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.
During the 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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