Kentucky Bluegrass Control

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Kentucky Bluegrass Control

Most Effective Products

Eraser 41% Glyphosate
Emulsifiable Concentrate (EC)
As low as $14.98
Keith's Pro Tips

"Herbicides will work best when the Kentucky bluegrass is young and actively growing. As the weed matures, they will be more resistant to chemicals which may require repeated applications."

Kentucky Bluegrass Control: How To Get Rid of Kentucky Bluegrass

This page is a general DIY guide for controlling Kentucky bluegrass. Using the products and methods suggested you get control of Kentucky bluegrass. Follow this DIY article and use the recommended products, and we guarantee 100% control of Kentucky bluegrass.

Kentucky bluegrass is a perennial, cool-season lawn grass. This means that it will come back year after year and grows most vigorously during the cool seasons of fall and spring. Kentucky bluegrass is found predominantly in northern climates where moderately warm summers and cold winters align with its natural preferences and growth cycle.

While Kentucky bluegrass has Kentucky in its name, this versatile and popular turfgrass was originally discovered in Europe and northern Asia. The grass was first introduced to the US as a pasture grass in states like Kentucky, hence why they earned their name. The grass is commonly known in by the initials KBG, and over the years has risen in popularity as an ideal grass type for residential and commercial landscapes because of its dark green color and beauty.

Even though it is a cool-season grass, KBG is versatile enough to thrive and survive in warmer conditions. Its not unusual to find Kentucky bluegrass growing in lawns in the West and Southwest parts of the country if they receive a lot of sun and the soil is exceptionally moist.

If you see Kentucky bluegrass on your lawn that you want gone, you can successfully remove KBG with the help of our DIY treatment guide. Our lawn care experts have compiled this guide to show you exactly what you need to remove Kentucky bluegrass from your lawn for good. Follow our step-by-step instructions below and use our recommended products to eliminate KBG quickly and affordably.


Before proceeding with a treatment program, you will need to be certain that you are dealing with a Kentucky bluegrass infestation. Careless identification can lead you to using the wrong treatment methods which can be a waste of time and money. Below are the following characteristics to know what Kentucky bluegrass looks like.

  • Kentucky bluegrass is a perennial cool-seasoned grass that grows in clumps up to 18-24 inches tall when unmowed. Stems will grow 1-2 feet in height when uncut. 
  • This plant features a deep emerald to blue green coloration and fine parallel-shaped leaf blades that reach 6 inches in length and up to 3 millimeters in width. Each blade has a curved tip.
  • When this plant flowers, the inflorescence starts as several spikelets that eventually take on a pyramid-like panicle shape.
  • From late spring to summer, the shoots of Kentucky bluegrass will become erect whereas in the early spring and fall they will become more reclined to the ground.

Use our description and image above to help you to identify Kentucky bluegrass on your lawn. If you are having trouble identifying your weed, contact us and we will properly ID the plant for you as well as give you product recommendations for control.


Once confirmed that you are dealing with Kentucky bluegrass, you can then move on to inspection. During this phase, you will locate areas where Kentucky bluegrass is thriving and observe the conditions that are allowing it to thrive. This information will help you in knowing where to focus your herbicide application.

Kentucky Bluegrass inspection

Where to Inspect

Kentucky bluegrass is found throughout the United States of America in areas with cool, moist weather and well-drained soils with a pH between 6 to 7. 

Common sites for this weed to be found are lawns, athletic fields, golf courses, pastures, meadows, open woods, rangelands, hay fields, roadsides, waste areas, and disturbed sites. 

What To Look For

When inspecting lawns, be sure to look out for discolored patches of turf that don’t match your desired turf cover.

This plant flowers from April to October so be sure to look for inflorescenes during this time.


Before chemical application, make sure to equip yourself with the proper personal protective equipment for your personal safety (glasses, gloves and particle mask).

Post-emergent herbicides such as Eraser 41% Glyphosate will help to remove Kentucky bluegrass due to its non-selective formulation. 

Keep in mind that this will kill all vegetation it comes into contact with. To avoid unwanted drift you can place a barrier such as cardboard box between the weed and desired vegetation. 

Step 1: Mix and Apply Eraser 41% Glyphosate

Determine how much Eraser 41% Glyphosate to use by measuring the square footage of the treatment area. To do this, measure the length and width of the treatment area in feet then multiply them together.

For spot applications with Eraser 41% Glyphosate, use 2 1/2 oz. (5 tbs) of product in 1 gallon of water to treat an area approximately 300 sq. ft. 

Mix and apply this product with a handheld pump sprayer. Be sure to mark this sprayer for Non-Selective Herbicide Use Only to prevent cross-contamination in the future.

Fill the sprayer tank with half the amount of water, add the measured amount of Eraser 41% Glyphosate, then pour in the remaining half of water. Close the tank lid and shake until evenly mixed. 

Once mixed, spray the top and bottom of the weed leaves until wet, but not to the point of runoff. 

Step 2: Reapply if Needed

Kentucky bluegrass treated with Eraser 41% Glyphosate will die off within 2-4 days, but may take 1-2 weeks for complete death to occur. 

If you are still encountering this weed, then a second application can be done when 4 weeks have passed from the previous application. 

If you are spraying Kentucky Bluegrass in turf, the surrounding grass may be injured and may need to be reseeded.


Once Kentucky bluegrass has been eliminated from your property, you will need to implement some preventative measures which will ensure that this weed does not return.

Mowing the grass

  • Promote the health of your turf to reduce the conducive conditions that allow weeds and disease to take hold.
  • Mow your grass at proper intervals to maintain a thick growing density. A lawn dense with taller trimmed grass is better able to choke out weeds and prevent them from establishing.
  • Reduce the shade cast on your lawn by trimming overgrown shrubbery and tree branches, rake away leaf litter and pick up any debris, and employ a proper watering schedule to provide the local grass with enough water to strengthen its roots, but not so much that will encourage weeds. Many grasses require 1 inch of water every week. Apply the water all at once in the morning so it has time to seep into the ground without evaporating in the sun.

Key Takeaways

What is Kentucky Bluegrass?

  • Kentucky bluegrass is a popular cool-season grass that can take over where it's not wanted and once established it can be very hard to remove.

How to Get Rid of Kentucky Bluegrass

  • We recommend either using a post-emergent treatment of Eraser 41% Glyphosate. 

Preventing Kentucky Bluegrass Reinfestations

  • To prevent a return of Kentucky bluegrass, practice cultural methods of control (water infrequently, mow grass low).
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