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 ...

When it comes to invasive weeds that can be difficult to remove, a few thistle species rise to the top of the list. According ...

Scotch thistle is the most common thistle species in New Zealand with spines on both the leaf surface and margins. Scotch thistle is a biennial weed, so it depends quite heavily on the establishment ...

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 ...