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Bull Thistle
Cirsium vulgare
Photo by Dr. John Meade, weed scientist emeritus
Rutgers NJAES Cooperative Extension
Bull thistle is a true biennial. It forms a rosette of leaves the first year and then sends up a flowering stalk the next year. Like other thistles it has sharp spines on stem and leaves. The flower is blue and quite large. Normally a weed of untilled fields.
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