History and Impact
This exotic invader from the Mediterranean region was introduced as an ornamental. Dalmatian toadflax has no value as food, and crowds out valuable forage. The plants are reported to contain a poisonous glucoside and may be harmful to livestock.

Biology and Morphology
A shortlived perennial, up to 5 feet tall, Dalmatian toadflax spreads by seed and lateral roots. Its leaves are light green, dense, alternate, and heart-shaped; its upper leaves are broad-based. Snapdragon-type flowers are bright yellow tinged with orange and are 1 to 1.5 inches long. Seed pods, flowers and flower buds are often present at the same time.

The vertical roots are large, rough, somewhat branching, and may extend down 6 feet or more. Long slender lateral roots branch from the vertical roots and may extend 10 feet or more, remaining close to the soil surface. Buds that develop on the lateral roots produce new shoots.

For more information about Dalmatian toadflax, please see the written findings of the WA State Noxious Weed Control Board.

If you find Dalmatian toadflax in King County, please notify us through our online infestation form.

To find out where we have records of this weed in King County, use our interactive noxious weed map and search for Dalmatian toadflax.