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 ...

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 ...

Russian thistle is an annual weed, reproducing by seeds. The stems are up to 1.2 m tall, red striped, and spread as much or more horizontally as vertically. The leaves are alternate, long, 2-5 cm, ...