Stem

  • Up to 4 ft. tall and covered with long hairs
Photo of houndstongue plant in the grass
 

Leaves

  • Alternate; resemble a hound’s tongue; lance-shaped, 1-12 in. long, 1-3 in. wide, rough texture and covered with long hairs; edges (margins) lack teeth and lobes
  • Leaf stems (petioles) on lower but not upper leaves; leaves decrease in size from bottom to top of plant 
Photo of houndstongue plant

 

Flower

  • Purplish-red flowers with 5 petals; occur in clusters
  • 4 nutlets (seeds) per flower, 0.25 in. long and brownish at maturity; covered with short prickles that can attach to clothing or animal fur 
Photo of houndstongue plant with dark red flowers
 

Root

  • Thick, deep taproot
Photo of houndstongue plant with small purple flowers
 

 

Other

  • Grows best in moist areas; often found in pastures, roadsides, fencelines, waste areas and along waterways; known to occur in Elko, Lincoln and White Pine counties
  • Biennial, but sometimes annual or perennial; reproduces by seed
  • Toxic to livestock, especially horses; has a distinctive odor that may cause animals to avoid
Photo of houndstongue seeds on shoelaces
Photo of houndstongue seeds

Control

  • Mowing or tillage prior to seed production is effective
  • Apply 2,4-D or glyphosate to actively growing plants prior to bloom; aminopyralid, chlorsulfuron, imazapic, imazapyr, metsulfuron or picloram pre- to post emergence
Blecker, L., Creech, E., Dick, J., Gephart, S., Hefner, M., Kratsch, H., Moe, A., Schultz, B. 2020, Nevada Noxious Weed Field Guide – Houndstongue, Extension, University of Nevada, Reno, Field Guide

Learn more about the author(s)

 

Also of Interest:

 
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Davison, J., Powell, P., Schultz, B., and Singletary, L. 2012, University of Nevada Cooperative Extension
Nevada’s Priority Agricultural Weeds: Hoary Cress
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B. Schultz, S. Foster 2021, Extension, University of Nevada, Reno, SP-21-03
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Blecker, L., Creech, E., Dick, J., Gephart, S., Hefner, M., H. Kratsch, Moe, A., Schultz, B. 2020, Extension, University of Nevada, Reno, Field Guide
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Blecker, L., Creech, E., Dick, J., Gephart, S., Hefner, M., Kratsch, H., Moe, A., Schultz, B. 2020, Extension, University of Nevada, Reno, Field Guide
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Nevada Noxious Weed Field Guide – Common St. Johnswort
Common St. Johnswort 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
 

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