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Greater Knapweed

©Dominic Alves

Greater knapweed

The ragged-edged, purple flower heads of Greater knapweed bloom on sunny chalk grasslands and clifftops, and along woodland rides. They attract clouds of butterflies.

Scientific name

Centaurea scabiosa

When to see

June to September

Species information

Category

Statistics

Height: up to 1m
Common.

About

Greater knapweed is a thistle-like plant that can be found on chalk downlands, roadside verges, woodland rides, hedgerows and clifftops. It is more restricted in its distribution than its close relative, Common knapweed, being found mainly in England on chalky soils. It is in bloom from June to September and is a huge favourite of all kinds of butterflies, including Common blues, Marbled whites and Meadow browns, and is sometimes covered in these species.

How to identify

The large, bright pink-purple 'flowers' of Greater Kanpweed are actually composite flower heads made up of many small 'florets' (tiny flowers). The large, ragged, star-like ones sit around the edge of the flower head and are sterile, serving only to attract insects; while the smaller, densely packed florets in the middle are fertile.

Distribution

Scattered across the UK, but predominantly grows in England.

Did you know?

Knapweeds make a good addition to a wildlife garden, attracting a variety of insects and even some countryside butterflies. They prefer sunny borders and can grow much larger than they do in the wild.