Mulching is a great way to prevent thistle from taking root. Doing so will help keep the plant's seeds from germinating.

Thistles are a marvelous group of plants. Botanists place them all as members of the sunflower (or aster) family, which is a truly gargantuan group with more than 20,000 species.

Canada thistle (Cirsium arvense) may sound friendly and indeed it has a lovely purple flower, but gardeners and landowners know better. This prickly perennial weed is a menace and is listed as a ...

15min 00sec Courtesy: Denver Botanic Gardens The funky thistle is a new species of plant identified in Colorado. You'd think in this era of modern science, there'd be nothing new under the sun.