It is a tall herbaceous perennial with erect, branching stems which grow up to 2 metres in height, bearing sparse, oblong leaves.

 

Numerous branched clusters of small, lilac-purple flowers appear from summer to autumn; these are a fantastic nectar source for pollinating insects, such as bees and butterflies.

 

They also add architecture to your broader borders, or can flirt with plants and pathways.

 

Top tip; If you’d like more of these plants, let them go to seed before cutting down.