For Bermuda grass enthusiasts, the term “scalping” isn’t as scary as it sounds. In fact, it’s a crucial part of lawn care that can set the stage for a lush, green carpet of Bermuda grass. Scalping is the process of cutting your Bermuda grass much lower than its recommended height, essentially removing the dormant, brown top layer to expose the green, growing part of the grass. This technique is a specialized practice that should not be used regularly. However, if performed properly, this technique can be useful. Scalping will remove dead grass, buildup, thatch, and debris and help the soil to warm up faster. Faster soil warm-up means the new growth will occur sooner rather than later, often making your lawn an early riser and the envy of the neighborhood!
In the summer, your lawn may start to appear more brown, even with sufficient watering. Scalping your lawn isn’t something you do every week, but when done right, it can dramatically improve your grass health and kickstart spring green-up. If you have never tried this technique before, you may wonder how to scalp without stressing or damaging your turf. This guide will walk you through everything step-by-step. Just keep in mind that scalping is a spring prep technique that works only on Bermuda and Zoysia lawns. And if you’d rather skip the work altogether, you can always hire a lawn care pro to handle the scalping for you.
What is Lawn Scalping?
Scalping is cutting your grass much shorter than the usual one-third rule to remove the old layer of dormant growth sitting on top. You’re essentially cutting it down to expose the stems and crowns of the grass, and sometimes even glimpsing the soil beneath. This isn’t your regular weekly mow. Scalping is only for Bermudagrass and Zoysiagrass that spread by above-ground stolons and below-ground rhizomes. Even if you cut them hard, they can bounce back quickly as the weather starts to warm up. You shouldn’t scalp other warm-season grasses like St. Augustine and centipedegrass, or any cool-season grasses, because they don’t have the growth structure to recover from such a low cut. If you’re renovating, you can scalp any grass type since it’s already dead or being removed.
Scalping, in layman’s terms, is getting your mower as close to the dirt as possible. It involves lowering the mower blades to the lowest setting without hitting the soil. Cutting low lets the sunshine in, and warm-season grass loves that. The dormant grass is your lawn’s winter armor, shielding it from those late-season frosts or freezes.
Why Scalp Your Lawn?
Lawn scalping involves cutting your grass at the lowest or nearly the lowest setting on your mower in order to remove dormant grass and promote spring growth. When a customer calls in to tell us that his lawn’s not as green as his neighbor’s, the first thing we ask is, ‘Have you scalped your lawn yet?’
Growth Promotion
Bermuda grass lies dormant during the winter, so scalping can help jumpstart its transition into spring growth. Cutting your lawn really short in the spring lets more sunlight get to that soil and warms it up faster, helping the grass come out of winter dormancy. Scalping allows more sunlight to reach the soil, providing a warmer and more inviting environment for your grass to start growing earlier in the season. This is a natural way to encourage a healthy spring green-up without the need for chemical fertilizers.
Disease Control and Thatch Reduction
Not only does lawn scalping promote growth, but it also thwarts diseases. Scalping your lawn eliminates a layer of thatch, and thatch holds moisture. Unless it is removed in the spring, it will provide a haven for diseases in your yard. Scalping removes dead grass blades and thatch buildup, allowing sunlight and air to reach the soil more effectively. This stimulates new growth at the base of the grass plants, resulting in a thicker, healthier lawn. Thatch is a layer of dead grass stems and organic matter that accumulates at the base of the grass blades. Over time, excessive thatch can prevent water and nutrients from reaching the roots. Scalping helps remove thatch, improving overall lawn health. By removing dead grass and debris through scalping, you can minimize the risk of fungal diseases and pests that often thrive in decaying organic matter.
Improved Absorption and Overseeding
Removing excess thatch allows for better water infiltration and airflow to the roots. This can improve your lawn’s resilience during hot summers and periods of drought. The shorter grass after scalping also aids in fertilizers penetrating deeper into the soil, ensuring it receives the essential nutrients and pre-emergent herbicides it needs. If you’re planning on overseeding your lawn to fill in bare spots or introduce new grass varieties, scalping ensures that your newly sown seeds have direct access to the soil, increasing their chances of germination and successful growth.
Weed Management
Scalping exposes existing weeds and weed seeds near the surface, making them easier to remove manually or with herbicide application. When it comes out of dormancy, a scalped lawn promotes lower, denser grass that squeezes out many weeds trying to grow.
When to Scalp Your Lawn
Timing is everything with lawn scalping. For Bermuda and Zoysia lawns, the sweet spot is early spring when your grass is still dormant, but temperatures are warming up. These grasses start pushing new root growth when soil temperatures reach 60 to 65 degrees Fahrenheit. Use a soil thermometer to check the temperature. Insert it 3 to 4 inches into the soil, and take readings in both sunny and shaded areas for the most accurate results. Test for three consecutive days before scalping because soil temperatures can fluctuate.
The ideal time to scalp is late February through mid-March in most southern regions. If you’re in the transition zone, wait until late March to mid-April. Exact timing depends on your local climate, so watch for these signs:
- Grass is still brown and dormant
- No frost is forecast for at least a week
- Daytime temperatures are consistently warming
- You’re about two to four weeks from green-up
Avoid scalping too early or too late. Too early exposes your lawn to potential frost damage. Too late means you’ll cut off new green growth, defeating the entire purpose. As a general rule, however, you should only scalp your lawn when the danger of a hard freeze has passed. Scalp your lawn too late, on the other hand, and you will miss out on the benefits of healthy spring growth. Tom also recommends scalping your lawn when your grass is relatively dry. Aim to scalp the lawn on a dry and non-windy day.
Warm season grasses such as Bermuda or Zoysia must be scalped in early spring before they come out of winter dormancy (generally the last half of March in Oklahoma). If your lawn is Zoysia and has not entered into a fully dormant state over the winter, the extra stress on the lawn may not promote a healthy green-up as it would if it were fully dormant. Do not scalp any fescue grass ever. Fescue is cool season grass that grows in shady areas.
Select the Right Lawn Mower and Equipment
The right equipment makes all the difference when scalping. Here’s what you’ll need:
- For scalping to ½ inch: Use a reel mower. Reel mowers use a scissor-like cutting action that can safely go extremely low without tearing the grass. They’re the gold standard for achieving that crisp, low cut.
- For scalping to 1 inch: Most rotary mowers can get close. Look for models that cut under 1½ inches. Set your rotary mower to its absolute lowest setting, even if it doesn’t quite reach the ideal 1 inch-mark. If you don’t have a reel mower, that’s okay. Work with what you have. A rotary mower at its lowest height will still get the job done.
Whatever mower you choose, start with sharp mower blades. If you didn’t sharpen your mower blades before winter, now is a good time to do it before the mowing season begins. Dull blades rip and tear the grass, which leaves the grass looking ragged and hazy after a mow, and those frayed edges are more vulnerable to disease and fungus. Besides the mower, here are some other equipment you’ll need:
- Bagging attachment or a wheelbarrow for collecting debris
- A rake for clearing sticks and debris beforehand
- A dust mask or face covering (scalping kicks up a lot of dust)
- Green waste bags if your mower doesn’t have a bagger
Lubricating the reel with vegetable oil before scalping minimizes wear on the reel bearings and components, reducing heat and potential damage to the blade, especially when mowing brown grass with reduced moisture content.
Set Your Mower to the Right Height
Scalping is cutting your grass lower than usual, but you don’t want to scrape the soil. The right height for scalping Bermudagrass is 0.5 to 1 inch, while for Zoysiagrass it’s between 0.75 and 1.25 inches. Zoysia is slightly higher because it takes longer to recover. The recommended cutting height for scalping with a reel mower varies from lawn to lawn, depending on how smooth the lawn is. The goal is to scalp down 1/4″ to 1/2″ below where you want to maintain the turf throughout the season. Different grass types have varying optimal cutting heights. Research the specific type of grass in your lawn and set the mower height accordingly.
Pro Tip: If your lawn is significantly overgrown, consider gradually lowering the cutting height in multiple passes rather than making a drastic change in a single mowing session.
Prep Your Lawn for Scalping
Trying to run your mower on a lawn covered with debris can damage the mower blades. Before cutting, walk your lawn and get rid of any leaves, sticks, small rocks, and fallen branches. Pick up anything the mower could catch and throw. Before you begin mowing, ensure that the gas-powered reel mower has a full fuel tank. Before mowing the entire lawn, check your reel-to-bedknife contact. For scalping, you want the reel to have little to no contact with the bedknife.
Scalp in Passes and Bag the Clippings
Don’t try to scalp from 3 inches to ½ inch in one pass. Lower your cutting height over several passes and overlap each patch by about 4 inches. This approach is easier on your mower and helps you avoid scalping too aggressively in low spots while missing high spots. For example, if your grass is currently 2 to 3 inches tall and you want to scalp to 1 inch, make your first pass at 1.75 inches, your second at 1.25 inches, and your final pass at 1 inch.
Make sure to wear a dust mask, as scalping dormant grass can kick up a lot of dust that can irritate your eyes and airways. Unlike regular mowing, you don’t want to leave scalped grass on your lawn. The whole point of scalping is to remove dead material, so bag everything up as you mow. Remove any thick clumps your mower missed, thatch pockets, and any other debris. The cleaner your lawn is after scalping, the faster it’ll green up.
All of that crunchy, brown lawn debris does not belong in your yard! This is one of those rare occasions when you should bag your clippings. Once the new grass grows in, cut it at the proper height for your grass type. This typically means you should remove roughly ⅓ of the length on each mowing, cutting it down to 2” to 3”.
Do: Take caution to not overdo scalping on lawns with heavy thatch-especially on St. Augustine grass.
Don’t: Bag this material and send it to the landfill. Landfills are not appropriate sites for disposing of yard waste.
How I TRANSFORMED My Lawn // Tall Cut Grass to Short Cut Grass
Water Your Lawn to Help It Recover
Water your lawn with about an inch of water immediately after scalping to reduce stress and help kickstart new growth. After that, water lightly a few times per week until the turf begins to green. Once your lawn starts actively growing, switch to a regular schedule of 1 to 1.5 inches of water per week.
Feed Your Grass (Optional)
Fertilizing your turf can give it a nutrient boost as it begins growing, but wait until early to mid-April when you see the first signs of green so the grass can actually use the nutrients. Choose a slow-release nitrogen fertilizer.
Post-Scalping Care and Maintenance
After scalping, your lawn is in prime condition for a soil test. Based on the results of the soil test, consider amending your soil with the necessary nutrients or adjusting its pH level to promote healthy grass growth. Soil test results take two to three weeks, and you should apply the recommended nutrients the moment you see green grass starting to push up. Following a scalp in February or early March, schedule blade sharpening and any necessary repairs in April before the first mow of the season. For those who prefer hands-on maintenance, post-scalping tasks include backlapping blades, checking belts, chains, and screws, and replacing the spark plug, air filter, and oil to ensure your mower is ready for the mowing season.
A scalped lawn is also more vulnerable to weeds, so it is recommended to apply a pre-emergent herbicide right after scalping to prevent new weeds from sprouting.
Frequently Asked Questions About Lawn Scalping
How long does it take scalped grass to recover?
Most Bermuda and Zoysia lawns begin showing new growth within two to three weeks after scalping, but full recovery to a lush, green lawn can take four to six weeks.
Should I scalp my lawn before overseeding?
If you’re overseeding to fill in bare patches, you only need to mow your lawn a bit shorter than usual. However, if you’re renovating, you should scalp to remove dead debris and improve seed-to-soil contact.
Can scalping damage my lawn?
Scalping doesn’t damage Bermuda and Zoysia lawns when you do it at the right time. However, scalping cool-season grasses, cutting too early when frost is still possible, or scalping other warm-season grasses that only grow from stolons can severely stress your turf.
When should I resume normal mowing?
Once your grass greens up and reaches your target height, you can return to regular mowing. Bermudagrass does best at 1.5 to 2 inches, and Zoysiagrass at 2 to 2.5 inches.
Can you scalp Kentucky Bluegrass?
No, you should not scalp Kentucky bluegrass or any other cool-season type of grass, like fescue. Scalping is most suitable for warm-season grasses, more specifically, Bermudagrass and Zoysia lawns. Cool-season grasses have different growth patterns and do not benefit from the same scalping approach.
Is scalping the same as dethatching?
No, scalping is not the same as dethatching. Scalping involves mowing your grass as short as possible to promote spring growth. In contrast, dethatching refers to removing the layer of dead and living grass shoots, stems, and roots that accumulate between the soil and the grass blades. While both practices contribute to a healthier lawn, they serve distinct purposes in lawn maintenance.
Calling a Professional
In the quest for the perfect yard, scalping a lawn can be a powerful strategy for homeowners. However, the key to successful scalping lies in choosing the right moment. Misjudging this critical timing can lead to unintended consequences, stressing your grass and hindering its growth rather than fostering the green carpet you envisioned. If you want to ensure that you’re doing everything right, consider reaching out to a local lawn care professional. Their expertise can be invaluable in getting your lawn ready for spring.