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when should i dethatch my kentucky bluegrass

by Augustine Kreiger IV Published 2 years ago Updated 2 years ago
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Kentucky bluegrass should be dethatched in the spring (April) or fall (Sept.) when it is actively growing and never in the summer. Zoysiagrass, on the other hand, should be dethatched in the summer when it is actively growing.

Full Answer

When should I dethatch my lawn in Kentucky?

Dethatch cool-season grasses, such as Kentucky bluegrass, in late summer or early fall. Dethatch warm-season grasses, such as Bermudagrass or Zoysia grass, after spring green-up, as they enter early summer's peak growth.

When should I dethatch my Bermuda grass?

Dethatch warm-season grasses, such as Bermudagrass or Zoysia grass, after spring green-up, as they enter early summer's peak growth. Never dethatch when your lawn is dormant or stressed; you can damage it beyond recovery.

When is the best time of year to dethatch?

Then make sure you are dethatching in the season according to what grass you are growing, and should coincide with the major growth times. For Kentucky bluegrass, or other cool season grasses, the early fall or late summer is the best time to dethatch. For Zoysia grass or other warm season grasses, early summer is the best time to dethatch.

How do you dethatch Kentucky bluegrass?

Dethatch the Kentucky bluegrass when it is actively growing, at least 45 days before it begins to go dormant. Pull a dethatching rake over the soil surface in small areas, or rent a vertical mower, or dethatcher, to more efficiently break up the thatch layer in larger areas.

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What month should you dethatch your lawn?

The best time to dethatch your lawn is when it's actively growing and the soil is moderately moist. For cool-season grasses, that's early spring or early fall. For warm-season grasses, dethatch in late spring through early summer (after the second mowing). That's when your grass is growing most vigorously.

What happens if you dethatch too early?

Dethatching early in the spring may damage new crowns and to do so in early to mid-summer puts additional stress on the grass during hot, dry periods. Dethatching in mid-to-late fall is too late in the season because it leaves the grass weak and damaged during the winter and the lawn might not recover in the spring.

When should you not dethatch your lawn?

Never dethatch when your lawn is dormant or stressed; you can damage it beyond recovery. Lawn aeration and dethatching are two different processes, but they can work together to help your lawn.

Should I cut the grass before dethatching?

Avoid dethatching when the soil is saturated after heavy rainfall. The reason for this is that the dethatching equipment will pull the soil and tear at the roots instead of slicing and lifting the thatch. Mow the lawn to the lowest recommended height for your particular grass. Bag the clippings.

Is it OK to dethatch in early spring?

Early spring is one of the best times to dethatch because you are less likely to cause damage to new growth. Though a leaf rake can be used, thatching rakes have proven to be most effective.

Is it better to dethatch or aerate?

It is best to dethatch first before aerating your lawn. Aerating is best done when there's the problem of compaction. Both dethatching and aerating your lawn will improve air, nutrient, and water penetration into the root zone of your grass. Thatch is the main problem these two processes address.

Do I need to overseed after dethatching?

After dethatching, thatch should be removed and put in the compost pile. If you do not already have a compost pile, then you should seriously consider adding one. After this has been done, high-quality grass seed.

Do you have to rake after dethatching?

After dethatching, rake up the newly exposed thatch. Mowing your lawn will also help to clean things up. Fertilizing at this time is also important. This will help your lawn recover and get much needed nutrients.

Is a power rake and a dethatcher the same thing?

A dethatcher is a light-duty tool used to remove thatch that is up to 1/2-inch thick. A power rake is a heavy-duty garden tool primarily used by professional landscapers to lift and remove thatch that exceeds 1/2 inch in thickness.

What height do you dethatch?

about a quarter-inchYou want to remove thatch that is right above the soil without tearing it up. A height of about a quarter-inch (6.35 millimeters) above the soil may work -- adjust the blades while they are on a smooth surface. They may need to be slightly higher for delicate grasses.

Is dethatching bad for your lawn?

Spring dethatching hits a lawn hard when it is already in a precarious condition. Secondly, dethatching in the spring with power equipment can bring up crabgrass and other noxious weed seeds, setting your lawn up for a future infestation.

What does thatch look like in lawn?

0:062:28**WHAT IS THATCH IN YOUR LAWN?!?!?! - YouTubeYouTubeStart of suggested clipEnd of suggested clipThis is exactly what it looks like when thatch dies out it'll be very spotty. And it'll die inMoreThis is exactly what it looks like when thatch dies out it'll be very spotty. And it'll die in usually circle area so they'll be green green grass in between and this is all from thatch.

Is dethatching bad for your lawn?

Spring dethatching hits a lawn hard when it is already in a precarious condition. Secondly, dethatching in the spring with power equipment can bring up crabgrass and other noxious weed seeds, setting your lawn up for a future infestation.

Can you dethatch in the fall?

Dethatching in fall will make them weak in winter. The best time in most areas is late spring or early summer, when these grasses are growing and producing new runners. Cool season grasses such as bluegrass, fescue and ryegrass are less likely to need dethatching, but if they do, the best time tends to be early fall.

Does dethatching help your lawn?

Lawn dethatching can be crucial to keeping your grass and soil healthy. Even if you are mowing and doing everything else necessary for your lawn, thatch can build up. Over watering and over fertilization can cause excess thatch. Detaching removes the thick layer of dead plant material (thatch).

Should I aerate spring or fall?

The best time to aerate your lawn is in late summer or early fall, as this will allow your grass to recover completely before going dormant in the winter. While Fall is recommended, you can also aerate and overseed your lawn in the spring between March and May.

When to dethatch grass?

Active grass growth helps speed your lawn's recovery. Dethatch cool-season grasses, such as Kentucky bluegrass, in late summer or early fall. Dethatch warm-season grasses, such as Bermudagrass or Zoysia grass, after spring green-up, as they enter early summer's peak growth. Never dethatch when your lawn is dormant or stressed;

How to tell if your lawn has thatch?

Take a garden trowel or spade and dig up a small wedge of your lawn grass and soil. You'll be able to see and measure its thatch layer. If your thatch is 1–2 inches or more, you've probably already seen signs of poor grass color and weak, thin growth. Once you've confirmed your thatch exceeds the healthy mark, the time for dethatching has come.

What is Thatch?

If you've ever seen a cross-section of soil and grass roots, you've seen the layer of organic debris known as thatch. A mix of dead and living plant material , thatch forms at the base of grass plants, where stems meet roots and soil. Some organic matter, such as small grass clippings or mulched leaves, break down quickly in healthy lawns, but other materials take much longer to decompose. When buildup outpaces breakdown, your lawn's thatch layer grows thicker.

What is a manual dethatching rake?

Manual dethatching rakes are heavy, short-tined rakes with curved blades designed to dig into your lawn and pull up thatch as you rake. Dethatching rakes are good for light thatch and general thatch maintenance on small lawn areas.

Why is thatch a barrier?

Water from irrigation can accumulate in the thatch layer, too, so grass roots suffocate from lack of air.

What is thick thatch?

Thick thatch also provides a breeding ground for lawn disease and insect pests. Some lawn grasses are more prone to thatch buildup than other. Vigorous, spreading grasses such as Kentucky bluegrass, Bermudagrass and creeping fescues, may need regular dethatching.

How thick is a thatch layer?

A thin thatch layer, less than 1/2-inch thick , is beneficial to lawn health.1 It acts as an organic mulch to help conserve soil moisture and protect against big fluctuations in soil temperatures. A thin thatch layer allows water, nutrients and air to penetrate into soil and reach waiting plant roots.

When is the best time to dethatch grass?

For Kentucky bluegrass, or other cool season grasses, the early fall or late summer is the best time to dethatch. For Zoysia grass or other warm season grasses, early summer is the best time to dethatch.

What happens after dethatching a lawn?

After dethatching your lawn your work isn’t over. You will have a somewhat patchy, thin and slightly unhealthy looking lawn. It is quite important to get your lawn back to looking beautiful in all its green glory. After dethatching, plan to overseed your lawn.

Why Should I Dethatch My Lawn?

Thin layers of thatch allows water, nutrients and air to penetrate into the soil and reach the roots of your lawn , but too much thatch can do quite the opposite.

What tools do I need to dethatch my lawn?

Tools Used to Dethatch Your Lawn. If you decide to dethatch your lawn yourself, there are three main ways: Manual rakes, power rakes and vertical mowers. There are both positives and negatives to every dethatching tool and technique, so I’ll discuss those here, and share how I dethatch my lawn.

What is manual dethatching?

Manual dethatching is the most physically strenuous type of dethatching. This is done with a rake that has curved blades, and digs into your lawn as you dethatch. If you’re going to dethatch your lawn with a rake, invest in a dethatching rake (I own this one available on Amazon, and it works well).

What is the strongest tool to cut through thatch?

Being the strongest of the three DIY methods, vertical mowers slice through thatch layers and into the soil. These tools are similar to power rakes, but are much more powerful. Use a vertical mowers for thick thatch and lawns that need major work.

How thick is a thick thatch?

Lawn diseases also thrive in thick thatch. If you want a healthy and beautiful lawn, you will want to dethatch anytime your thatch is thicker than .75 inch. You can check this by taking a small garden trowel or a spade and digging up a section of your lawn to check the turf (you can replace it when you’re done).

What Is Dethatching a Lawn?

Dethatching is the mechanical removal of thatch, made up primarily of grass, leaves, stems, grass roots and lateral weed growth. It is usually done with a gasoline-powered or electric dethatching machine, but you can also do it by hand with a dethatching rake.

What grasses need to be dethatched?

Prime offenders include cool-season grasses like Creeping Bentgrass and Kentucky Bluegrass and warm-season grasses like Bermudagrass and Zoysiagrass, according to Harbit. For other types of grass, thatch builds up over time so you don’t need to dethatch annually.

Why is my lawn prone to rot?

Thatch inhibits nutrients, air and water from reaching the root layer of your lawn, resulting in a shallow root system and issues with fungus. Wet thatch can retain too much water during rainy seasons, leaving grass roots susceptible to rot.

How to measure thatch in grass?

You can dig up a small sample of turf with a trowel to measure the thickness of the thatch layer, or simply try to poke your finger through the grass into the soil. If the thatch is too dense to penetrate, you likely have a problem you need to address.

When do grass seeds germinate?

In most growing regions of the U.S., this means the spring or fall, when warm temperatures and ample precipitation promote rapid and hearty grass growth . “Try to avoid times of year when we would expect weed seed germination since the process of dethatching brings seeds to the surface,” adds Mann.

Can you remove excess thatch from lawn?

This is certainly a task most homeowners can tackle. “If you have a dethatching machine or rake and the time, you can remove the excess thatch yourself to restore the health of your grass, ” says Midwest Lawn Co. owner Eric Harbit. Before you dive into dethatching, however, read our overview to learn when, why and how often to take on your yard’s thatch layer.

Can grass die from a rake?

With so many wounds, grass plants may dry out and die.”. If your lawn is already compromised, dethatch with a rake or dethatching machine with rake tines. This method removes the layer of thatch without penetrating the soil beneath, so there is less chance of further damaging your grass.

Why You Need To Dethatch Your Lawn

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When You Should Dethatch Your Lawn

Ok, so now you know that removing thatch is an important step if you want a healthy and happy lawn, but when do you need to do this and how often?

The Different Ways to Dethatch

If your thatch is less than two inches and you want to learn how to do it as part of your regular lawn care regimen, then you should know there are a few different ways to approach the process and they will require specific tools.

What to Do After Pulling Up the Thatch

Whatever method you’ve chosen, it is important to follow up the dethatching with some lawn care.

What Are Some Steps to Keep Your Lawn Healthy Between Dethatching?

There are some helpful lawn care tricks you can use to keep everything healthy and to hopefully cut down on how often you need to dethatch your lawn.

Should You Dethatch Your Own Lawn?

Many homeowners will take pride in maintaining their own lawn. Following the steps above can help you to best take ownership in your lawn care and ensure that everything stays in tip top shape while you do it.

What temperature does Kentucky bluegrass grow?

Seeding and Overseeding. Kentucky bluegrass germinates best when soil temperatures range between 50°F and 65°F. That typically corresponds to daytime air temperatures of 60°F to 75°F.

What is Kentucky bluegrass?

Kentucky Bluegrass at a Glance 1 Cool-season lawn grass. 2 Suitable for northern lawns from coast to coast. 3 Excellent winter hardiness. 4 Some varieties susceptible to heat and drought. 5 Limited shade tolerance. 6 Excellent capacity for self-repair. 7 Some varieties vulnerable to stress damage.

Why does KBG need dethatching?

Because of its spreading growth, KBG develops thatch easily. Excess thatch amplifies drought stress and increases risks of brown patch and other lawn diseases. Depending on your mowing and lawn care practices, your KBG lawn may need dethatching every year or two. Fall aeration helps reduce soil compaction.

How high should a KBG mower be?

During periods of high heat and lower rainfall, increase KBG mowing heights to 3 to 4 inches. Never remove more than one-third of the blade in a single mowing.

How to get KBG free from leaf cover?

Mulch or rake leaves so your KBG is free from leaf cover.

What to do when your lawn thaws?

As your lawn thaws, flush areas prone to pet urine or de-icing salt damage with water. This helps prepare KBG for fast spring repairs.

When to apply Pennington UltraGreen Crabgrass Preventer Plus Fertilizer III 30-0-4?

Prevent new weeds and feed your established KBG lawn in early spring with Pennington UltraGreen Crabgrass Preventer Plus Fertilizer III 30-0-4. Apply this preemergent before crabgrass starts germinating — that happens as soil temperatures hit 55 degrees Fahrenheit. Do not treat seeded or overseeded areas until at least 60 days after seeding.

How long does it take for Kentucky bluegrass to dethatch?

Dethatch the Kentucky bluegrass when it is actively growing, at least 45 days before it begins to go dormant.

How to dethatch bluegrass?

Dethatch the Kentucky bluegrass when it is actively growing, at least 45 days before it begins to go dormant. Pull a dethatching rake over the soil surface in small areas, or rent a vertical mower, or dethatcher, to more efficiently break up the thatch layer in larger areas. Use a lawn rake to collect and dispose of the debris.

How to get rid of weeds in Kentucky?

Hand pull or dig up isolated weeds as soon as they appear to prevent weed establishment or further spread. Healthy, dense Kentucky bluegrass does not permit many weeds, and the spreading habit of this grass allows it to quickly colonize bare spots that once hosted weeds.

What is Kentucky bluegrass?

Kentucky bluegrass (Poa pratensis) is a cool-season perennial frequently used for turf areas and found across a broad area that covers U.S. Department of Agriculture plant hardiness zones 1 through 9. Individual cultivars vary in their hardiness, shade tolerance, heat tolerance and other characteristics.

Does Kentucky bluegrass need water?

Kentucky bluegrass growing in the shade requires less water than bluegrass in full sunlight. Watch for signs of water stress such as wilting, blue-gray discoloration, and imprints from footprints or other traffic remaining on the grass for longer than 30 minutes. Increase the frequency or amount of irrigation if needed.

Is Kentucky bluegrass invasive?

Although it is widely grown as a turfgrass species, Kentucky bluegrass is considered invasive in some areas and tends to invade disturbed areas rapidly, spreading by using both rhizomes and seed.

What is the best grass for a lawn?

One of the most popular grass choices, Kentucky Bluegrass, yields deep, dense, lush, medium blue-green, or dark-green turf. It is a cool-weather perennial grass that adapts well to varying climates, temperatures, and soils.

What do lawn clippings do?

Lawn clippings give nutrients like nitrogen back to the soil and lessen the need for chemical fertilizers. Always cut the lawn with a sharp mower blade. Dull blades yank at the grass instead of cutting and can pull it up by the roots. This creates damaged areas and unsightly, unhealthy patches.

Can you mow grass when it is wet?

Never mow grass when it is wet.

Do you need to gather grass clippings?

Let the clippings lie. There is no need to gather up grass clippings if the appropriate schedule of mowing is being followed. Mowing as needed and cutting 1/3 or less each time will create clippings that can easily be decomposed back into the lawn.

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