The Kew Pollinators range of seeds from Thompson and Morgan has been specially created alongside the experts at Royal Botanic Gardens, Kew to attract and support a wide range of pollinators, including bees, butterflies and beetles, as well as a number of other important pollinating insects. Helping these pollinators to thrive is hugely important for our eco-system as a whole and these seeds, in their striking packaging inspired by artwork from the Kew archives, will help to create the environment which they need to thrive, with varieties chosen to help a wide range of pollinating insects, including some night flowering plants to help moths which also play an important part in our gardens.Knapweed makes a fabulous low-maintenance perennial, happy even in poor soils and hardy from one end of the UK to the other! This British wildflower will light up your garden borders with its glowing pink-purple blooms from June to September and is particularly attractive to butterflies. Common knapweed is a fabulous addition to informal borders, cottage gardens and wildlife gardens. Height: 75cm (30"). Spread: 50cm (20").