Killing Weeds In Zoysia Grass – Reclaim Your Lush, Velvet Lawn

ByRimon Chowdhury Updated on

We all love the feeling of a thick, carpet-like Zoysia lawn under our bare feet, but seeing aggressive weeds poke through that emerald green can be incredibly frustrating. You have worked hard to establish your turf, and it feels like those invaders are trying to take over your weekend relaxation time.

Don’t worry—getting your lawn back to its pristine state is easier than you think once you understand how this specific grass variety behaves. In this guide, I will show you exactly how to handle killing weeds in zoysia grass without damaging your beautiful turf, ensuring it stays healthy and vibrant all season long.

We are going to cover everything from identifying your “uninvited guests” to choosing the right treatments and adjusting your mowing habits. By the time you finish reading, you will have a professional-grade battle plan to keep your lawn looking like a golf course fairway.

Understanding the Unique Nature of Zoysia Turf

Zoysia is a warm-season grass known for its incredible density and drought tolerance. Because it grows so thick, it actually acts as its own natural weed barrier by choking out many competitors before they can even start.

However, Zoysia is also a slow grower compared to Bermuda or St. Augustine. This means if you use the wrong chemical or pull weeds too aggressively, the “bald spots” left behind will take a long time to fill back in, giving new weeds a chance to sprout.

When you are killing weeds in zoysia grass, you have to be more surgical than you would with other grass types. You want to eliminate the weed while providing the best possible environment for the Zoysia stolons (above-ground runners) to spread and heal the area.

The Growth Cycle Factor

Zoysia goes dormant in the winter, turning a light tan color. During this period, the grass isn’t growing, but many winter weeds are thriving. This creates a unique window where you can treat weeds more easily without the grass “fighting” for nutrients.

On the flip side, during the “green-up” phase in spring, the grass is very sensitive. Applying heavy chemicals during this transition can cause stunting or yellowing, which is why timing is the most important tool in your gardening shed.

The Best Timing for killing weeds in zoysia grass

Timing is everything when it comes to maintaining a clean lawn. If you spray at the wrong temperature or during the wrong growth phase, you might end up doing more harm to your grass than to the weeds themselves.

For most homeowners, the best time to tackle weeds is in the early spring and early fall. These are the transition periods when weeds are either just starting to germinate or are preparing to hunker down for the winter.

When killing weeds in zoysia grass, always check the outdoor temperature. Most liquid herbicides should not be applied when temperatures exceed 85 degrees Fahrenheit, as the heat can cause the chemical to stress or “burn” your Zoysia blades.

Spring Strategy: The Pre-Emergent Window

The old saying “an ounce of prevention is worth a pound of cure” perfectly describes spring lawn care. Your goal here is to stop weed seeds from ever becoming plants.

You should apply a pre-emergent herbicide when soil temperatures consistently reach 55 degrees. This is usually around the time forsythia bushes start blooming in your neighborhood. This creates a chemical vapor barrier that stops crabgrass and other annuals in their tracks.

Fall Strategy: Winter Weed Prevention

In the fall, you are looking to stop winter annuals like Henbit and Chickweed. Apply your second round of pre-emergent as the temperatures begin to drop but before the first frost hits.

This prevents those annoying little purple and white flowers from popping up in your dormant brown lawn during January and February. It keeps the lawn looking “clean” even when the grass is sleeping.

Identifying Common Weeds in Your Zoysia Lawn

You cannot effectively fight an enemy you haven’t identified. Weeds generally fall into three categories: broadleaf, grassy, and sedges. Each one requires a slightly different approach for successful removal.

Broadleaf weeds are the easiest to spot. They have wide leaves with veins that branch out, like dandelions or clover. Most “weed and feed” products are designed specifically to target these without hurting your grass.

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Grassy weeds are trickier because they look like your lawn. Crabgrass is the most famous example. To kill these, you often need selective herbicides that can tell the difference between a weed and your Zoysia.

The Troublesome Nutsedge

Nutsedge is not a grass; it is a sedge. It grows faster than Zoysia and has a triangular stem. If you try to pull it by hand, you will likely leave behind small “nutlets” in the soil that will just sprout two more plants.

For sedges, you need a specific product containing Sedgehammer or Sulfentrazone. Regular broadleaf killers will not touch it, so don’t waste your money on general sprays if you see these bright green, waxy stalks.

Crabgrass and Goosegrass

These grassy invaders love thin spots in your lawn. They grow in a star-like pattern close to the ground. If they have already sprouted, you will need a post-emergent herbicide containing Quinclorac.

Be careful, though! Some Zoysia varieties are sensitive to high doses of Quinclorac. Always test a small, inconspicuous patch of your lawn before spraying the entire yard to ensure no discoloration occurs.

Chemical Solutions: Selective vs. Non-Selective

When you walk down the aisle at the garden center, the choices can be overwhelming. The most important distinction to understand is between selective and non-selective herbicides.

Selective herbicides are designed to kill specific plants while leaving others alone. These are your best friends. They allow for killing weeds in zoysia grass while the grass continues to grow happily around the dying weed.

Non-selective herbicides, like those containing Glyphosate, kill everything they touch. These should only be used for “spot treating” or if you are starting a lawn from scratch. Never spray these over your whole Zoysia lawn unless you want a dirt lot!

Using Surfactants for Better Results

Have you ever noticed how water beads up on a leaf? Weeds have a waxy coating that protects them. A surfactant is a “sticker” that you mix with your herbicide to help it cling to the weed leaf.

Using a surfactant ensures the chemical actually penetrates the weed rather than just rolling off onto the soil. A simple DIY trick is adding a teaspoon of clear dish soap to your sprayer, though professional-grade non-ionic surfactants work much better.

Spot Treating vs. Broadcast Spraying

If your lawn is 90% healthy and you only have a few dandelions, don’t spray the whole yard. Spot treating with a small hand sprayer is better for the environment and better for your grass’s health.

Broadcast spraying (covering the whole lawn) should be reserved for cases where the weed infestation is widespread. This is most common in new lawns or lawns that have been neglected for a few seasons.

Natural and Cultural Methods for Weed Control

You don’t always need a bottle of chemicals to have a beautiful lawn. In fact, the healthiest lawns in the world rely on “cultural controls”—which is just a fancy way of saying good gardening habits.

The goal is to make your Zoysia so thick and healthy that weeds simply don’t have the space or sunlight to grow. A dense canopy is the ultimate natural defense against invaders.

Think of your lawn as a living shield. Every time you mow correctly or water deeply, you are strengthening that shield and making it harder for a weed seed to reach the soil and germinate.

The Importance of Mowing Height

Many homeowners make the mistake of “scalping” their lawn, thinking it will mean they have to mow less often. This is a huge mistake for Zoysia. If you cut it too short, you expose the soil to sunlight, which triggers weed seeds to wake up.

Keep your Zoysia between 1.5 and 2.5 inches tall. This height provides enough shade to keep the soil cool and dark, which naturally prevents most crabgrass from ever starting.

Deep and Infrequent Watering

Weeds often have shallow root systems. If you water your lawn for 5 minutes every day, you are keeping the surface wet and feeding the weeds. Instead, water deeply (about 1 inch) once or twice a week.

This encourages your Zoysia roots to grow deep into the earth to find moisture. Meanwhile, the surface of the soil dries out, making it a hostile environment for new weed seedlings trying to take root.

Manual Removal: The Right Way

Hand-pulling is still one of the most effective ways of killing weeds in zoysia grass if you only have a few. However, you must get the entire root. Use a “fishtail” weeder or a long-handled dandelion puller to reach deep.

Always pull weeds when the soil is moist, such as after a rain or a watering session. The soil will be loose, and the roots will slide out much easier without snapping off and regrowing later.

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Common Pitfalls to Avoid

Even experienced gardeners make mistakes. One of the biggest errors is applying fertilizer and weed killer at the same time during a drought. If the grass is stressed from lack of water, the chemicals can be “sucked in” too fast, causing fertilizer burn.

Another mistake is mowing immediately after spraying. You want the herbicide to sit on the weed leaves for at least 24 to 48 hours so the plant can absorb it. If you mow it off, you are just cutting away the medicine the weed needs to die!

Lastly, never use “weed and feed” products that are formulated for Northern grasses like Bluegrass or Fescue. Zoysia is a Southern grass and has different sensitivities. Always look for “Safe for Zoysia” on the front of the bag.

Safety First: Protecting Yourself and Your Pets

When working with any lawn chemicals, safety should be your top priority. Always wear long pants, closed-toe shoes, and gloves. It might feel hot outside, but protecting your skin from concentrated chemicals is vital.

Keep children and pets off the lawn until the liquid spray has completely dried. Once dry, the herbicide is generally “locked” onto the plant and is safe for normal foot traffic. Most products suggest waiting 2-4 hours just to be safe.

If you are ever unsure about a product or if you have a massive infestation that seems out of control, don’t hesitate to call a local lawn care professional. Sometimes a one-time professional “reset” is all you need to get back on track.

Frequently Asked Questions About killing weeds in zoysia grass

Can I use vinegar to kill weeds in my Zoysia lawn?

While vinegar is a natural acid that kills plant leaves, it is non-selective. This means it will kill your Zoysia grass just as quickly as it kills the weeds. Only use vinegar on driveways or mulch beds where you want everything to die.

How long does it take for weeds to die after spraying?

Most broadleaf weeds will begin to curl and turn yellow within 3 to 5 days. However, it can take up to two weeks for the weed to completely turn brown and disappear. Resist the urge to spray again too soon; give the chemical time to work its way to the roots.

Is it safe to spray weeds when the Zoysia is dormant?

Yes, this is actually a great time for killing weeds in zoysia grass. Since the grass is dormant, it is less likely to absorb the herbicide. You can often use stronger products to target winter weeds like Poa Annua without risking the health of your turf.

Why do weeds keep coming back in the same spot?

This usually happens because the underlying soil is compacted or there is a “void” in the grass. Weeds are nature’s way of covering bare earth. Try aerating that spot and adding a little Zoysia-specific fertilizer to help the grass fill in the gap.

Final Thoughts for a Weed-Free Oasis

Managing a Zoysia lawn is a journey, not a one-time event. By combining the right timing, the correct products, and smart mowing habits, you can create a lawn that is the envy of the neighborhood. Remember to be patient; Zoysia takes its time to grow, but the results are worth the wait.

Start by identifying your biggest weed problem today and choosing one of the methods we discussed. Whether it is a quick spot treatment or adjusting your mower blade, every small step leads to a thicker, healthier lawn. You’ve got this—now go out there and reclaim your beautiful green space!

Rimon Chowdhury
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