This post contains affiliate links. As an Amazon Associate I earn from qualifying purchases. If you click a link and make a purchase, I may receive a small commission at no extra cost to you.
Yes, you can use 13-13-13 fertilizer on centipede grass, but only under very specific conditions and with caution.
This balanced fertilizer, which contains equal parts nitrogen, phosphorus, and potassium, isn’t typically the first choice for centipede grass lawns.
If you’ve been wondering whether 13-13-13 fertilizer is safe for your centipede grass, the short answer is yes, but it’s not the ideal option for most situations.
In this post, we’ll break down when using 13-13-13 on centipede grass makes sense, when it can cause problems, and what you should know before you spread it.
Let’s dig into the details so you can make the best choice for your lawn.
Why You Can Use 13-13-13 Fertilizer on Centipede Grass
You can use 13-13-13 fertilizer on centipede grass because it provides a balanced ratio of essential nutrients that the grass needs for basic growth.
Centipede grass is known for being low-maintenance and thrives in poor, sandy soils where other grasses struggle.
However, this doesn’t mean it never needs fertilization, it just needs far less than most other warm-season grasses.
The key thing to remember is that using 13-13-13 fertilizer on centipede grass should be done sparingly and only when your soil test shows a deficiency in phosphorus or potassium.
Let’s explore the specific reasons why this fertilizer can work for your lawn.
1. Balanced Nutrition for New Lawns
When you’re establishing a new centipede grass lawn from seed or sod, using 13-13-13 fertilizer on centipede grass can help young roots develop quickly.
The phosphorus in 13-13-13 is crucial for root development, and young centipede grass needs that boost to anchor itself into the soil.
The potassium helps with overall plant health and drought tolerance, which is beneficial during the establishment phase.
Many lawn care experts recommend a balanced fertilizer like 13-13-13 for new lawns because it provides everything the young grass needs in one application.
Once your centipede grass is established, though, you’ll want to switch to a high-nitrogen, low-phosphorus fertilizer instead.
2. Fixing Nutrient Deficiencies in Poor Soil
Centipede grass naturally grows in acidic, sandy soils that often lack phosphorus and potassium.
If a soil test reveals that your lawn is deficient in these nutrients, you can use 13-13-13 fertilizer on centipede grass to correct the imbalance.
The phosphorus helps with energy transfer within the plant, while potassium strengthens cell walls and improves disease resistance.
Without these nutrients, your centipede grass might look pale, grow slowly, or become more susceptible to pests.
Just remember that this should be a corrective measure, not a regular feeding schedule.
3. Slow-Release Formulas Are Safer
If you decide to use 13-13-13 fertilizer on centipede grass, look for a slow-release or controlled-release formula.
Slow-release 13-13-13 breaks down gradually over several weeks, feeding your centipede grass a steady supply of nutrients without overwhelming it.
Fast-release versions can deliver too much nitrogen at once, which can burn the grass or cause rapid, weak growth.
Applying a slow-release 13-13-13 in early spring, just as the grass is greening up, gives your centipede grass the nutrients it needs without the risk of fertilizer burn.
When You Should Avoid Using 13-13-13 on Centipede Grass
While you can use 13-13-13 fertilizer on centipede grass in certain scenarios, there are times when you should absolutely avoid it.
Centipede grass has very specific nutritional needs, and over-fertilizing is one of the most common reasons these lawns fail.
Here’s when you should skip the 13-13-13 and choose something else instead.
1. Established Lawns Need Very Little Phosphorus
Mature centipede grass doesn’t need much phosphorus, and most soils already have enough of it.
Using 13-13-13 fertilizer on centipede grass that’s already established can lead to a phosphorus buildup in the soil over time.
Excess phosphorus can tie up other nutrients like iron and zinc, causing centipede grass to develop yellowing leaves.
This condition, known as iron chlorosis, is a common problem in centipede grass lawns that receive too much balanced fertilizer.
For established lawns, a fertilizer with a ratio like 15-0-15 or 16-4-8 is much better suited to centipede grass needs.
2. High Nitrogen Can Cause Thatch Buildup
The nitrogen in 13-13-13 fertilizer on centipede grass can promote lush, fast growth, but that’s not always a good thing.
Centipede grass naturally produces thatch, and excessive nitrogen accelerates the buildup of dead grass material at the soil line.
Too much thatch prevents water and air from reaching the roots, making your lawn more prone to drought stress and disease.
If you apply 13-13-13 too often or in high amounts, you’ll end up with a spongy, unhealthy lawn that requires frequent dethatching.
3. Over-Fertilizing Weakens Centipede Grass
Centipede grass is a low-feeding grass, and it actually prefers lean soil conditions.
When you use 13-13-13 fertilizer on centipede grass too heavily, the grass becomes soft and succulent, which attracts pests like chinch bugs.
It also makes the lawn more susceptible to large patch fungus, a common disease that can kill off large areas of centipede grass.
The best approach is to fertilize lightly, no more than one to two pounds of nitrogen per 1,000 square feet per year.
How to Apply 13-13-13 Fertilizer on Centipede Grass Safely
If you’ve determined that your lawn needs the balanced nutrition, here’s how to use 13-13-13 fertilizer on centipede grass without causing harm.
Following these steps will help you get the benefits while minimizing the risks.
1. Test Your Soil First
Before applying any fertilizer, test your soil to see what nutrients are actually missing.
Many university extension offices offer affordable soil testing that will tell you exactly what your centipede grass needs.
If your soil already has adequate phosphorus and potassium, skip the 13-13-13 altogether.
2. Apply in Early Spring Only
The best time to use 13-13-13 fertilizer on centipede grass is in early spring, after the last frost and when the grass starts to green up.
Apply it at a rate of about half a pound of nitrogen per 1,000 square feet, which means roughly 4 pounds of 13-13-13 per 1,000 square feet.
Water the fertilizer in immediately after application to help it reach the roots and prevent burn.
3. Avoid Summer Applications
Never apply 13-13-13 fertilizer on centipede grass during the hot summer months.
Summer fertilization stresses centipede grass and can lead to disease problems.
If you miss the early spring window, simply wait until the following year rather than risking a late application.
So, Can You Use 13-13-13 Fertilizer on Centipede Grass?
You can use 13-13-13 fertilizer on centipede grass, but it should only be done under specific circumstances.
For new lawns, correcting a confirmed phosphorus or potassium deficiency, or using a slow-release formula in early spring, 13-13-13 can be a helpful tool.
For established centipede grass lawns with healthy soil, using 13-13-13 is generally unnecessary and can lead to thatch buildup, nutrient imbalances, and increased pest pressure.
The safest approach is to always test your soil first and follow the specific recommendations for centipede grass, which favor low nitrogen and minimal phosphorus.
While 13-13-13 fertilizer on centipede grass won’t kill your lawn overnight, repeated heavy applications will definitely cause long-term problems.
So use it wisely, or better yet, choose a fertilizer formulated specifically for centipede grass to keep your lawn happy and healthy.
Hope this clears up whether you can use 13-13-13 fertilizer on centipede grass and helps you make the right call for your yard.