The very prickly Bull Thistle (Cirsium vulgare) can be found along roads, and in fields and disturbed areas such as logging slashes. I found this specimen on a logging road near Chippewa Bay on Powell Lake.
Bull Thistle is an invasive species introduced from Euroasia. It's considered a noxious weed because it can spread easily in fields, keeping stock from grazing, and can contaminate hay.
Bull Thistle is a member of the Aster Family. It's widely distributed throughout Canada and the United States. It's a biennial plant (taking two years before going to seed) that can grow up to two metres tall. Rigid upright stems have spine tipped leaves. Thistle heads are surrounded by spines and sport bright pink to purple flowers.
Canada Thistle. Both have those beautiful bright flowering heads. Goes to show, there's always something good, even in the bad. -- Margy