Bull thistle starts out life as a prickly ground-hugging rosette that, in the summer, puts out tall, equally spiny stalks topped with purple flowers. Later, fluffy white seed heads form.
Flower heads can appear as a small clump or solitary at the apex of a stem. Blooms spring to early fall. Bull thistle seeds are numerous and straw-colored. The seeds are one tenth to two tenths of an ...
Like many other biennial invasives, bull thistle is able to produce a large seed bank that can remain viable for up to 10 years! As a result, the plant can easily spread and form dense stands in ...
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How to Get Rid of Thistle Weeds for Good
They reproduce via seeds only. If you see one, take immediate action to get rid of it. “Bull thistle is considered noxious in ...