It spreads both by seed and roots. This weed contains a poisonous glucoside that may be harmful to livestock . Yellow Toadflax grows under a wide range of environmental conditions. 2-inch long leaves. Stems are smooth, generally unbranched, and up to 3 feet tall.
Seed is produced in brown, globe-shaped capsules.
Seeds are round and dark colored with notched, papery collars that act as wings in spreading the seed. Herbicides are also available.