If you’ve just laid a beautiful new lawn, seeing patches of color change can be worrying. You’re probably asking, why is my sod turning brown, and what can you do about it? Let’s look at the common and not-so-common reasons this happens, so you can get your grass back to a healthy green.
New sod is like a transplant. It needs extra care and the right conditions to establish strong roots in your soil. Brown sod doesn’t always mean it’s dead. Sometimes, it’s a cry for help, signaling a problem you can fix. Other times, it’s a natural part of the settling-in process. The key is to figure out which is which, and act quickly.
This guide will help you diagnose the issue. We’ll cover everything from simple watering mistakes to hidden fungal problems. With clear steps, you can identify the cause and take the right action to save your lawn.
Why Is My Sod Turning Brown
The first step is diagnosis. Don’t just start watering more or applying fertilizer. Look closely at the pattern, feel the soil, and consider the timing. Is the browning in strips, circles, or random patches? Is the grass dry and brittle, or mushy? Did it happen suddenly or gradually? Your answers point to the culprit.
Here are the primary categories of causes for brown sod:
* Watering Issues: Too much or too little.
* Soil & Root Problems: Poor contact, compaction, or bad soil.
* Disease & Fungus: Often encouraged by weather and care mistakes.
* Insect Damage: Pests feeding on roots or blades.
* Environmental Stress: Heat, cold, or chemical burn.
* Natural Processes: Normal dormancy or initial shock.
Let’s break each of these down in detail.
Watering: The Most Common Culprit
Improper watering is the number one reason new sod fails. It seems simple, but getting it right is crucial. The goal is to keep the sod moist enough to root without drowning it or letting it dry out.
Underwatering: The Obvious Suspect
New sod has a very shallow root system. It can’t reach deep into your soil for moisture yet. It relies entirely on what you provide from above.
* Signs: Grass blades look dry, curled, and brittle. The brown color is often uniform across large areas, especially in full sun. The soil underneath will be dry and hard to the touch.
* The Fix: You need to water immediately and deeply. For the first two weeks, sod may need watering 1-2 times per day, especially if it’s hot and windy. The key is to keep the sod and the top inch of soil beneath it consistently moist. Lift a corner to check. The sod should feel damp, not soggy.
Overwatering: The Silent Killer
This is a more sneaky problem. Too much water is just as bad as too little. It drowns the roots, pushing oxygen out of the soil. This creates the perfect environment for rot and disease.
* Signs: Grass feels soft, mushy, and may have a slimy texture. You might see algae or moss growing. The browning can be patchy. The ground will feel spongy and waterlogged.
* The Fix: Reduce watering frequency immediately. Allow the soil to dry out slightly between waterings. Improve drainage if the area is consistently soggy. Aerating the soil can help it breathe once the sod is established.
Watering Pro-Tip: Water in the early morning. This gives the grass blades time to dry before evening, reducing fungus risk, and minimizes water loss to evaporation.
Soil and Root Contact Problems
Your sod’s health depends entirely on what’s beneath it. If the sod can’t make good contact with your soil, the roots won’t grow.
Poor Soil Preparation
Laying sod on hard, compacted, or rocky soil is a recipe for failure. The roots hit a barrier and can’t penetrate.
* Solution: Before laying sod, the soil should be loosened, graded, and amended if needed. If sod is already down and struggling, core aeration can help once it’s rooted enough to handle the process.
Lack of Root-to-Soil Contact
This is critical in the first two weeks. If the sod rolls weren’t laid tightly together, or if air pockets are trapped underneath, the roots dry out and die.
* The Test: Gently lift a corner of brown sod. If it comes up easily with no white roots visible trying to grow into the soil, you have a contact issue.
* The Fix: During installation, sod should be rolled or tamped down firmly. For existing sod, you can rent a lawn roller (fill it with water) and gently roll the area when the soil is moist (not wet) to improve contact.
Lawn Diseases and Fungal Infections
Fungi love warm, moist conditions. Overwatering, watering at night, or high humidity can trigger outbreaks. Here are two common ones:
Brown Patch Disease
This fungus causes circular or irregular brown patches, sometimes with a darker “smoke ring” border on the outer edge. Inside the patch, individual grass blades may have lesions.
* Management: Reduce evening moisture. Water in the AM. Improve air circulation. Fungicides may be necessary for severe cases.
Dollar Spot
As the name suggests, it starts as small, silver-dollar-sized bleached or straw-colored spots. These spots can merge into large, irregular brown areas.
* Management: Often linked to low nitrogen. A balanced fertilizer can help. Ensure proper watering and consider a fungicide if the problem persists.
Always try to correct the environmental conditions (moisture, airflow) first before turning to chemicals. Fungus is a sign of an imbalance.
Insect Infestations
Pests can cause damage that looks like drought or disease. You need to get on your hands and knees and investigate.
Grubs
These white, C-shaped larvae live in the soil and feed on grass roots. The sod will feel spongy and you can peel it back like a carpet because the roots are gone.
* Check: Dig up a small, brown section about 1 foot square and 3 inches deep. If you see more than 5-10 grubs, treatment is needed.
* Treatment: Apply a targeted grub control product according to the label’s timing instructions.
Sod Webworms
The moths are harmless, but their larvae chew grass blades at night. You’ll see notched blades and small brown patches that grow.
* Check: Look for greenish pellets (frass) and silken tunnels in the thatch. Pour a soapy water solution (1 tbsp dish soap per gallon) on a brown edge; larvae will come to the surface.
* Treatment: Insecticides labeled for sod webworms can be effective.
Environmental and Physical Stress
Sometimes, the cause isn’t biological—it’s physical or chemical.
Heat and Drought Stress
Even with watering, extreme heat can scorch new sod. The grass may go dormant (a survival tactic) and turn brown.
* Response: Increase watering frequency during heatwaves. Provide water in the cooler parts of the day. The grass may green up when temperatures moderate.
Fertilizer or Chemical Burn
Too much fertilizer, herbicide, or even pet urine can cause sharp, localized browning. The grass dies quickly, often with a yellow border.
* Signs: Browning occurs shortly after an application. Patterns may follow spreader lines or dog run paths.
* Solution: Dilute the area with heavy, deep watering to flush the soil. Reseed or resod the dead patches once the chemical has dissipated.
Dormancy: A Natural Process
Cool-season grasses (like Kentucky Bluegrass or Fescue) naturally turn brown and go dormant in summer heat if water is scarce. Warm-season grasses (like Bermuda or Zoysia) do the same in the winter cold.
* Is it Dead? Dormant grass crowns (the base of the plant) are still alive. Pull on a brown blade; if the crown is firm and whitish, it’s dormant. If it’s mushy and pulls out easily, it’s dead.
* Action: For seasonal dormancy, you can let nature take its course. The grass will green up when the season changes. To prevent summer dormancy, provide consistent deep watering.
A Step-by-Step Diagnostic Guide
Follow this simple flowchart when you see brown sod:
1. Check the Soil Moisture. Push a screwdriver into the soil under the brown patch. Is it bone dry, soggy, or just right?
2. Do the Tug Test. Gently pull on a handful of brown grass. Does it resist (dormant or diseased) or come up easily with no roots (grubs or poor contact)?
3. Inspect the Pattern. Are the brown spots circular, irregular, striped, or uniform? Circular spots often mean fungus or insects.
4. Look Closer. Get down and examine individual grass blades and the soil surface. Look for lesions, bugs, webbing, or mushrooms.
5. Review Your Recent Actions. Did you just fertilize? Has it been extremely hot? Did you change your watering schedule?
6. Consider the Season. Is it the time of year when your grass type normally goes dormant?
Treatment and Recovery Steps
Once you’ve identified the likely cause, take these action steps:
For Underwatered Sod:
* Water deeply and immediately.
* For the next 10-14 days, water 1-2 times daily to keep the sod and topsoil moist.
* Gradually reduce frequency, encouraging deeper root growth.
For Overwatered Sod:
* Stop watering until the soil is dry to the touch a few inches down.
* Switch to a less frequent, deeper watering schedule.
* Aerate the lawn to improve oxygen flow to the roots.
For Fungal Issues:
* Adjust watering to early morning only.
* Mow when grass is dry, and ensure your mower blade is sharp.
* Apply a fungicide as a last resort, following label directions exactly.
For Insect Damage:
* Identify the pest correctly.
* Apply the appropriate insecticide at the right time of year for that pest.
* Encourage beneficial insects and birds with a diverse garden.
For Poor Soil Contact:
* Gently roll the lawn with a water-filled roller when soil is slightly moist.
* Ensure all seams and edges are firmly pressed into the soil.
General Recovery Care:
* Mow High: Don’t cut new sod too short. Keep it at 3 inches or higher to shade roots and reduce stress.
* Hold Off on Fertilizer: Don’t fertilize new sod immediately unless your soil test shows a severe deficiency. Wait 4-6 weeks.
* Limit Traffic: Keep people and pets off the new sod for at least the first month.
Prevention: The Best Medicine
The best way to deal with brown sod is to prevent it from happening in the first place.
* Prep the Soil Properly: Till, grade, and amend your soil before the sod arrives. This is the most important step.
* Water Wisely: Follow a strict watering schedule for new sod, adjusting for weather. Invest in a timer for your sprinkler.
* Lay Sod Quickly: Install sod the same day it’s delivered. Don’t let it sit rolled up.
* Choose the Right Grass: Select a type suited to your climate, sun exposure, and intended use.
* Test Your Soil: A simple soil test can tell you if you need to adjust pH or add nutrients before you even start.
Remember, patience is key. Establishing a lush lawn from sod takes a full growing season. Don’t panic at the first sign of brown. Diagnose, treat, and give your grass the conditions it needs to thrive.
FAQ: Your Brown Sod Questions Answered
Q: How long does it take for new sod to root?
A: Under ideal conditions, sod starts to knit into the soil in about 10-14 days. Full establishment, where it can’t be easily lifted, takes 3-6 weeks.
Q: Can brown sod turn green again?
A: Yes, absolutely. If the brown is due to dormancy, underwatering, or some types of stress, it will often green up again with proper care. If the crowns are dead, it will not recover.
Q: Should I water brown sod?
A: First, diagnose why it’s brown. If the soil is dry, yes, water it deeply. If the soil is already soggy, watering will make the problem worse.
Q: Is it normal for new sod to turn brown?
A: A little bit of initial browning at the seams or edges can be normal as it acclimates. Widespread browning is not normal and indicates a problem.
Q: What does overwatered sod look like?
A: It often looks limp, yellowing, or has a grayish cast. It will feel mushy underfoot, and you might see algae. The roots will be brown and smell foul if severely rotted.
Q: How can I tell if my sod is dormant or dead?
A: Do the tug test. Dormant grass has living crowns that hold the blades firmly. Dead grass pulls up easily with no resistance. Also, check the crown’s color—white or cream is good, brown and mushy is bad.
Q: When should I mow new sod for the first time?
A: Wait until it has rooted firmly enough that it doesn’t lift when you gently tug. This is usually around 2-3 weeks. Mow high, and make sure your mower blade is razor sharp.
By understanding the hidden causes behind brown sod, you can move from worry to action. With careful observation and these targeted solutions, you’ll be well on your way to restoring the vibrant, healthy lawn you envisioned.