Stem

  • Up to 4 ft. tall, lacks hair (glabrous), waxy and branched near the top 
Photo of dalmatian toadflax

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 
Photo of dalmatian toadflax
 

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 
Photo of dalmatian toadflax
 

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

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Also of Interest:

 
Photo of Yellow toadflax plants with yellow flowers
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

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Master Gardeners of Nevada

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

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Master Gardeners of Washoe County

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

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Integrated Pest Management

Integrated Pest Management program is a long-term management strategy that uses a combination of tactics to reduce pests to tolerable levels with potentially lower costs for the pest manager and minimal effect on the environment.