Invasive plants will ... from May to August, nodding to the ground as they mature. Multiple mowing rounds before the thistles bud out can keep them in check. Bull thistle (Cirsium vulgare) is ...

Nodding thistle is often listed as a Pest Plant by Regional Councils in areas where nodding thistle is still only just establishing, making it a legal requirement to control it. Nodding thistle can be ...

European marsh thistle, a terrestrial and wetland herbaceous biennial in the Asteraceae family, is an invasive plant that prefers moist soils. European marsh thistle frequently invades fens, wetlands, ...

Canada thistle, a terrestrial herbaceous perennial in the Asteraceae family, is an open-land invasive that prefers disturbed upland ... annually hand pull or dig rosettes and adult plants, dry in the ...