Seeing your bermuda grass brown can be a worrying sight. Bermuda grass turning brown can signal various issues, from seasonal dormancy to underlying cultural problems. This guide will help you figure out why it’s happening and, more importantly, what you can do about it.
We’ll walk through the common causes, from simple fixes to more serious concerns. You’ll learn how to diagnose the problem and take clear, effective action to restore your lawn’s health and color.
Bermuda Grass Brown
When your bermuda grass turns brown, it’s essentially sending a distress signal. The first step is accurate diagnosis. Jumping to conclusions can lead to wasted time and money on the wrong treatments. Let’s break down the primary reasons, starting with the most natural one.
Seasonal Dormancy Is Normal
Bermuda grass is a warm-season grass. This means it thrives in the heat of summer and goes dormant, turning brown, when temperatures drop in the fall and winter. This is a natural survival mechanism, not a sign of disease or death.
- What to Look For: A uniform brown color across the entire lawn after the first hard frost. The grass will feel dry and brittle underfoot.
- When It Happens: Typically in late fall and throughout winter, depending on your climate zone.
- What to Do: This requires no corrective action. The grass will green up on its own as soil temperatures consistently reach about 65°F in the spring. Avoid heavy traffic on dormant grass to prevent crown damage.
Improper Watering Practices
Watering is a balancing act. Both too much and too little water will cause bermuda grass to turn brown, but the symptoms and solutions differ.
Underwatering and Drought Stress
Bermuda grass is drought-tolerant, but it has limits. Prolonged dry spells, especially in peak summer heat, will cause it to go dormant early or become severely stressed.
- Symptoms: Grass takes on a grayish or bluish tint before browning. Footprints or mower tracks remain visible long after you walk or mow (loss of elasticity). The soil will be dry and hard several inches down.
- The Fix: Provide deep, infrequent watering. Aim for about 1 to 1.5 inches of water per week, including rainfall. Water early in the morning so the grass dries quickly, reducing disease risk. It’s better to water deeply twice a week than to sprinkle daily.
Overwatering and Poor Drainage
Too much water is just as harmful. It suffocates roots, creating an ideal environment for fungal diseases that cause browning.
- Symptoms: Constantly soggy soil, a spongy feel underfoot, and the presence of algae or moss. Browning may appear in patches or low-lying areas where water collects.
- The Fix: Improve drainage by aerating the lawn. Adjust your irrigation schedule to allow the soil to dry out between waterings. Ensure your sprinkler system isn’t leaking or over-saturating specific areas.
Mowing Mistakes That Cause Damage
How you mow has a direct impact on lawn health. Incorrect mowing is a frequent culprit behind a brown bermuda grass lawn.
- Mowing Too Short (Scalping): Bermuda grass can handle low heights, but cutting off too much green leaf at once exposes stems and soil, causing browning and weed invasion. Never remove more than one-third of the grass blade in a single mowing.
- Dull Mower Blades: Blunt blades tear the grass instead of cutting it cleanly. These ragged tips turn brown, giving the entire lawn a dull, tan appearance even when it’s healthy.
- Mowing When Wet: This leads to uneven cuts, clumping, and can spread disease pathogens across the lawn.
The solution is simple: keep your mower blades sharp, mow at the recommended height for your bermuda variety (often between 1-2 inches for hybrid types), and only mow when the grass is dry.
Fungal Diseases That Lead To Browning
Several fungal diseases target bermuda grass, often manifesting as brown patches or rings. Overwatering and excessive thatch are common contributors.
Brown Patch Disease
This fungus is active during warm, humid weather. It creates circular brown patches that may have a darker “smoke ring” border visible in the early morning. The patches can range from a few inches to several feet in diameter.
Dollar Spot
As the name implies, this causes small, silver-dollar-sized brown spots that can merge into larger areas. You might see cobweb-like mycelium on the grass in the morning dew. It’s often linked to low nitrogen levels and moisture on the leaf blades.
Spring Dead Spot
This is a serious disease that appears in the spring as bermuda grass breaks dormancy. It leaves behind circular, bleached-out dead patches that can persist all summer. It’s a complex disease that infects the roots and rhizomes in the fall.
Managing Fungal Issues:
- Improve air circulation and sunlight penetration.
- Water deeply but infrequently, and only in the morning.
- Dethatch regularly to remove the layer where fungi thrive.
- Apply a fungicide as a preventive measure if you have a history of disease, or as a treatment following label instructions at the first sign of trouble.
Insect Infestations
Pests can chew on roots or blades, causing grass to wither and brown. Two major offenders for bermuda grass are:
Sod Webworms
These caterpillars feed on grass blades at night, leaving behind notched edges and eventually bare, brown patches. You may see small moths flying over the lawn at dusk.
Grubs
White grubs are the larvae of beetles. They live in the soil and feed on grass roots. The damaged grass will feel spongy, can be rolled back like a carpet, and will turn brown and die in irregular patches. Animals like skunks or birds digging up your lawn are a telltale sign of grubs.
To check for insects, perform a “tug test.” If a brown patch pulls up easily with no roots holding it, grubs are likely. For webworms, pour a soapy water solution (1 tablespoon dish soap per gallon) over a suspect area; they will come to the surface within a few minutes.
Soil Compaction And Thatch Buildup
Healthy grass needs air, water, and nutrients to reach its roots. Over time, soil can become compacted from foot traffic and equipment, creating a hard layer that blocks these essentials.
- Symptoms: Thin, weak grass that browns easily under stress, poor drainage, and difficulty pushing a screwdriver into the soil.
- The Solution: Core aeration. This process removes small plugs of soil, relieving compaction and allowing your lawn to breathe. It’s best done during the growing season when the grass can recover quickly.
Thatch is a layer of dead stems and roots between the soil and green grass. A thin layer is beneficial, but when it exceeds half an inch, it prevents water and nutrients from penetrating and harbors pests and disease.
- Solution: Dethatch using a vertical mower or power rake when the grass is actively growing, typically in late spring or early summer.
Nutrient Deficiencies And Soil PH
Your grass needs food. A lack of key nutrients, especially nitrogen, will cause slow growth and a pale yellow or brown color. Iron deficiency can also cause yellowing while the leaf veins remain green.
More fundamentally, soil pH that is too high (alkaline) or too low (acidic) locks up nutrients, making them unavailable to the grass even if they are present in the soil. Bermuda grass prefers a slightly acidic to neutral pH, between 6.0 and 7.0.
- Get a Soil Test: This is the most important step. A test from your local cooperative extension office will tell you exactly what your soil lacks and its pH level.
- Follow Recommendations: Apply a balanced, slow-release fertilizer based on the soil test results. For pH issues, apply lime to raise pH or sulfur to lower it as directed.
Chemical Damage From Herbicides Or Spills
Accidents happen. Gasoline, herbicide, or fertilizer spills can cause sudden, severe browning in distinct patterns. Herbicide drift from treating nearby weeds can also affect your bermuda grass.
- Prevention: Be careful when filling lawn equipment. Use herbicides selectively and according to label directions, avoiding application during hot, windy weather.
- Response: For spills, immediately dilute the area with copious amounts of water. Damaged areas may need to be reseeded or resodded after the contaminant is gone.
Diagnosing Your Brown Bermuda Grass Lawn
Use this simple step-by-step checklist to identify the problem.
- Check the Season: Is it late fall or winter? If yes, dormancy is the likely and normal cause.
- Check Your Watering: Probe the soil. Is it bone dry or constantly soggy? Adjust your watering accordingly.
- Look at the Pattern:
- Uniform brown: Likely dormancy or overall stress (water, mowing).
- Circular patches: Likely fungal disease or insect damage.
- Irregular or streaky patches: Could be chemical damage, uneven watering, or dull mower blades.
- Inspect the Grass and Soil:
- Pull on brown grass. Does it lift easily? Check for grubs.
- Look closely at individual blades for spots, lesions, or notched edges.
- Check for thatch and test soil compaction.
- Consider Recent Activities: Did you recently apply fertilizer, herbicide, or have a spill? Did you mow very short?
Step-By-Step Recovery Plan
Once you’ve diagnosed the issue, follow these steps to nurse your lawn back to health. Timing is crucial; most recovery should be done during the active growing season (late spring through summer).
Step 1: Correct Cultural Practices Immediately
Fix the basics first. Adjust your watering schedule to provide deep, infrequent soaks. Raise your mower height and ensure blades are sharp. These changes alone can spark a remarkable recovery.
Step 2: Aerate And Dethatch
If compaction or thatch is the problem, schedule core aeration and dethatching. This opens the door for water, air, and nutrients to reach the root zone.
Step 3: Conduct A Soil Test And Amend
Don’t guess about nutrients. Get a soil test and apply the recommended amendments—whether it’s fertilizer, lime, or sulfur—to correct the pH and nutrient balance.
Step 4: Apply Targeted Treatments
If insects or disease are confirmed, apply the appropriate insecticide or fungicide. Always choose a product labeled for use on bermuda grass and follow the instructions precisely for application rates and safety.
Step 5: Overseed Or Resod Bare Patches
For areas that have completely died, you may need to reintroduce grass. For small patches, overseeding with bermuda grass seed (for common bermuda) is an option. For hybrid varieties or large areas, resodding is the best choice. Loosen the soil in the bare spot, add a starter fertilizer, and keep the new seed or sod consistently moist until established.
Prevention Is the Best Long-Term Strategy
A healthy lawn is your best defense against turning brown. Implement a consistent yearly maintenance schedule:
- Spring: Apply pre-emergent herbicide if needed, dethatch, aerate if compacted, and apply a light fertilizer as growth begins.
- Summer: Mow regularly at the proper height, water deeply, and monitor for pests and disease. Apply a slow-release summer fertilizer.
- Fall: This is a critical time for bermuda grass. Apply a potassium-rich fertilizer to promote winter hardiness and root growth. Continue to mow until growth stops.
- Winter: Keep the lawn clear of leaves and debris. Avoid heavy traffic on the dormant grass.
FAQ About Bermuda Grass Turning Brown
Will Brown Bermuda Grass Come Back?
Yes, in most cases. If the browning is due to dormancy, drought, or correctable stress, it will green up again with proper care and the return of growing conditions. If the crowns and roots are dead from disease, pests, or severe damage, those specific areas may need to be replaced.
How Long Does It Take For Brown Bermuda Grass To Turn Green?
It depends on the cause. After a drought-breaking rain or corrected watering, you may see improvement within a week. Recovery from disease or insect damage with treatment can take 2-4 weeks. Seasonal green-up in spring happens gradually as soil temperatures rise over several weeks.
Should You Water Bermuda Grass When It’s Brown?
If it’s brown from winter dormancy, watering is not necessary and could be harmful if it leads to ice formation. If it’s brown from summer drought stress, yes, you should water it deeply to break dormancy. The grass will need about an inch of water per week to recover and stay green.
What Is The Difference Between Dormant And Dead Bermuda Grass?
Dormant grass is still alive in the crowns and roots. It will be uniformly brown and dry. Dead grass is often matted, may have a grayish color, and the crowns at the base of the plant will be dry, brittle, and pull apart easily. You can also test a small area by watering it consistently for a week or two; dormant grass will often show signs of green growth.
Can Fertilizer Fix Brown Bermuda Grass?
Only if the browning is caused by a nutrient deficiency, which a soil test can confirm. Applying fertilizer to grass that is brown from other causes like disease, insects, or overwatering can actually make the problem worse. Always diagnose before you treat.
Dealing with bermuda grass brown can be frustrating, but it’s usually a solvable problem. By observing carefully, correcting basic care mistakes, and taking targeted action, you can restore your lawn’s lush, green appearance. Remember, consistent, proper maintenance throughout the year is the key to preventing most browning issues before they even start.