Controlled grazing on annual grassland decreases yellow starthistle

Livestock grazing in late spring and early summer resulted in large reductions of yellow starthistle, Centaurea solstitialis, on infested annual grasslands. Grazing in the bolting stage before spines developed reduced starthistle's canopy size, seed production and thatch accumulation and enhanced native plant diversity. Property timed grazing effectively manages starthistle on a seasonal basis but does not eliminate populations.