Thistles, Johnsongrass and Shattercane have been declared prohibited noxious weeds in Maryland.  These weeds must be controlled by anyone owning or managing land within the State.  Seeds from these noxious weeds are transported by wind, water and man once the plants have matured.  These weeds threaten the productive land of farmers and cause insightly and unwanted problems in lawns and gardens of homeowners.

General control practices include mowing, cultivation and/or treatment with approved herbicide.