and lance-leafed thistle, is a biennial weed found in almost every state and territory in the USA, including Alaska and Hawaii. Originally native to West Asia, parts of Europe, and North Africa ...

When it comes to common weeds, few are as problematic as Canada thistle. This plant has a tenacious and fast-growing root system. A single seed is all it takes for an entire patch to spring up and ...

As with many members of the Asteraceae family, it starts life as a rosette, and then bolts to form an upright flower stem. Sow thistle is an annual weed that can establish at any time of the year. It ...

Nodding thistle is a biennial weed, typically establishing in autumn in pastures that have been damaged by drought over summer. In autumn with the first substantial rainfalls, as there is bare soil, ...

“The rapidity with which the Russian thistle has spread, both in infesting new territory and in thoroughly covering that already infested, far exceeds that of any weed known in America,” Dewey ...

This is especially effective on weeds with short dormancy periods, such as kochia, goat’s beard, hare’s ear mustard, Indian mustard, Russian thistle, cow cockle, green foxtail, downy brome, wild ...

Canada thistle differs from other species of the true thistle in that there are male and female flower heads, and these are on separate plants. By asexual reproduction, it is possible that a colony of ...