Mechanical Control

Biological Control

Herbicides are very effective for controlling established musk thistle infestations, if applied in the rosette stage and before bolted plants begin to bloom. Musk thistle can produce viable seed if herbicides are applied after buds are formed.

Plants should be actively growing when herbicides are applied, such as during the early spring. Late fall treatments are also effective.

Several chemicals are approved for the control of musk thistle in pastures, rangeland, and non-crop areas. Commonly used herbicides include 2,4-D and Tordon® 22K (picloram). Roundup® (glyphosate) can be used to treat isolated plants.