsam on council land?
The council is only required to undertake treatment of invasive non-native species where it is present on council owned land.
If you are concerned about any possible invasive non-native species on Wirral Council land, please report it with a photograph and specific location: