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Yellow Toadflax
Life cycle: Perennial
Leaves: Pale green, slender, and pointed
Stems: Few if any branches. Hairless to having sparsely distributed long soft hairs
Flowers: Yellow with an orange center. Similar to wild snapdragons or butter-and-eggs.
Roots: Vast, creeping, horizontal-underground roots
Comments: Local noxious weed. May be found in patches in lawn because it spreads by creeping roots. Very difficult weed to control with herbicides. Long-term program often needed. Seedlings look like leafy spurge, but do not have milky sap.
Control
Cultural: Continuous clipping to prevent seed production.
Foliar Herbicides: Fall applications preferred for this perennial weed. In lawns, products that contain 2,4-D and dicamba (Weed-B-Gone Max, Trimec, WeedStop, and others), triclopyr (Turflon), or clopyralid (Confront) may provide suppression.
Yellow Toadflax
Life cycle: Local noxious. Perennial.
Leaves: Pale green, numerous, narrow, pointed at both ends, 2 ½ inches long.
Stems: Erect, 1 to 2 feet tall, sparse hairs or smooth.
Flowers: Yellow to pale cream, about 1 inch long; long, bearded throat with straight spur.
Weed Species: local noxious weed
Comments: Difficult to control, mildly poisonous to livestock.