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 ...

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 ...

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.

“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 ...