Bull thistle starts out life as a prickly ground-hugging rosette that, in the summer, puts out tall, equally spiny stalks ...

One feature I have found works quite well for telling winged thistle from slender winged thistle is the length of the pappus material around the seeds as they blow out of the seed heads. The pappus ...

It is known as musk thistle in some countries overseas. The species gets the name "nodding thistle" because of the large seed heads that "nod" over due to their weight, for example, they tend not to ...

Musk thistle usually begins flowering in May and may bloom from seven to nine weeks. Seed dispersal begins seven to ten days ...