How to Get Rid of Bahia Grass in a Bermuda Lawn

If you maintain a Bermuda grass lawn, you already know the frustration. You spend your Saturday afternoon mowing, edging, and blowing the hardscapes until the yard looks like a pristine golf course. Then, just three days later, ugly, tall, Y-shaped seed heads shoot up across the lawn, ruining the perfectly even look.

I have fought this exact battle in multiple USDA zones across the South. Bahia grass is an incredibly resilient, coarse-textured weed that thrives in the same warm, sunny conditions as Bermuda grass. Because both are warm-season turfgrasses, controlling one without harming the other requires a very specific approach. You cannot simply spray a generic weed killer and hope for the best.

Over my 15 years of lawn care and turf management, I have tested nearly every herbicide, digging tool, and cultural practice available. I have made the mistakes so you do not have to. In this guide, I will walk you through the exact steps, products, and maintenance routines required to completely eradicate Bahia grass from your Bermuda lawn.

Quick Answer

To get rid of bahia grass in a bermuda lawn, apply a selective post-emergent herbicide containing metsulfuron-methyl (like MSM Turf) or a blend containing thiencarbazone-methyl (like Celsius WG). These specific active ingredients kill the deep rhizomes of the bahia grass without damaging your bermuda grass. Always mix the herbicide with a non-ionic surfactant to help it adhere to the weed’s waxy leaves. For the highest success rate, spray when the bahia grass is actively growing and soil temperatures are above 70°F.

Why This Problem Happens

Bahia grass (Paspalum notatum) was originally introduced as a pasture grass because it survives terrible soil, severe drought, and heavy foot traffic. It develops a massive, thick root system made of woody rhizomes that store energy deep underground.

When Bahia grass invades a Bermuda lawn, it usually happens because the lawn was stressed, under-fertilized, or cut too high. Birds and wind frequently carry Bahia seeds into residential neighborhoods. Once a single seed germinates, the plant quickly establishes its rhizome network. If you try to pull it by hand, the rhizome snaps, leaving a piece behind that simply grows into a new plant a few weeks later.

Because Bermuda grass goes dormant in the winter and takes time to green up in the spring, Bahia often uses this window to steal sunlight and nutrients. By the time your Bermuda is ready to spread, the Bahia has already established a stronghold.

Symptoms to Look For

Before you start spraying chemicals, you must confirm that you are actually dealing with Bahia grass. Many homeowners mistake it for Dallisgrass or Crabgrass, which require completely different chemical treatments.

Look closely at the weed’s growth habit. Bahia grass has light green, coarse blades that grow much faster than Bermuda. However, its most defining characteristic is the seed head. Bahia grass produces a tall stem topped with a distinct “Y” or “V” shape, usually featuring two branches covered in tiny black seeds.

To help you positively identify the weed in your yard, here is a breakdown of the differences between your desirable turf and the invading weed.

Identification Factors

Understanding these differences is crucial for targeting the weed. If your weed has three to five alternating spikes on the seed head, you might be dealing with Dallisgrass instead, which requires a different eradication method.

🌱 Beginner Note: If you are unsure what weed you have, let one patch grow for a week without mowing. The seed head is the absolute easiest way to identify a grass-type weed.

Most Common Causes

Understanding how Bahia grass entered your lawn dictates how you will prevent it from coming back. It rarely invades a thick, perfectly healthy Bermuda lawn. It looks for weak spots.

I have evaluated dozens of neglected lawns, and the invasion almost always traces back to a few specific lawn care failures. Here are the primary reasons this weed takes over.

Invasion Triggers

Addressing these underlying causes is just as important as spraying the existing weeds. If you only kill the current crop of Bahia without fixing your soil or mowing habits, a new batch of seeds will germinate next season.

Step-by-Step Solutions

Eradicating Bahia grass requires a targeted approach. You have a few options depending on the severity of the infestation. I will break down the most effective methods, starting with the one I rely on most often for complete control.

Method 1: Selective Herbicides (The Best Approach)

Chemical control is the only realistic way to deal with a widespread Bahia grass problem. Because both plants are warm-season grasses, you need a highly selective herbicide.

In the past, professionals used MSMA, but its residential use has been heavily restricted or banned in many areas. Today, the most effective active ingredient is metsulfuron-methyl. Products like MSM Turf or Manor contain this ingredient. Another excellent, though more expensive, option is Celsius WG.

Here are the top chemical options I keep in my turf management arsenal.

Herbicide Comparison

Choosing the right herbicide is only half the battle; applying it correctly is where most homeowners fail. MSM Turf is incredibly potent. A tiny bottle will last a homeowner a lifetime because the application rate is measured in fractions of an ounce per acre.

How to Mix and Apply

1. Wait for Active Growth: Do not spray during a drought or when the lawn is dormant. The Bahia grass must be actively growing to absorb the chemical. Wait at least three days after your last mow.

2. Measure Precisely: Use a micro-scale. For a 1-gallon pump sprayer (which covers about 1,000 square feet), you typically need less than 0.1 grams of MSM Turf. Follow the label exactly.

3. Add a Surfactant: This is non-negotiable. Bahia grass leaves are waxy. Add 2 teaspoons of a non-ionic surfactant to your gallon of water. This breaks the surface tension and allows the herbicide to stick to the leaf.

4. Spot Spray: Spray the Bahia grass leaves until they are wet, but not to the point of runoff. Do not drench the soil.

5. Wait Patiently: Metsulfuron-methyl works slowly. The weed will stop growing within days, but it may take three to four weeks to completely turn brown and die.

💡 Pro Tip: Never apply Metsulfuron-methyl over the root zones of desirable ornamental trees or shrubs. It is highly active in the soil and can severely damage nearby oak trees or ornamental plants.

Method 2: The “Glove of Death” (For Minor Invasions)

If you only have a few rogue Bahia plants popping up and you do not want to mix up selective herbicides, you can use non-selective glyphosate (Roundup). However, you cannot spray it, or you will kill your Bermuda grass.

Because Bahia grass shoots up several inches taller than Bermuda grass just a few days after mowing, you can use height to your advantage.

Put on a thick, chemical-resistant rubber glove. Put a cheap cotton glove over the rubber glove. Dip the fingers of the cotton glove into a mixed glyphosate solution. Walk your lawn and gently wipe the tall Bahia grass blades and seed heads. The poison will transfer only to the weed, travel down to the rhizome, and kill it, leaving the shorter Bermuda grass completely untouched.

Method 3: Mechanical Removal

I generally advise against digging up Bahia grass. The rhizomes are thick, woody, and run deep. If you use a shovel or a weed puller, you will inevitably leave a small piece of the root behind.

If you choose to dig, you must dig a hole significantly larger and deeper than the weed appears to require. You will pull up a large plug of soil. You must then backfill the hole with topsoil or sand to allow the surrounding Bermuda grass to fill in the bare spot.

When Each Fix Works Best

Timing your attack is critical. Herbicides rely on the plant’s internal transport system to carry the poison down to the roots. If you spray at the wrong time, you will only burn the leaves, and the plant will recover.

Here is a timeline to help you plan your eradication strategy.

Application Timeline

Following this timeline prevents you from over-applying chemicals out of frustration. Give the product time to work through the weed’s tough vascular system.

Prevention Tips

Once you clear the Bahia grass out of your yard, your primary goal is keeping it out. Bermuda grass is an aggressive spreader. If you encourage your Bermuda to thrive, it will naturally choke out most weed seeds before they can establish.

Cultural practices are your best defense. I have transformed thin, weed-infested yards into thick carpets just by changing how the homeowner mows and waters.

Here are the specific lawn care habits that discourage Bahia grass from returning.

Cultural Control Methods

Focusing on these cultural habits ensures that even if a bird drops a seed in your yard, the resulting plant will struggle to compete for sunlight and root space.

⚠️ Warning: Do not rely solely on pre-emergent herbicides to stop Bahia grass. While pre-emergents stop seeds from germinating, they do absolutely nothing to stop an existing Bahia rhizome from pushing up new growth in the spring.

My Experience With This Problem

Several years ago, I took over the maintenance of a half-acre Bermuda lawn in Zone 8 that was overrun with Bahia grass. The previous owner had been mowing it at nearly three inches high, which is fine for Fescue but terrible for Bermuda. The Bahia had taken over nearly 40% of the turf canopy.

My first instinct was to nuke the yard and start over. Instead, I decided to test the limits of MSM Turf. In late May, when the temperatures were hovering around 85°F, I blanket-sprayed the yard using a backpack sprayer with a fan tip nozzle, ensuring I used a high-quality non-ionic surfactant.

For the first week, I thought I had failed. The Bahia was still green. But by week two, the Bahia took on a sickly yellow hue, and the fast-growing seed heads completely stopped popping up. By week four, the Bahia was entirely brown and brittle.

The most crucial step happened next. I dropped the mower deck to one inch and fertilized the Bermuda grass heavily with quick-release nitrogen. The Bermuda grass rushed into the bare spots left by the dead Bahia. Within six weeks, the lawn looked like a different property. The key takeaway from my experience is patience—do not re-apply herbicides just because the weed isn’t dead on day three.

Maintenance Schedule to Prevent Recurrence

Weed control is not a one-time event; it is a year-round maintenance routine. By staying ahead of the growing season, you can stop weeds before they become an eyesore.

I use a strict seasonal schedule to keep Bermuda grass dominant and weed-free.

Annual Prevention Schedule

Sticking to this schedule guarantees that your lawn remains thick enough to physically block sunlight from reaching any weed seeds lying dormant in the soil.

🔧 Quick Fix: If you are hosting a backyard event and have tall Bahia seed heads ruining the look of your lawn, mow the yard the morning of the event. The seed heads take two to three days to shoot back up, giving you a temporary clean look for your guests.

When to Call a Professional

While DIY weed control is entirely possible, there are times when bringing in a professional applicator makes sense.

If your yard is more than 50% Bahia grass, calculating the exact amount of Metsulfuron-methyl for a broadcast spray can be risky for a beginner. An overdose will severely stunt or kill your Bermuda grass. Professionals have calibrated spray rigs that apply the exact decimal amount of chemical required per thousand square feet.

Additionally, if you live in a state with strict herbicide regulations, you may not be able to legally purchase the most effective commercial-grade chemicals. In these cases, paying a local turf company for a specialized post-emergent spray is often cheaper than buying ineffective big-box store weed killers that only burn the tops off the plants.

FAQs

Will MSMA kill Bahia grass?

Yes, MSMA is highly effective against Bahia grass. However, the EPA has strictly limited the use of MSMA due to arsenic concerns. It is largely illegal for residential lawn application. Metsulfuron-methyl is the modern, safer alternative for homeowners.

Does mowing low kill Bahia grass?

No, mowing low will not kill an established Bahia plant due to its deep root system. However, frequent low mowing removes the seed heads (preventing further spread) and helps Bermuda grass grow thicker, which eventually helps choke out the weed over time.

Can I use Weed and Feed to get rid of Bahia grass?

Most granular “Weed and Feed” products found at hardware stores are ineffective against mature Bahia grass. The active ingredients are usually 2,4-D and Dicamba, which are great for broadleaf weeds like dandelions but terrible for grassy weeds like Bahia. You need a liquid spray for proper leaf absorption.

Why did the weed come back after I sprayed it?

If the weed returned, you likely burned the foliage without killing the rhizome. This usually happens if you spray during a drought, apply without a surfactant, or use a weed killer not rated for Bahia grass.

Is Bahia grass ever desirable?

Yes, in rural areas, pastures, or alongside highways. It is fantastic for erosion control and can survive without irrigation. But in a highly manicured residential Bermuda lawn, it is treated strictly as an invasive weed.

Final Thoughts

Learning how to get rid of bahia grass in bermuda lawn comes down to using the right chemical and applying it with patience. Ditch the generic hardware store weed killers and invest in a quality selective herbicide like MSM Turf or Celsius WG. Always use a surfactant, measure your chemicals carefully, and allow the product a full three to four weeks to destroy the underground rhizomes. Once the weed is gone, focus on mowing low and fertilizing properly. A thick, well-fed Bermuda lawn is the ultimate weed barrier.