Himalayan balsam is spreading rapidly along the banks of Hope Valley streams and river Derwent. A non-native, it grows rapidly, smothering all other plants, and is considered an invasive plant, listed under Schedule 9. An offence to plant in the wild, it is a social duty to remove it when possible.
Hope Valley river and stream banks naturally grow a great variety of wild plants, some flowering, such as meadow sweet, marsh marigold and Hemp-agrimony. These are not only beautiful, sometimes scented, but also a significant habitat for wildlife. The insects which live and feed on these plants are essential for pollination. So this non-native is threatening essential biodiversity.
Himalayan balsam (Impatiens glandulifera) is tall (I saw some much higher than me along the banks of the Thames), pink flowering, sickly scented annual which grows in dense clumps. The seed pods explode when touched, delightful to children (and many adults). This scattering (up to 7 metres) ensures wide dissemination. They die back in winter, and can cause bank erosion.
Hathersage Rewilding Group has been assessing its spread, and uprooting as many as possible; sometimes wading in the brook to reach it (with permission; each taking responsibility for their own safety). This has to be done before the seeds are ripe (August). It’s energetic but satisfying work, as each plant pulls out of the damp earth with much of its roots.
Contact Carol Collins if you would like to help carolwcollins61@gmail.com
