If you opt for chemical control, focus on the first-year rosette ... of your plants.” Psstthese are the worst invasive plants ...

After germinating in the fall, they develop a rosette ... foot-tall plants before they've set seeds ensures control. Unlike other thistle plants that establish deep taproots, the Canada thistle ...

It is almost impossible to completely pull out an established thistle plant because ... producing a low-growing rosette of foliage then only flowering the second year. Canada thistles can bloom ...