Bull thistle is extremely hardy, thriving in acidic and alkaline soils, heavy clay, and even gravel. It grows and spreads quickly, outcompeting native plants for water, food, and space.

These plants produce a large amount of nectar and pollen, making them a great "meal" spot for hummingbirds. The birds can ...

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 ...

typically grows 3-5 feet tall stalk-less leaves around 6 inches long, wavy, lobed leaves with yellow spines at each lobe stem is spineless, unlike the leaves and unlike bull thistle ... and adult ...