Daniel Docking, technical manager of the PCA’s Invasive Weed Control Group, said: "While experienced gardeners have a keen eye for plant species, there are many plant families, such as gunnera, rhododendron and bamboo, that have ornamental and invasive varieties which can be confusing. The PCA recommends three key actions to help gardeners reduce the risk of spreading invasive plants. First, gardeners are encouraged to speak with staff at their local nursery or garden centre about their labelling systems and any steps they take to highlight invasive species. Second, the PCA advises gardeners to be vigilant and seek expert help if they spot invasive plants. Even small fragments, seeds, or rhizomes left in soil can allow invasive species to re-establish.