Californian thistle is one of the most common thistle species in New Zealand. It is very troublesome in pastures because it is so difficult to control. Once a plant is established in pasture, it forms ...

As with most thistles, Scotch thistle has a tap-root. However, it is the only thistle species in New Zealand that has spines on the foliage on the surface of leaves in addition to around the leaf ...

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 ...