Weed of the Week: Horseweed

Horseweed (Conyza canadensis):

Often times called: mare’s tail. Warm season erect annual weed. Often found in cultivated areas, pastures, road sides and waste sites. First leaves are in a rosette. Stem with frequent alternate and sessile leaves. Horseweed generally bolts in April/May, flowers in July and sets and disperse seed from August to October. Control of horseweed is more effective when plants are in the rosette stage or less than 2 inches tall.


Horseweed Flower

Horseweed Flower



Young Horseweed

Young Horseweed




Select Herbicide Options:


2, 4-D

GrazonNext HL


Grazon P+D

Pasturall HL


Chaparral (for bermudagrass pastures, will destroy bahiagrass)


REMEMBER: THE LABEL IS THE LAW!  Always read the pesticide label before using.



Vanessa Corriher-Olson

Professor, Forage Extension Specialist

Texas A&M AgriLife Extension

Overton, TX

Soil & Crop Sciences Department


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