There are three basic varieties of bluegrass, including Kentucky bluegrass, annual bluegrass and rough bluegrass. Of these three varieties, annual and rough bluegrass are considered weeds because they are lighter in color than other grasses and they grow rapidly. Some bluegrass plants are perennials and return yearly, while others are annuals and last only one season. If you desire complete eradication, killing the grass is the best option.
Things You'll Need
- Pre-emergent herbicide
- Garden sprayer
- Post-emergent herbicide
Apply a pre-emergent herbicide made for bluegrass to the entire surface of the lawn in early August. Fill a garden sprayer with the pre-emergent liquid and point the tip of the sprayer at the bluegrass. Spray the herbicide onto the soil, not the grass blades, until it completely saturates the surface of the soil to keep any existing bluegrass seeds in the soil from sprouting.
Apply a post-emergent herbicide in early September. Fill a garden sprayer with the herbicide and point the tip of the sprayer at the bluegrass. Spray the herbicide onto the grass until it completely saturates the blades of the grass.
Wait four weeks and apply a second application of post-emergent herbicide to the bluegrass to kill of any grass that survived the first application.
Tips & Warnings
- Do not apply the herbicide spray when rain is expected for at least two days, as it will wash away the chemicals.
- If you choose an herbicide formulated for bluegrass, it should not harm the remaining grass in the lawn.
- Photo Credit Hemera Technologies/AbleStock.com/Getty Images
How to Get Rid of Poa Annua Grass
Poa annua is a type of bluegrass that is considered an invasive weed species in many turf grasses. It is problematic for...
How to Kill Poana Grass
Poa annua, sometimes spelled as poana, is an annual bluegrass species. While pulling the invading grass from your outdoor space is one...
How to Kill Fescue Grass
Fescue grass can rise from the soil to become a blight in many lawns and gardens. Fescue grass grows in clumps, which...
How to Get Rid of Foxtails in the Grass
Foxtails (Setaria spp.) have bushy, seed-filled flower heads that captivate children and birds, but these grassy weeds don't charm turf enthusiasts. The...
How to Get Rid of Clover Without Hurting the Grass
Clover has become one of the most prominent annual broadleaf weeds in the northern United States since the 1940s and 1950s, when...
Herbicides for Poa Annua
Poa annua, more commonly known as annual bluegrass, is one of the most common weeds invading lawns and gardens in the United...