Medium tall plant with tattered-looking, spiny
leaves. Flowers purple, rarely white, in small heads. Seeds spread
on dandelion-like down. Blooms in summer.
A very bad weed from Europe. Spreads by
underground runners, and thus very difficult to eradicate.
Fortunately occurs only in limited patches along the edges of
Other thistles have fewer, larger flower heads
that are, in most cases, spiny like the leaves.