Identifying features include: Like other thistles, bull thistle is armed with a great number of spines that can and will penetrate exposed skin. For more information visit the Midwest Invasive Species ...

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 ... key ...

Some states have introduced bull thistle predators — like Urophora stylata, a seed-head-eating species of fruit fly, and the weevil species Trichosirocalus horridus — as a biological control.