Thistles

Thistles are a group of flowering plants characterized by leaves with sharp prickles on the margins, most notably in the Asteraceae family. While many species are considered invasive agricultural weeds due to their aggressive spreading habits and resilient root systems, they play an important ecological role as a vital food source for numerous pollinators, including bees and butterflies, as well as seed-eating birds like goldfinches. Their robust defensive architecture protects them from most mammalian herbivores, allowing them to thrive in disturbed soils, pastures, and roadsides across temperate regions worldwide.