Eupatorium cannabinum - wild Hemp Agrimony

This is one of the very best late wildflowers for butterflies. It is the only Eupatorium native to Britain.In this photo there is a rare White-letter Hairstreak feeding on it. This plant likes to grow in damp conditions, where it can grow to 4 or 5 feet tall (if kept drier it will flower on a shorter stem). A hardy herbaceous perennial.