The dense clusters of deep pink, almost crimson flowers, of Red Valerian are unmistakeable as they grow out on tall stems from old stone walls, roadside verges, railway cuttings, cliffs and rocks. Introduced into gardens before the 1600s, this plant from the Mediterranean soon escaped and became naturalised in the wild. Despite its non-native status, it is a good source of nectar for bees, butterflies and moths like the Hummingbird Hawk-moth.
Red Valerian is an introduced species that has become widespread and naturalised in the UK over hundreds of years without much cause for concern. However, the effects of introduced species are not always as benign. The Wildlife Trusts work with researchers, scientists and other conservationists to monitor changes in our native wildlife to determine the effects of environmental change, such as the introduction of new species or climate change. You can help: volunteer for your local Trust and you'll be able to monitor populations and survey habitats, adding to a growing bank of data.