Eryngium planum

Cobalt blue flowers that resemble butterflies emerge in summer and last all the way into autumn. The plants can cope with light frosts but might need extra protection during extreme cold temperatures. Cut back in late summer to encourage a second flush in autumn and then trim the following year in spring to strenghten new growth.

Cone-shaped feathery red-purple flowers sit on green clover-like leaves. Like all clover variety this one is great for attracting many different pollinators, perfect for a wildlife-friendly garden. Ideal for underplanting shrubs or roses. Cutting back spent blooms may encourage a second flush.

This deciduous perennial can grow up to 1m tall and attracts butterflies, which is why it’s also called butterfly weed. Clusters of flat bright-orange flowers in midsummer are followed by long seedpods.