First introduced as garden plants from South America, Giant Rhubarb Gunnera species is now naturalised and present throughout the UK. It is a large, clump-forming perennial with umbrella-sized leaves and stems up to 2 m tall. The plant dies down in the winter but grows new leaves in spring. The seeds are spread through watercourses and by birds and once established form dense colonies, suppressing native plants and blocking drainage ditches and pipes.
It is more widely distributed than the distribution maps suggests and is a serious problem in parts of Harris, although measures are being take to try and eradicated it.
Information and Identification Sheets: Giant Rhubarb