This weed, native to the Mediterranean, is an aggressive rangeland pest where it displaces forage plants and makes access difficult. Distaff thistle has spiny flower heads, and the leaves have long, stout marginal spines that make this plant a painful invader. Distaff thistle is a winter annual, germinating in fall but not maturing to produce seed until the following summer. It reproduces only by seed, which can be spread by wind, animals, and vehicles, creating new infestations.

Distaff thistle is a common problem in the coastal canyons of San Luis Obispo County, but is rarely found east of the Santa Lucia Range. Certain cultural techniques, such as mowing or removing plants just prior to flower formation, have provided adequate control. Chemical treatment with a broadleaf selective herbicide, in order to promote surrounding grasses, has also worked effectively; for best results, applications should be made early in the growing season (February through April) when plants are relatively small.