A lush, green lawn is something many homeowners dream of. Unfortunately, even with the best care, lawns can develop patches of light green or yellow color grass that look out of place and unhealthy.
This article will explore the causes of light green and yellow grass patches in lawns. Also, provide tips on how to fix the problem and keep your lawn healthy and green.
Causes Of Light Green Grass Patches In Lawns And How To Fix Them
If you notice light green or yellow color patches on your lawn, there could be various reasons behind it. Here are some of the most common causes of light green or yellow grass patches in lawns and ways to fix them.
In This Article
Nutrient deficiencies are one of the most common causes of light green or yellow grass patches in lawns. Nitrogen (N), Phosphorus (P), and Potassium (K) are essential nutrients that your lawn needs to grow healthy and green.
If the soil lacks one or more of these nutrients, your lawn may develop patches of light green or yellow grass.
Solution:Fertilize Your Lawn
Fertilizing your lawn is the most effective way to address nutrient deficiencies. A high-quality organic lawn fertilizer will give your grass the essential nutrients it needs to grow healthy and green.
Soil compaction occurs when the soil becomes too dense, making it difficult for roots to grow and absorb nutrients. Over time, this can lead to the development of light green or yellow grass patches in your lawn.
Solution: Aerate Your Lawn
Aerating your lawn involves removing small plugs of soil, allowing air, water, and nutrients to reach the roots. This can help alleviate soil compaction and improve the overall health of your lawn.
Duringthe summer dry season, your lawn may not receive enough water to thrive. As a result, the grass can become light green, yellow, dry, and patchy.
Lack of water can also lead to soil compaction and nutrient deficiencies, further exacerbating the problem.
Solution: Water Your Grass
Water your lawn regularly to fix the discoloration caused by the summer dry season. You can use a sprinkler system or hose.
If you constantly have dry spells in your area or are considering replacing your grass, choose a drought-resistant variety that can better withstand dry conditions.
Additionally, avoid mowing your lawn too short during a dry season. Longer grass will shade the soil, which reduces water evaporation.
Thatch is a layer of dead grass, roots, and other organic material that accumulates on the surface of your lawn.
When this layer becomes too thick, it can prevent water and nutrients from reaching the grasses roots, causing light green or yellow patches.
Solution: Dethatch Your Lawn
If your lawn has a thick layer of thatch, dethatch it to allow water and nutrients to reach the roots of your grass.
Dethatching can be done using a specialized rake or machine to remove the layer of thatch from your lawn.
Certain insects, such as chinch bugs, feed on the grass sap until it withers, causing light green or yellow patches to develop. 
Other insects, such as Japanese beetle larvae, will cause damage to your lawn by eating the roots of your grass. This will also lead to the development of light green or yellow shade patches.
Solution: Treat for Insect Infestations
If you suspect insects are causing discolored patches in your lawn, treat your lawn with an organic insecticide.
Ensure to choose an insecticide that is safe for your kids, pets, and lawn.
Fungal diseases can cause light green or yellow patches to develop on your lawn. These diseases often thrive in warm, humid conditions and can quickly spread, causing much damage. 
Solution: Treat Fungal Diseases
If fungal diseases cause discoloration in your lawn, treat them with an organic fungicide.Ensure to choose the product that is safe for your kids, pets, and lawn.
Pet urine can cause light green or yellow grass patches in your lawn. Dog urine, in particular, is high in nitrogen, which can harm your lawn. When your dog urinates on your lawn, the nitrogen will burn the grass, leading to discolored patches. 
Solution: Train Your Pets
Preventing the harmful effects of pet urine on your lawn can be challenging. While removing your pet from the lawn is the only way to avoid the issue, this isn’t practical. So, limit your pet’s access to the most visible parts of your lawn. Create a designated, low visibility area for your pets to do their business.
Also, Immediately water the area where your pet has urinated. This will not entirely eliminate the damage, but it will minimize it.
Alternatively,take them for walks instead of letting them roam free in the yard.
Light Green Grass Patches In Lawn Frequently Asked Questions (FAQs)
Can I Use A Regular Fertilizer On My Lawn?
It is always better to use an organic, high-quality lawn fertilizer specifically designed for your type of grass. This will ensure that your lawn receives the nutrients it needs to grow healthy and green.
However, it is not easy to identify the type of grass if you do not sow it yourself. In that case, use a universal balanced organic lawn fertilizer.
What Is The Best Way To Mow My Lawn To Prevent Light Green Patches?
To prevent light green patches in your lawn, mow at the appropriate height using a sharp mower blade, and not removing more than one-third of the grass blade at a time.
When mowing, for most grass types, the minimum length should not be lower than 2 inches (5 cm). Allowing grass to grow to 3 inches (7.6 cm) or longer can be beneficial. This will let the grass efficiently manage its water and nutrient intake, leading to a stronger and healthy lawn.
Additionally, you should avoid mowing your lawn when wet, as this can rip grass out of the ground and lead to further lawn damage.
How Often Should I Water My Lawn With Light Green Grass Patches?
Trying to identify the reason why the lawn is light green or yellow should be the priority.
If the grass is light green due to nutrient deficiency or lack of water, water your lawn deeply once or twice a week rather than frequently with light sprinkling.
However, if the grass is light green due to fungal disease or insect infestation, reduce the watering.
Is It Possible To Fix Light Green Patches In My Lawn?
Yes, fixing light green patches in your lawn is possible by identifying and addressing the cause.
For example, if the cause of the patches is soil too dry, you will need to water that area regularly for a few weeks. If the cause is nutrient deficiencies, you can use a high-quality organic fertilizer to provide the necessary nutrients.
It is crucial to properly diagnose the cause of the problem before attempting to fix it.
Light green or yellow grass patches in your lawn can be unsightly and frustrating. Still, they can be prevented and treated with proper care and attention.
By maintaining a healthy lawn with proper watering, fertilizing, and mowing, you can enjoy a lush green lawn that is the envy of your neighbors.With patience and care, your lawn can be the green oasis you’ve always dreamed of.
Hopefully, you found the answer to what causes light green grass patches in lawns and how to fix them.
Check out our other“Lawn Care” guides. Read and learn more about how to manage your lawn issues. Also, discover more valuable insights in our “Garden Tools”section.
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- Use a slow-release fertilizer to ensure ideal amounts of nitrogen.
- Reduce grass wetness period by curtailing night watering.
- Remove excess thatch through regular aeration to help alleviate compaction and improve drainage.
- Mow at a high level in the morning, as this will allow grass blades to heal.
What is that light green grass in my lawn? If you are seeing a strange light green grass in the lawn, you are probably seeing foxtail or crabgrass. These are considered grassy weeds (different than broadleaf weeds like clover and dandelions).What causes yellow patches on grass? ›
Yellow grass is a sign of low nutrition and can be caused by too little water, too much water, blunt cutting blades on your mower, or lawn diseases. Water your lawn if it's too dry and aerate your soil if puddles are collecting. Sharpen your cutting blades on your mower for a cleaner cut.What causes light green patches in St Augustine grass? ›
Augustine grass. Infection is triggered by a combination of prolonged rainfall and stressed grass. Symptoms of infection begin as yellow or light green patches. The roots later turn an off-white color and begin to thin and develop black lesions.What fertilizer is good for yellow grass? ›
If your grass doesn't have enough nitrogen, your turf will eventually turn yellow. If a nitrogen deficiency is causing your yellow grass, the solution is simple: Apply a fertilizer with nitrogen.How do you fix light green grass? ›
In order to fix light green grass due to lack of sunlight, you can try removing the cause of shade by trimming trees, or you might want to switch to a grass type that prefers shady areas, such as tall fescue, fine fescue or perennial ryegrass.What causes grass to turn light green? ›
Your grass needs water to thrive. When your lawn isn't receiving enough water, it can start to wilt and ultimately turn pale green or yellow. PRO TIP: It's critical that you get on a proper lawn watering schedule. It's common for people to underestimate just how much water their lawn is receiving from Mother Nature.Will yellow lawn recover? ›
Can yellow grass recover? YES! By understanding the science and reasons why yellowing occurs, you will be able to fix and treat the yellowing with straightforward strategies. In an ideal situation with quality soil, good weather, and well watered and cared for grass, it may take just a week to recover it.How do you treat yellow grass fungus? ›
- Correct your watering regime.
- Water in the early morning instead of the evening.
- Remove grass clippings after you mow (otherwise, you'll spread the disease).
- Remove excessive thatch buildup.
- Mow the lawn regularly.
- Apply a fungicide in the affected area.
Yellow grass can be caused by overwatering or underwatering.
Unfortunately, overwatering the yard can drown grass roots and lead to less oxygen in the soil, which is essential for healthy, green grass.
The best way to revive St. Augustine grass is to give your lawn 1–1.5 inches of water every week, provide your soil with the correct nutrients, and eliminate any pests that may be killing the St. Augustine grass.What does overwatered St. Augustine grass look like? ›
Change in Color: Overwatered St. Augustine often changes in color. The blades take on a grayish-blue hue, instead of a deep green.What does lawn fungus look like on St. Augustine grass? ›
Remember, you are looking out for brown patches, yellow patches, thin turf, circular patches, and straw-colored spots of grass. These might be indicators of a disease or fungus in your St. Augustine. Inspect your sprinkler system to determine if you're overwatering your lawn or if water is pooling in areas.Can too much fertilizer turns grass yellow? ›
When you apply too much fertilizer or spill some by accident, the salt buildup can cause fertilizer burn. So, you'll see brown, yellow or streaked grass. This happens more often with quick-release fertilizers, which flood lawns with nutrients all at once.Does watering help yellow grass? ›
Excessively hot weather and areas that are exposed to full sun all day will dry out quickly, and the heat stresses the lawn. This results in yellow areas. Watering more frequently and deeply will usually correct the issue.How do you fix patchy St. Augustine grass? ›
If your grass is a St. Augustine grass lawn, you'll want to sod or plug your bare spots. Purchase a few pieces of sod or enough plugs to cover your bare spots from your local garden center. Then prepare the area by applying a generous layer of Scotts® Turf Builder® Lawn Soil.Can I just throw grass seed down on existing lawn? ›
Overseeding can help you get back to the thick, lush, green lawn you've always wanted. By spreading grass seed over your existing lawn, you can thicken up the thin areas, and your lawn will start to look terrific again. (This is different from reseeding, which is when you start over and plant a completely new lawn.)What kills grass in patches? ›
The best way to kill the existing lawn and weeds is to apply a nonselective herbicide, such as glyphosate, over the entire area. Glyphosate is a postemergence translocated herbicide that effectively kills turf and grassy and broadleaf weeds. Glyphosate is translocated rapidly in all actively growing plants.What can I put on my grass to make it green again? ›
The number one way to increase the green color in your lawn is with Nitrogen. Nitrogen is one of the big three macronutrients needed in the greatest quantities for healthy turf. It promotes top growth in the lawn by pushing the production of chlorophyll in the plant.How do you know if your lawn needs iron? ›
If your lawn is iron deficient, the condition is known as chlorosis. Leaves will be pale and take on a yellowish tint in between the veins. In extreme cases, the leaf blades might be a bit floppy and lacklustre. And as with any sort of malnutrition in lawns, the plants will be more susceptible to pests and diseases.
You can increase nitrogen in soil by adding nitrogen-rich fertilizer, composted manure, processed plant-based soil amendments, homemade compost, and even by planting certain crops that can pull nitrogen down into the soil from the atmosphere. These are all great sources of nitrogen for plants.How do I know if my lawn has fungus? ›
- Brown or “dead” looking spots on grass blades.
- Dead or dry looking spots on your lawn (despite regular irrigation)
- Discolored patches that grow in size.
- Threadlike or powdery coatings on grass blades.
'Sugar will help break down thatch, the layer of dead grass, and other organic material that can accumulate on your lawn over time, Lindsey says. 'This thatch can make it difficult for new grass to grow, but using sugar on your lawn can help break it down and improve the health of your lawn.What is the fastest way to green up your lawn? ›
- Apply an Iron Supplement. ...
- Create a Watering Schedule. ...
- Overseed. ...
- Set Up a Pet Potty Area. ...
- Consider Nitrogen-Rich Fertilizer. ...
- Eliminate Weeds and Pests. ...
- Mow Properly. ...
- Paint the Lawn With Grass Dye.
Consistent watering is crucial in turning your brown, lifeless lawn into a vibrant carpet of rich green. Grass seed must have consistent moisture to germinate and establish healthy roots, so respect this critical step. Water your lawn daily so the soil stays consistently moist.
How to fix it? A long, deep watering can help flush the fertiliser through the soil and away from the grass roots. If only one area looks damaged, then focus on that. Repeat every few days until the grass starts to recover.How often should you fertilize your lawn? ›
A well-fed lawn is healthier, which means it has a better root system to combat heat, cold, drought, mowing, foot traffic, and other stresses. While feeding your lawn once a year will improve its condition, feeding it 4 times a year will make it even healthier and more beautiful.What kills fungus but not grass? ›
One of the most effective methods is to use baking soda.
Baking soda helps to create an alkaline environment, which will help to kill the fungus. You can either spread baking soda on your lawn manually, or you can mix it with water and spray it on your lawn. Other natural killers include: Dish soap.
Some signs of disease include discoloration, brown and yellow patches of dead grass, the appearance of mushrooms, spots on leaves, or slimy/powdery residue among other examples.What does fungus damage to a lawn look like? ›
You'll find brown-ish, irregularly shaped patches that have what look like borders. Grass inside this ring will thin, since this foliar disease goes after your grass blades and not your lawn roots. And that can lead to bare spots or holes in your lawn. You will spot brown patch in late spring and early summer.
Watering on a daily basis is not beneficial to your lawn. Too much water can be just as damaging to plants as too little water and the excessive irrigation will invite future disease problems. Dry soil is an indicator that the lawn needs more water. If the soil is dry, it is dehydrated and needs water.Can over fertilizing cause yellow leaves? ›
Over-fertilizing. People often use too much fertilizer to make their plants grow faster. The excess salt in the soil from too much fertilizer “burns” the leaves causing them to turn yellow. In the case of houseplants, change the soil or leach it with large amounts of water to correct the balance.Does yellow mean over watering? ›
Yellow Leaves + Fading to Green + or Bright Yellow =
These symptoms together mean that your plant is overwatered. Usually lower leaves drop first, although the whole plant may be affected. The solution = repot (to remove soaked soil) and water less, or let soil dry out and water less.
Epsom salt is an organic compound that is full of beneficial minerals for lawns. Iron in Epsom salt, for example, helps grasses to grow healthy and strong. Meanwhile, the magnesium in Epsom salt balances the PH level in your grasses so that it doesn't become too acidic.Can dead St. Augustine grass come back? ›
Keeping grass safe, watering consistently, and improving soil quality are effective methods to revive St Augustine grass. It is very easy to get St Augustine grass to grow back after it has gone through a period of stress.Should you water St Augustine every day? ›
To keep your lawn healthy, water it only when the grass needs it. When you do water, wet the soil to a depth of 6 inches. Then don't water again until the grass shows symptoms of drought stress—a dull, bluish color, rolled or folded leaves, and persistent footprints.Why is my St. Augustine grass turning light yellow? ›
ANSWER: This yellowing is likely due to all of the rain. Rains leach nitrogen out of the soil, which causes some yellowing. Also, when the soil stays wet, grass roots are stressed and don't work as well. So the roots may not be properly absorbing minerals like nitrogen from the soil.What's the best time of day to water St. Augustine grass? ›
A: The best time is in the early morning hours (1:00am to 3:00am), prior to the dew. Watering in the late morning may be detrimental if it extends the time the lawn is naturally wet from dew, which may accelerate disease issues. Watering during the day wastes water due to excessive evaporation from the sun.What kills fungus on St. Augustine? ›
- Use fungicides containing at least two ingredients such as azoxystrobin and thiophanate-methyl.
- Avoid excess watering and ensure proper soil drainage to avoid water retention.
- Reduce the amount of nitrogen fertilizer you apply to your St. Augustine lawn because it holds water.
The best fertilizer for St Augustine grass is any fertilizer that has one pound of nitrogen for every 1,000 square feet of sod. Fertilizing every two months is ideal unless you apply slow release fertilizer that can be spread every 10 weeks.
Unfortunately, lawn fungus will typically not just go away on its own. Though there are some occasions it can start to resolve itself, more often than not, it's a problem that is likely to spread and grow worse if left untreated.Can yellow grass turn green again? ›
The fix for yellow grass is entirely dependent on the cause. Your yard may need more fertilizer or water, or it may be getting too much. The problems could be caused by animals or over-use. Below are a few things you can do to turn your yellow grass green quickly.Can you revive dead patches of grass? ›
Start by raking dead grass spots to loosen the soil and remove the expired blades. Lightly rake the healthy areas to get rid of dying grass and aerate the soil for root stimulation. Once you have the land prepared, take a rotary seed spreader and lay down new grass seed over the dead spots.Will yellow grass come back? ›
Thankfully, your dead grass will probably grow back with the proper care if you've caught the problem quickly (within about 3-5 weeks). Depending on why it died in the first place, you'll need to aerate, water, and/or manage unwanted pests.Should I water yellow grass? ›
Another very important aspect of yellow lawn care is to water deeply, but infrequently, in the morning when leaf blades will have time to dry. Fertilize as recommended and watch for weed competitors which can suck resources from the lawn.How do I get my lawn back green? ›
- Test Your Soil. Roots depend on healthy, nutritious soil to grow green and lush grass. ...
- Fertilize Your Lawn. A big part of knowing how to make your lawn greener is choosing the right fertilizer. ...
- Kill Weeds and Unwanted Insects. ...
- Use Grass Seed. ...
- Water Your Lawn. ...
- Aerate Your Lawn. ...
- Replace Lawn Mower Blades.
Depending on the type of grass in your garden, and how hot it is, this could happen in only a couple of days. It could also show that your grass has shallow roots - possibly caused by over-watering in the past (see below).How do I get my overwatered grass back? ›
How to Fix Overwatered Grass. Overwatering your lawn can be detrimental to the health of your grass and soil. If you notice any of the above signs, cut back on watering and let the soil dry out completely before watering again. You may also need to aerate the soil to improve drainage and root growth.What is killing my grass in patches? ›
Watering too Little (or too Much!)
Underwatering and overwatering are both probable causes for brown or dying grass. Underwatering creates drought-like conditions when there isn't enough rain to keep roots alive, and causes grass to die off.
The grass plants may appear dead to the naked eye, but deep inside the plant, there is a small area (called the crown) that is still alive. Once this crown gets moisture again, it will come to life and the turf will green up in 10-14 days.
Sugar is not typically used to fertilize a lawn, but as Tom suggests, it does have the power to ensure your grass appears greener. This is because sugar is a carbon that will intake excess nitrogen and promote a better a balance in the soil.How do you revive dead yellow grass? ›
- Remove the dead grass.
- Work up the exposed soil using a tool, such as a Garden Weasel Cultivator.
- Apply a generous amount of gypsum, such as Encap Gypsum Plus AST. ...
- Flush the spot with lots of water. ...
- Once the soil is workable, overseed with a quality grass seed mix such as Scotts EZ Seed Patch and Repair.