Canada thistle (Cirsium arvense) is a creeping perennial broadleaf that is native to the Mediterranean area. It spreads ...

Russian thistle can also be a host for insects that transmit curly top viruses, which stunt the growth of an infected plant and deforms its leaves and fruit. The plant's pollen is a potent allergen, ...

It may look like the last thing you'd want to eat, but that scary-looking bull thistle is edible. Here's how to prepare it according to the LSU Ag Center ...

Milk thistle has been used for its purported medicinal properties for thousands of years, but its supplement form didn't explode until recently. Milk thistle supplement sales in the U.S. reached $ ...

It is most likely to be confused with a closely related species called prickly sow thistle (Sonchus asper), which looks very similar but has more prickly leaves than the sow thistle. The lobes in each ...

European marsh thistle frequently invades fens, wetlands, and disturbed sites such as roadside ditches. Identifying features include: typically grows 2-7 feet tall leaves are alternate with deeply ...

Scotch thistle is the most common thistle species in New Zealand with spines on both the leaf surface and margins. Scotch thistle is a biennial weed, so it depends quite heavily on the establishment ...

Bull thistle, a member of the Asteraceae family, is yet another herbaceous biennial on our list of invasives. Unfortunately, bull thistle can flourish in an array of sites ranging from meadows, ...