Stem

Up to 4 ft. tall, lacks hair (glabrous), waxy and branched near the top

Leaves

Alternate and dense; lance-shaped to heart-shaped, 1-2.5 in. long, blue-green color, lack hair and waxy; bases clasp the stem; edges (margins) are smooth

Flower

Snapdragon-like; 1.5-2 in. long; yellow with an orange-bearded throat and a long spur; clustered along upper part of stem
Seed capsules round (less than 0.3 in. diameter) with two chambers, each containing many seeds

Root

Creeping root system

Photo of dalmatian toadflax plant in front of a lake.

Other

Grows best in dry, well-drained soils; often infests rangelands, waste areas and roadsides; known to occur in Douglas, Elko, Lincoln, Nye and White Pine counties
Perennial; reproduces by seed and roots
May be toxic to livestock if ingested in large quantities

Control

Mechanical control (mowing, burning or tillage) is NOT effective
Several biological control agents are available
Apply aminocyclopyrachlor, chlorsulfuron, imazapic or picloram pre-emergence through bloom or to fall rosettes; repeated applications of 2,4-D, dicamba or glyphosate to actively growing plants

Blecker, L., Creech, E., Dick, J., Gephart, S., Hefner, M., Kratsch, H., Moe, A., Schultz, B. 2020, Nevada Noxious Weed Field Guide – Dalmatian toadflax, Extension, University of Nevada, Reno, Field Guide

Extension Associated Contacts

Heidi Kratsch

Also of Interest:


Nevada Noxious Weed Field Guide – Yellow toadflax Yellow toadflax is a noxious weed that has been identified by the state of Nevada to be harmful to agriculture, the general public, or the environment. Learn more about this weed. Blecker, L., Creech, E., Dick, J., Gephart, S., Hefner, M., Kratsch, H., Moe, A., Schultz, B. 2020, Extension, University of Nevada, Reno, Field Guide

Associated Programs

Master Gardeners of Nevada

Program trains local gardeners to provide research-based horticulture information to Nevadans

Master Gardeners of Washoe County

Master Gardeners provide free, research-based horticulture information to Nevadans.

Master Gardeners of Douglas County

Learn about the Master Gardener program in Douglas County, Nevada.

Nevada Noxious Weed Field Guide – Dalmatian toadflax