Not every plant that is prickly is a thistle. So how do you identify a prickly plant that you come across to determine if it is native or non-native thistle or not even a thistle? Assuming that ...

They spread via seeds and stray plant parts. Since musk thistle (Carduus nutans) can produce over 20,000 straw-colored seeds singularly, it quickly carpets the area, outcompeting native vegetation.

As a public service, the herbarium offers free plant identifications. For more information, call 803-777-8175 or email [email protected].

Improving your soil will weaken thistle and help desired plants grow better. We recommend investing in a $9 soil test kit from your local extension office. Thistle has an extensive root system.

The Wyoming Natural Diversity Database (WYNDD) at the University of Wyoming has released a new field guide on Wyoming thistles, designed to assist those who work or recreate outdoors in identifying ...

“Asters, Groundsels, and especially Thistles, afford most familiar examples of a hairy or downy pappus; those of thistles, &c. in autumn sailing about in every breeze.” — Asa Gray, “How ...

Answer Man: I was driving along Norton Road when I spotted some musk thistle, a plant considered a noxious weed. I think as recently as five years ago there was a musk thistle hotline to call ...