“Additionally, thistle seed is a major food source for birds ... “This may mean mulch, a healthy stand of grass or some other kind of ground cover.” “Many invasive thistles grow in ...

The Russian thistle made its first known appearance in North America in the 1870s, in Bonhomme County, South Dakota. It's thought to have arrived surreptitiously; its inconspicuous seeds well hidden ...

As with most thistles, Scotch thistle decreases animal production by reducing the amount of pasture that livestock are prepared to eat as they avoid eating grass beside the spiny leaves, and also the ...