How to Gid Rid of Annual Bluegrass
Annual bluegrass (Poa annua) is an invasive weed that can produce seeds even through repeated mowing. Annual bluegrass has two varieties: One is a true annual that dies at the end of the season in the spring; the other is a persistent perennial. While the annual version only lasts for one season, it is a heavy seeder, and still presents ongoing weed issues. The only effective method for getting rid of annual bluegrass, other than hand weeding, is through the use of herbicides. Does this Spark an idea?
Things You'll Need
- Garden sprayer
- Pre-emergent herbicide containing both benefiin and trifluralin
- Water
- Herbicide containing glyphosate (optional)
Instructions
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Fill a large sprayer with a pre-emergent herbicide that has both benefiin and trifluralin as the active ingredients. Refer to the manufacturer's directions for the proper dosage, and add in water to the sprayer, per the instructions, to dilute it to the proper concentration. Close the sprayer up and shake it gently for 20 to 30 seconds.
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Spray the herbicide mixture over the entire surface of the soil until it is damp.
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Apply a second application of herbicide in the same dosage and in the same manner 10 to 12 weeks after the first application.
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Tips & Warnings
Apply the herbicides in the fall when daytime temperatures fall to approximately 75 degrees F for four days in a row. This is the best time to treat your lawn to prevent new annual bluegrass seeds from sprouting.
Once annual bluegrass weeds are tall enough to be noticeable, they are almost at the end of the life cycle, and treating them serves no purpose. If you desire to kill mature plants, spray them with an herbicide containing glyphosate.
Herbicides containing glyphosate are non-selective herbicides that will kill other grass and vegetation.
