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

Identifying features include: Like other thistles, bull thistle is armed with a great number of spines that can and will penetrate exposed skin. For more information visit the Midwest Invasive Species ...

Canada thistle, a terrestrial herbaceous perennial in the Asteraceae family, is an open-land invasive that prefers disturbed upland areas as well as wet areas with water fluctuations. Canada thistle ...

This plant is an icon of the Old West, featured in movies, song lyrics and more, however, its representation in media may be somewhat misleading. Russian thistle is highly invasive in North America.

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 ...