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 ...

Scotch thistle is a biennial weed, so it depends quite heavily on the establishment of seed on a regular basis if it is to be found commonly in any particular situation. In contrast, many pasture ...

Sow thistle is an annual weed that can establish at any time of the year. It is also known as puha, and is eaten by some people as a vegetable. Although known as a food favoured by some Māori people ...