Summit CWMA
Class 1B · Early Detection Rapid Response

Purple Starthistle

Centaurea calcitrapa

Known in Utah but in very limited populations. Also a very high priority, because eradication is still realistic.

Jun - Aug
Treatment window
Class 1B
Utah designation
Purple Starthistle in the field

What we know

Class 1B: early detection rapid response

Known in Utah but in very limited populations. Also a very high priority, because eradication is still realistic.

Treatment on purple starthistle works best jun - aug. A full profile for this species is still being written. Until it is here, the USU Extension field guide carries identification detail, and we would rather hear from you than have you guess.

At a glance

Common name
Purple Starthistle
Scientific name
Centaurea calcitrapa
Utah class
1B - Early Detection Rapid Response
Treatment window
Jun - Aug