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Home » Looking After » Conservation Land Management » Invasive non-native species

Invasive non-native species (INNS)

Invasive non-native species (INNS) can outcompete native UK species, physically change ecosystems and damage property. Some, like giant hogweed, can be extremely harmful to human health.

Piecemeal treatment of INNS rarely addresses sources of infection, which implies that treatment will need to continue indefinitely. Treatment is not cheap - the cost of managing INNS has been put at £1.7 billion per year in the UK - so prevention is better than cure.

Volunteers removing Himalayan balsam in Porthgain.
Volunteers removing Himalayan balsam near Porthgain.

Find out more about three of the more significant terrestrial invasive plants in the National Park - rhododendron, Japanese knotweed and Himalayan balsam – and the National Park Authority's Stitch in Time project, which aims to to tackle all the three in the Gwaun Valley.