Not known to exist in Utah. Significant risk of invasion. Swift eradication is the highest priority if found.
Quick Facts
Report your sighting through EDDMapS to help us track and respond to new infestations.
Report on EDDMapSMalta Starthistle
Centaurea melitensis
Overview
Malta starthistle is an annual or biennial plant from the Mediterranean that invades rangelands, roadsides, and disturbed areas. It is toxic to horses and can cause a neurological condition called "chewing disease." Dense infestations reduce forage production.
How to Identify
Branching annual or biennial 1-3 feet tall. Spiny flower heads with yellow flowers. Leaves are deeply lobed near the base, becoming smaller and less lobed up the stem. Spines are straw-colored.
Control Methods
Hand-pull before seed set. Mowing can reduce seed production. Competitive seeding with desirable species. Herbicide treatment in early growth stages.
Herbicide Recommendations
Clopyralid, picloram, or aminopyralid. Apply in early spring or fall on rosettes.
⚠️ 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.
