Bull Thistle is a biennial plant with spiny leaves and purple flowers. It is considered a weed in many areas due to its aggressive growth and spiny nature.
Best time to see a Bull Thistle
The best time to see a Bull Thistle is May–August, when about 62% of U.S. sightings happen, based on 54,128 research-grade iNaturalist observations.
Not certain it is a Bull Thistle? What plant is this? walks through what to check first and the lookalikes that catch people out.
Recent Bull Thistle sightings near you
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