Seeds remain viable for up to 50 years. The flowering period is from late june until frost in the fall. Musk thistle is biennial or sometimes a winter annual, which grows up to 6 feet tall. Leaves are ...

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 ...