How to Kill Mare's-tail Weed

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Mare's-tail is a common weed also known as horseweed. The plant is an annual that can appear in the spring or fall, reaching heights of 6 feet, with leaves that increase in size the farther down the plant you go. Some varieties of mare's-tail are resistant to glyphosate, one of the most common herbicides. This resistance is especially prevalent in the central United States.

Things You'll Need

  • Hand spade
  • Tiller
  • Metribuzin herbicide
  • Pull up any existing mare's-tail weeds in your yard by hand. Get up as much of the root system as possible. If the weeds are mature and do not come up easily, use a hand spade to dig them out.

  • Discard the weeds in the trash. Do not compost the weeds, because you may spread dormant seeds with the compost in the future.

  • Till the soil with a garden tiller at a depth of 12 inches. Tillage is the most effective method of mare's-tail control.

  • Apply a metribuzin herbicide to any regrowth that appears the following spring. Follow application instructions on the package. Apply the herbicide when the mare's-tail is 4 inches tall or less. Wait the instructed time for the herbicide to take effect, then till the soil again.

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