Limited distribution in Utah. High priority to eradicate all known populations and prevent new ones.
Quick Facts
Report your sighting through EDDMapS to help us track and respond to new infestations.
Report on EDDMapSPurple Starthistle
Centaurea calcitrapa
Overview
Purple starthistle is a biennial or short-lived perennial from the Mediterranean that invades rangelands, roadsides, and disturbed areas. Its sharp spines make it unpalatable to livestock and can injure animals and people. Dense infestations significantly reduce forage production.
How to Identify
Branching biennial 1-3 feet tall. Purple flower heads surrounded by long, sharp spines. Leaves are deeply lobed. Spines are 1-2 inches long and very sharp.
Control Methods
Hand-pull or dig rosettes before flowering. Mowing before seed set. Herbicide treatment on rosettes.
Herbicide Recommendations
Clopyralid, picloram, or aminopyralid applied to rosettes in fall or spring.
⚠️ Always read and follow pesticide label directions. Contact your county weed superintendent for site-specific recommendations. Permits may be required near water.
Need help managing this weed?
Skyline CWMA can connect you with technical assistance, cost-share programs, and licensed contractors for treatment on your property.
