Scotch thistle is a biennial weed, so it depends quite heavily on the establishment of seed on a regular basis if it is to be found commonly in any particular situation. In contrast, many pasture ...

Scotch thistle (Onopordum acanthium) is a biennial native to Eurasia. It was introduced into the U.S. as an ornamental and as ...

Winged thistle is a winter annual, which means it generally establishes from seed in autumn, grows as a typical thistle ... clopyralid or triclopyr/picloram. Scotch thistle is the most common thistle ...

“Additionally, thistle seed is a major food source for birds, such as goldfinches.” Here’s how to identify which kind of thistles you have, and how to get rid of bad thistles for goo ...