Bermuda Grass Pre-Emergent: When to Apply, Best Products, and Complete Weed Prevention Guide

Keeping a Bermuda grass lawn thick, green, and weed-free requires more than regular mowing and watering. One of the most important parts of a successful Bermuda grass lawn care program is applying pre-emergent herbicide at the right time.

Pre-emergent herbicides help prevent many common lawn weeds from growing by stopping weed seeds from successfully developing. When applied correctly, they can significantly reduce problems with crabgrass, goosegrass, annual bluegrass (Poa annua), and other troublesome weeds.

But when should you apply pre-emergent to Bermuda grass? Which products work best? And how often should you apply them?

The short answer: Most established Bermuda grass lawns benefit from a spring pre-emergent application to prevent summer weeds. A second application in late summer or early fall may be beneficial for lawns with a history of winter weeds.

For spring crabgrass prevention, a useful timing guideline is to apply pre-emergent before soil temperatures at a depth of 4 inches reach approximately 55°F for several consecutive days.

Timing is critical. Applying pre-emergent too early or too late can reduce its effectiveness.

In this guide, we’ll explain when to apply pre-emergent to Bermuda grass, which products to consider, how much to use, and how to build an effective year-round weed prevention program.

When to Apply Pre-Emergent to Bermuda Grass

The best time to apply pre-emergent to Bermuda grass depends on your climate, soil temperatures, and the types of weeds you want to prevent.

For most homeowners, the ideal schedule includes a spring application and, when needed, a fall application.

• Spring application: Late winter to early spring, before crabgrass and other summer annual weeds germinate.
• Fall application: Late summer to early fall, before winter annual weeds begin growing.

Soil temperature is generally a more reliable indicator than the calendar.

Spring Pre-Emergent Application

Spring is the most important time to apply pre-emergent to Bermuda grass.

Many common summer weeds begin germinating as soil temperatures warm up. Crabgrass, goosegrass, and other annual weeds can quickly spread throughout a lawn if preventative treatments are not applied in time.

For crabgrass prevention, a useful general guideline is to apply pre-emergent before soil temperatures at a 4-inch depth reach approximately 55°F for five consecutive days.

This usually occurs in late February, March, or early April, depending on your location.

Homeowners in warmer climates may need to apply earlier, while those in cooler regions may need to wait longer.

Spring application goals:

• Prevent crabgrass.
• Reduce goosegrass.
• Prevent other susceptible summer annual weeds.
• Reduce the need for post-emergent herbicide applications later in the season.

Fall Pre-Emergent Application

A second pre-emergent application in late summer or early fall can help prevent winter annual weeds.

Common winter weeds include:

• Annual bluegrass (Poa annua).
• Chickweed.
• Henbit.
• Annual ryegrass.

For many lawns, the fall application should be made before soil temperatures drop into the germination range for winter annual weeds.

A useful general timing indicator for winter annual weed prevention is approximately 70°F soil temperature at a 4-inch depth, although individual weed species have different germination requirements.

Depending on your climate, this may mean applying pre-emergent in September or October.

A properly timed fall application can help your Bermuda grass lawn remain cleaner throughout winter and make spring lawn care easier.

Important: If you plan to overseed Bermuda grass with perennial ryegrass for winter color, be careful when applying fall pre-emergent. Many pre-emergent herbicides will also interfere with the germination and establishment of desirable grass seed.

Bermuda Grass Pre-Emergent Application Schedule

The following schedule provides a general guide for established Bermuda grass lawns.

Your exact schedule will depend on your location and local soil temperatures. Always follow the herbicide label for application intervals and annual maximum rates.

What Is the Best Pre-Emergent for Bermuda Grass?

Several active ingredients are commonly used for pre-emergent weed control in established Bermuda grass lawns.

The best option depends on the weeds you want to prevent, your application schedule, and whether your lawn is established or newly planted.

Here are some of the most common options.

1. Prodiamine

Prodiamine is one of the most popular pre-emergent herbicide ingredients used in residential Bermuda grass lawn care.

It provides long-lasting prevention of many annual grassy weeds and certain broadleaf weeds.

Prodiamine is commonly used to prevent:

• Crabgrass.
• Goosegrass.
• Annual bluegrass.
• Certain other annual grassy weeds.

One of its biggest advantages is its relatively long residual activity when applied at an appropriate labeled rate.

This makes it useful for homeowners who want to prevent weeds throughout the growing season.

Advantages of prodiamine:

• Long-lasting weed prevention.
• Effective against many annual grassy weeds.
• Available in granular and sprayable formulations.
• Commonly used in established Bermuda grass lawns.

Potential disadvantages:

• Must be applied before targeted weeds germinate.
• Can interfere with grass seed germination.
• Requires careful attention to application rates.
• Not appropriate for every newly seeded or recovering lawn.

Prodiamine is often sold under the Barricade brand name, along with various generic products.

2. Dithiopyr

Dithiopyr is another popular pre-emergent herbicide used on Bermuda grass.

One advantage of dithiopyr is that certain formulations can provide early post-emergent control of crabgrass during a limited growth stage.

This gives homeowners a little more flexibility compared with some traditional pre-emergent products.

Dithiopyr is commonly used to prevent:

• Crabgrass.
• Certain annual grassy weeds.
• Some susceptible broadleaf weeds.

Advantages of dithiopyr:

• Prevents crabgrass before germination.
• Can control very young crabgrass under appropriate label conditions.
• Available in granular and liquid formulations.
• Useful for established Bermuda grass lawns.

Potential disadvantages:

• Timing still matters.
• Not effective against every lawn weed.
• Can interfere with grass seed establishment.
• Application rates vary by formulation.

Dimension is a well-known brand associated with dithiopyr.

3. Pendimethalin

Pendimethalin is another widely used pre-emergent herbicide.

It is commonly found in homeowner lawn-care products designed to prevent crabgrass and other annual weeds.

Pendimethalin can help prevent:

• Crabgrass.
• Certain annual grassy weeds.
• Some susceptible broadleaf weeds.

Advantages of pendimethalin:

• Widely available to homeowners.
• Effective against several common annual weeds.
• Available in granular formulations.
• Useful for spring and fall weed prevention when appropriately labeled.

Potential disadvantages:

• Must be applied before targeted weeds germinate.
• Requires watering-in according to the product label.
• Can interfere with desired grass seed germination.
• Some granular formulations may stain concrete or other hard surfaces.

Scotts Halts and Pendulum are examples of products associated with pendimethalin.

Pre-Emergent Comparison Chart

Always verify the specific product label to confirm that it is approved for Bermuda grass and the weeds you want to control.

How to Apply Pre-Emergent to Bermuda Grass

Applying pre-emergent correctly is just as important as choosing the right product.

Even an excellent herbicide may provide disappointing results if it is applied at the wrong rate or not watered in when required.

Follow these steps for better results.

Step 1: Measure Your Lawn

Before applying pre-emergent, determine the square footage of your lawn.

This helps ensure that you apply the correct amount of herbicide.

For example:

• Small lawn: 2,000 square feet.
• Medium lawn: 5,000 square feet.
• Large lawn: 10,000 square feet.
• Extra-large lawn: 20,000 square feet.

If you are unsure of your lawn’s size, use our Bermuda grass lawn calculators to estimate the area.

Accurate measurements help prevent overapplication and save money on lawn-care products.

Step 2: Choose the Right Product

Select a pre-emergent based on the weeds you want to prevent.

For example:

• Prodiamine is a popular choice for long-lasting crabgrass prevention.
• Dithiopyr is useful when early crabgrass activity is a concern.
• Pendimethalin is a widely available option for homeowners.

Check the label to make sure the product is approved for established Bermuda grass.

Step 3: Check the Application Rate

Every pre-emergent product has specific application instructions.

The correct rate depends on the active ingredient, product formulation, target weeds, and desired length of control.

Never assume that two products with the same active ingredient have identical application rates.

Read the label carefully and measure the correct amount for your lawn’s square footage.

Applying too much herbicide can injure desirable turf, while applying too little may result in inadequate weed prevention.

Step 4: Apply the Pre-Emergent Evenly

Pre-emergent herbicides are available in both granular and liquid formulations.

Granular pre-emergent:

A broadcast spreader is commonly used to distribute granular products.

Walk at a consistent speed and follow the spreader settings recommended by the manufacturer.

Avoid applying excessive product in overlapping areas.

Liquid pre-emergent:

Liquid formulations are generally applied using a pump sprayer or backpack sprayer.

Make sure you calibrate your sprayer so that the correct amount of product is distributed over the intended lawn area.

Step 5: Water It In When Required

Many pre-emergent products need to be watered into the soil to activate properly.

This helps move the herbicide into the upper soil layer where weed seeds germinate.

Some product labels specify approximately 0.5 inch of irrigation, but the correct amount depends on the specific product.

Always follow the manufacturer’s watering instructions.

Do not assume that rainfall or irrigation requirements are identical for every pre-emergent.

Step 6: Avoid Disturbing the Soil

Pre-emergent herbicides create a treated zone near the soil surface.

Excessive soil disturbance can reduce weed prevention by breaking up this treated layer.

After applying pre-emergent, avoid unnecessary:

• Aeration.
• Dethatching.
• Digging.
• Soil cultivation.
• Raking that significantly disturbs the soil.

If you plan to aerate or perform major lawn renovations, consider scheduling those activities before applying pre-emergent.

How Often Should You Apply Pre-Emergent to Bermuda Grass?

Most established Bermuda grass lawns benefit from a spring application.

A second application may be necessary if you want to maintain weed prevention throughout the summer or prevent winter annual weeds.

However, the correct frequency depends on the product’s residual activity and label restrictions.

One Application Per Year

A single spring application may provide sufficient crabgrass prevention for some lawns.

This can be appropriate when:

• Weed pressure is relatively low.
• The product provides adequate residual control.
• The growing season is relatively short.
• There is little history of winter annual weeds.

Two Applications Per Year

Two applications are common for homeowners who experience both summer and winter weed problems.

A typical approach is:

1. Apply pre-emergent in late winter or early spring to prevent summer weeds.
2. Apply another treatment in late summer or early fall to prevent winter annual weeds.

The second application should be selected and timed based on the weeds you want to prevent.

Split Applications

Some homeowners divide their annual pre-emergent treatment into multiple smaller applications.

This approach can help maintain more consistent weed prevention during extended growing seasons.

For example, a homeowner might apply one portion of the planned seasonal treatment in early spring and another portion several weeks later.

However, split applications must stay within the product’s maximum annual application rate and minimum interval requirements.

Always follow the product label.

Common Weeds Prevented by Bermuda Grass Pre-Emergent

Pre-emergent herbicides are particularly useful for preventing annual weeds that reproduce through seeds.

Here are some of the most common weeds that can be managed through preventative treatments.

Crabgrass

Crabgrass is one of the biggest problems for Bermuda grass lawns.

It is a warm-season annual weed that germinates in spring and spreads rapidly during summer.

Crabgrass can create large patches in thin or poorly maintained Bermuda grass lawns.

A properly timed spring pre-emergent application can significantly reduce crabgrass problems.

Goosegrass

Goosegrass is another troublesome summer annual weed.

It commonly appears in compacted areas, along sidewalks, and in sections of the lawn that experience heavy traffic.

Goosegrass often forms flat, dense clumps that can be difficult to remove once established.

Pre-emergent applications can help prevent goosegrass when applied at the appropriate time and rate.

Annual Bluegrass (Poa Annua)

Annual bluegrass is a common winter annual weed.

It can appear in Bermuda grass lawns during cooler months when the Bermuda grass is dormant.

Annual bluegrass often produces light green patches and distinctive seed heads.

A properly timed fall pre-emergent application can help reduce annual bluegrass germination.

Chickweed

Chickweed is a cool-season broadleaf weed that commonly appears during fall and winter.

It thrives in moist conditions and can spread quickly in thin areas of the lawn.

Certain pre-emergent products can help prevent chickweed, depending on the active ingredient and product label.

Henbit

Henbit is another common winter annual broadleaf weed.

It often produces purple flowers and spreads throughout lawns during cooler months.

Fall pre-emergent applications can help reduce henbit problems.

Can You Apply Pre-Emergent to Newly Seeded Bermuda Grass?

This is one of the most important considerations when planning your Bermuda grass lawn care schedule.

Most traditional pre-emergent herbicides should not be applied immediately before or after seeding Bermuda grass.

Why?

Pre-emergent herbicides work by interfering with the development of newly germinating plants. Unfortunately, this means they can also prevent desirable Bermuda grass seeds from developing.

If you are planning to seed a new Bermuda grass lawn, applying pre-emergent at the wrong time can result in poor germination or complete establishment failure.

What About Newly Sodded or Sprigged Bermuda Grass?

Newly established Bermuda grass may also be sensitive to certain pre-emergent herbicides.

Some products have specific label allowances for newly sprigged or plugged Bermuda grass, but these exceptions are product-specific.

Do not assume that a product approved for established Bermuda grass is automatically safe for newly planted turf.

If you recently seeded, sodded, or sprigged your lawn, check the product label before applying any pre-emergent.

Can You Apply Pre-Emergent and Fertilizer at the Same Time?

Yes, some pre-emergent products are combined with fertilizer, allowing homeowners to apply both treatments in a single application.

However, this does not mean every pre-emergent should be applied with nitrogen fertilizer.

Bermuda grass should generally receive nitrogen when it is actively growing and has sufficiently greened up.

Applying nitrogen to dormant Bermuda grass is usually unnecessary and can encourage undesirable cool-season weed growth.

If you use a combination pre-emergent and fertilizer product, pay attention to the fertilizer analysis and make sure the timing is appropriate for your Bermuda grass lawn.

A fertilizer-free pre-emergent formulation can be a better option when you want weed prevention before Bermuda grass begins actively growing.

Common Mistakes When Applying Pre-Emergent to Bermuda Grass

Even experienced homeowners can make mistakes when applying pre-emergent.

Avoid these common problems to improve your results.

Applying Too Late

One of the most common mistakes is waiting until crabgrass is already growing.

Pre-emergent herbicides are designed primarily to prevent weeds before they emerge.

Once crabgrass has established itself, you may need a post-emergent herbicide instead.

Applying Too Early

Applying pre-emergent too early can leave insufficient residual activity when weed seeds eventually begin germinating.

Monitor soil temperatures and follow the manufacturer’s recommended application window.

Using Too Much Product

Applying more herbicide than recommended does not necessarily provide better weed control.

Excessive application can increase the risk of turf injury and violate label restrictions.

Always measure your lawn and follow the application rate.

Forgetting to Water It In

Some pre-emergent products require irrigation after application.

If the product is not watered in as directed, its effectiveness may be reduced.

Check the label for specific watering requirements.

Applying Before Aeration

Aeration creates holes throughout the lawn and disturbs the soil.

If you apply pre-emergent before aerating, the process may disrupt the treated soil layer.

Whenever possible, schedule aeration before your pre-emergent application.

Applying Before Overseeding

Pre-emergent herbicides can prevent Bermuda grass seeds from germinating.

If you plan to overseed bare areas or establish a new lawn, make sure you understand the herbicide’s seeding restrictions.

How to Maintain a Weed-Free Bermuda Grass Lawn

Pre-emergent is an important part of lawn care, but it should not be your only weed prevention strategy.

The best long-term approach is to maintain a thick, healthy Bermuda grass lawn that naturally competes with weeds.

Here are several ways to improve your results.

Mow at the Correct Height

Bermuda grass should generally be maintained at a height appropriate for its variety and mowing equipment.

Common hybrid Bermuda varieties are often maintained shorter than common Bermuda grass.

Regular mowing helps keep the lawn dense and reduces opportunities for weeds to establish.

Water Properly

Deep, infrequent watering encourages stronger root development.

Avoid constantly watering the lawn with small amounts of water.

Your exact irrigation schedule will depend on soil type, weather, and lawn conditions.

Apply Fertilizer at the Right Time

Bermuda grass benefits from nitrogen during active growth.

Apply fertilizer based on your lawn’s needs and local soil test recommendations.

Avoid excessive nitrogen applications, which can encourage rapid growth and increase maintenance requirements.

Improve Soil Conditions

Compacted soil can contribute to thin Bermuda grass and increased weed pressure.

Aeration can improve soil conditions and encourage healthy root development.

Perform aeration when Bermuda grass is actively growing and schedule it before applying pre-emergent.

Repair Thin Areas

Bare spots provide an opportunity for weeds to establish.

Repair damaged areas by seeding, plugging, or sodding when conditions are appropriate.

Remember that traditional pre-emergent herbicides can interfere with new Bermuda grass establishment.

Frequently Asked Questions About Bermuda Grass Pre-Emergent

What Is the Best Pre-Emergent for Bermuda Grass?

Prodiamine, dithiopyr, and pendimethalin are three popular pre-emergent active ingredients used in established Bermuda grass lawns.

Prodiamine is popular for its relatively long residual control, dithiopyr offers some early post-emergent crabgrass activity, and pendimethalin is widely available in homeowner products.

The best choice depends on your target weeds, application timing, and product label.

When Should I Apply Pre-Emergent to Bermuda Grass in the Spring?

Apply spring pre-emergent before soil temperatures at a 4-inch depth reach approximately 55°F for five consecutive days.

Depending on your location, this may occur between February and April.

Use soil temperatures rather than relying entirely on the calendar.

Can I Apply Pre-Emergent to Bermuda Grass in the Summer?

Yes, certain pre-emergent products can be applied during summer.

A summer application may be appropriate when you need additional residual weed prevention.

However, follow the product’s minimum application intervals and maximum annual rates.

Should I Apply Pre-Emergent to Bermuda Grass in the Fall?

Yes, a fall application can help prevent winter annual weeds such as annual bluegrass, chickweed, and henbit.

Apply before the targeted weeds germinate and make sure the product is appropriate for your lawn.

Does Pre-Emergent Kill Existing Weeds?

No. Most traditional pre-emergent herbicides prevent new weeds from developing rather than killing weeds that are already established.

If you already have crabgrass, chickweed, or other weeds growing in your lawn, you may need an appropriate post-emergent treatment.

Can I Apply Pre-Emergent and Fertilizer Together?

Yes, combination products are available.

However, make sure the fertilizer portion is appropriate for your lawn’s current growth stage.

Avoid applying unnecessary nitrogen to dormant Bermuda grass.

How Long Does Pre-Emergent Last?

The length of weed prevention depends on the active ingredient, application rate, soil conditions, and weather.

Some products provide several weeks of control, while others can provide protection for several months.

Always follow the manufacturer’s recommended application intervals.

Can I Mow After Applying Pre-Emergent?

In most cases, mowing can continue according to the product label.

However, avoid disturbing the soil or treated area.

For granular products, follow any instructions regarding mowing before or after application.

Will Pre-Emergent Hurt My Bermuda Grass?

When used according to the label on appropriate, established Bermuda grass, many pre-emergent products can provide effective weed prevention without unacceptable turf injury.

However, newly seeded, sprigged, sodded, stressed, or recovering Bermuda grass may be more vulnerable.

Always check the label for restrictions.

Final Thoughts: The Best Pre-Emergent Strategy for Bermuda Grass

Applying pre-emergent at the right time is one of the most effective ways to maintain a thick, healthy, weed-free Bermuda grass lawn.

For most homeowners, a spring application is essential for preventing summer weeds such as crabgrass and goosegrass. A second application in late summer or early fall can help prevent winter weeds such as annual bluegrass, chickweed, and henbit.

Remember these important tips:

1. Apply spring pre-emergent before soil temperatures reach approximately 55°F at a 4-inch depth for several consecutive days.
2. Consider a fall application to prevent winter annual weeds.
3. Choose a product with an active ingredient that targets your specific weeds.
4. Measure your lawn to ensure accurate application rates.
5. Water in the product when required by the label.
6. Avoid applying traditional pre-emergent before seeding or overseeding Bermuda grass.
7. Maintain a thick, healthy lawn through proper mowing, watering, and fertilization.

A good pre-emergent program can dramatically reduce the time and money spent fighting weeds throughout the year.

By applying the right product at the right time, you can give your Bermuda grass lawn a much better chance of staying thick, green, and healthy throughout the growing season.

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