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, ...

Easily recognizable due to its vase-shaped purple flowers with dandelion-like seeds, Canada thistle (Cirsium arvense) is a particularly aggressive invasive plant. Despite its name, Canada thistle ...

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

Spear thistle is another highly invasive plant which can easily outcompete other species of plants in the garden, so make sure to look for it. It can be recognised by its spiky leaves and purple ...