About the Musk Thistle: Also called Nodding thistle, it's found up to 9,000 feet in elevation and can grow up to 8 feet tall. A biennial, musk thistle is taprooted and reproduces by seed. With one purplish flowering head per stem, the outer broad, stout phyllaries (Aster family bracts) spreading and bent downward, the whole set of them high and hairy.
Fire Effects Information System (FEIS) - Centaurea solstitialis USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory. PLANTS Database - Yellow Star-thistle USDA. NRCS. National Plant Data Center. International Government. Weeds in Australia - St Barnaby's Thistle (Centaurea solstitialis) Australian Government.
The perennial sow thistle (Sonchus arvensis) is often confused with the annual sow thistle (Sonchus oleraceus). The main difference between the two is that the annual sow thistle has much smaller flowers (less than 2.5 cm across) than the perennial sow thistle. Perennial sow thistle flowers are larger and resemble the dandelion.
Perhaps one of the most noxious weeds in the home garden, Canada thistle has a reputation for being impossible to get rid of. Canada thistle control is difficult but the following info may help. Perhaps one of the most noxious weeds in the home garden, Canada thistle has a reputation for being impossible to get rid of.
Blessed thistle might be safe for most people. In high doses, such as more than 5 grams per cup of tea, blessed thistle can cause stomach irritation and vomiting. Special Precautions & Warnings: Pregnancy and breast-feeding: Don’t take blessed thistle by mouth if you are pregnant.