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Submit a photoYellow Starthistle
Centaurea solstitialis
⚠️ PROHIBITED NOXIOUS — a winter annual from the Mediterranean with grey-green foliage and small yellow thistle-like flowers surrounded by long sharp spines that can injure humans and livestock. Toxic to horses — causes 'chewing disease' (nigropallidal encephalomalacia), a fatal neurological disorder. Has devastated millions of hectares in the western US; Alberta is at risk. Report any sightings.
Quick Facts
Distribution
Very rare in Alberta — report sightings immediately
Light
Full sun
Bloom Time
July–Sept
Soil
Well-drained; tolerates poor soils
Water
Low
Growing & Cultivation
Propagation
DO NOT PROPAGATE. Control: early-season tillage or herbicide; remove before seed set.
Always verify plant identification with multiple sources before consuming any wild plant. This information is for educational purposes only.
