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.
Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. To contact a staff member at the King County Noxious Weed Control Program, please call 206-296-0290 or by reach them by email.
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.
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 Dalmatian toadflax.