Aggressive spreaders, like the infamous purple musk thistle (Carduus nutans), sprout wherever there is bare soil. They'll turn from tiny seedlings into giant plants if they're left unbothered. They're ...

While a warm, wet spring has meant abundant growth of flowers in gardens and wildflowers in the high country, it has also led to an explosive growth of noxious weeds. In particular, invasive thistles ...

BOZEMAN, Mont. – A new publication from Montana State University Extension is designed to help identify invasive exotic thistles and verify those that are native to Montana. People often think that ...