Himalayan balsam (Impatiens glandulifera) is an invasive non-native plant that grows rapidly and produces large numbers of seeds. It is commonly found beside rivers, streams and ditches, but it can also establish in gardens, woodland, fields and on development sites.
As it spreads, the plant can form dense stands that compete with native vegetation. Along watercourses, seeds can be carried downstream, making it difficult to manage affected land in isolation. After the plants die back in autumn, areas where native vegetation has been displaced may be left vulnerable to erosion.
Unlike Japanese knotweed, Himalayan balsam does not rely on an extensive underground rhizome system to spread. It reproduces mainly through seeds, which can be scattered when mature seed pods burst and carried further by water or the movement of contaminated soil.
Our approach to its removal and management considers the extent of the growth, how the land is used and whether the site connects to neighbouring land or watercourses. We can then recommend a suitable programme to reduce growth and prevent further seed production.
