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Noxious Weeds

Yellow Toadflax

Yellow toadflax, sometimes known as “butter and eggs,” is a native of Eurasia that was introduced to the U.S. in the mid-1800s as an ornamental. An aggressive invader of rangelands, it displaces desirable grasses. It is also found along roadsides, waste places and cultivated fields.

Growth Habit: Creeping perennial, sometimes over 3 feet tall.

Leaves: Long and narrow, numerous, pale green, smooth and pointed, attached directly to the stem. Seedlings resemble miniature spruce trees.

Flowers: Snapdragon type, 1 to 1½ inches long with spur, bright yellow with deep orange center. Each plant can produce up to 30,000 seeds.

Roots: Woody, vigorous, well branched with many laterals.

Other: Yellow toadflax contains a poisonous glucoside that may be harmful to livestock.

Status: State Designated Noxious Weed, Category 1 Fremont County. Rare. No tolerance, with a goal of early detection and eradication.

Control: An extensive root system makes this plant difficult to control. It is best treated with herbicides. FCWP offers a 40 percent Cost Share on chemicals for controlling this species. Contact your local weed and pest office for further treatment recommendations.

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Steve Dewey, Utah State University, Bugwood.org

Steve Dewey, Utah State University, Bugwood.org