Can You Use St Augustine Fertilizer On Bermuda Grass

Yes, you can use St. Augustine fertilizer on Bermuda grass, but there are some important caveats you need to know before you do.
 
Using St. Augustine fertilizer on Bermuda grass isn’t inherently harmful, but the two grasses have different nutritional needs and growth cycles that could make this a less-than-ideal choice.
 
If you’re wondering whether you can use St. Augustine fertilizer on Bermuda grass, the short answer is that the product will work, but you may end up with a lawn that doesn’t look its best.
 
In this post, we’ll break down why you can use St. Augustine fertilizer on Bermuda grass, what the differences are, and how to make the right call for your lawn.
 
Let’s dig into the nitty-gritty of feeding your Bermuda grass the right way.
 

Why Using St. Augustine Fertilizer on Bermuda Grass Can Work

The reason you can use St. Augustine fertilizer on Bermuda grass comes down to the basic nutrients every lawn needs.
 
Both St. Augustine and Bermuda grass require nitrogen, phosphorus, and potassium for healthy growth.
 
St. Augustine fertilizer is formulated with these macronutrients, so it won’t poison your Bermuda lawn or cause immediate damage.
 
However, the ratios in St. Augustine fertilizer are often different from what Bermuda grass prefers, which brings us to the key differences.
 

1. Nutrient Ratios: The Main Difference

St. Augustine fertilizer typically has a lower nitrogen content compared to what Bermuda grass prefers.
 
For example, a common St. Augustine fertilizer might have an N-P-K ratio like 15-5-10 or 16-4-8.
 
Bermuda grass, on the other hand, thrives on higher nitrogen formulas like 21-7-14 or 16-6-8.
 
When you use St. Augustine fertilizer on Bermuda grass, you’re giving it less nitrogen than it wants, which can lead to slower, paler growth.
 
The phosphorus and potassium levels in St. Augustine fertilizer are usually fine for Bermuda, but the nitrogen shortfall is the real issue.
 
So while you can use St. Augustine fertilizer on Bermuda grass, you might notice your lawn looking a bit lackluster over time.
 

2. Slow-Release vs. Quick-Release Formulas

Many St. Augustine fertilizers feature slow-release nitrogen, which is great for St. Augustine’s steady feeding habits.
 
Bermuda grass is a heavy feeder that responds better to quick-release nitrogen during its active growing season.
 
If you use St. Augustine fertilizer on Bermuda grass, the slow release may not deliver the fast green-up Bermuda is known for.
 
This means your Bermuda lawn might not recover as quickly from wear or stress when fed with St. Augustine fertilizer.
 
That said, slow-release isn’t bad, it just means you’ll need to apply it more often to match Bermuda’s appetite.
 

3. Iron and Micronutrient Additions

St. Augustine fertilizer often includes extra iron to keep those broad blades nice and dark green.
 
Bermuda grass also benefits from iron, so this is one area where using St. Augustine fertilizer on Bermuda grass actually helps.
 
The extra iron in St. Augustine fertilizer can give your Bermuda lawn a deeper color that many homeowners love.
 
So it’s not all bad news, there are some perks to this crossover.
 
Just remember that the overall nutrient profile is still designed for a different grass type.
 

What Happens If You Use St. Augustine Fertilizer on Bermuda Grass?

Now that we’ve covered the basics, let’s talk about realistic outcomes.
 
Using St. Augustine fertilizer on Bermuda grass a few times won’t ruin your lawn.
 
But if you make it a long-term habit, you could see a few issues popping up.
 
Here’s what to watch for.
 

1. Slower Growth and Thinner Turf

Because St. Augustine fertilizer has less nitrogen, your Bermuda grass won’t grow as vigorously.
 
This could mean a thinner lawn that’s more prone to weeds and bare spots.
 
Bermuda grass needs that nitrogen boost to spread and fill in quickly, especially after summer stress.
 
Using St. Augustine fertilizer on Bermuda grass might leave your lawn looking a bit patchy.
 
If you’re okay with a slower-growing lawn, this might not be a big deal for you.
 
But if you want that thick, carpet-like Bermuda look, you’ll want a fertilizer with more nitrogen.
 

2. Potential for Over-Fertilizing in Fall

St. Augustine fertilizer often contains a good chunk of potassium for root strength, which is great for winter hardiness.
 
But Bermuda grass has a different dormancy schedule than St. Augustine.
 
If you apply St. Augustine fertilizer on Bermuda grass in late fall, you might push growth that shouldn’t happen.
 
That late growth can make Bermuda more susceptible to winter kill.
 
So timing matters just as much as the fertilizer itself.
 
Bermuda grass should be fertilized in late spring through summer, not into fall.
 
Sticking with a Bermuda-specific fertilizer schedule will help avoid this issue altogether.
 

3. Risk of Nutrient Imbalance Over Time

Using St. Augustine fertilizer on Bermuda grass repeatedly can lead to phosphorus buildup in your soil.
 
Most soils already have enough phosphorus, and excess can actually harm your lawn’s ability to absorb other nutrients.
 
You might start seeing yellowing or weak growth even though you’re fertilizing regularly.
 
That’s why it’s always smart to do a soil test before you commit to any fertilizer program.
 
But as a quick rule, Bermuda grass prefers a higher nitrogen ratio than St. Augustine fertilizer provides.
 

When You Should Use St. Augustine Fertilizer on Bermuda Grass

There are actually a few situations where using St. Augustine fertilizer on Bermuda grass makes perfect sense.
 
So before you toss that bag, consider these scenarios.
 

1. You Have a New Bermuda Lawn

Young Bermuda grass can be sensitive to high-nitrogen fertilizers.
 
A gentler St. Augustine fertilizer might be a safer choice for the first few feedings.
 
This can help establish roots without burning tender new growth.
 
Once your Bermuda is well-established, you can switch to a Bermuda-specific blend.
 

2. You’re Overseeding in Winter

If you overseed your Bermuda lawn with ryegrass for winter color, St. Augustine fertilizer can be a decent match.
 
The balanced nutrients will feed the ryegrass without overwhelming your dormant Bermuda.
 
Just use it sparingly and stop well before spring green-up.
 

3. You’re Out of Options

It’s better to use St. Augustine fertilizer on Bermuda grass than to skip fertilizing altogether.
 
Your lawn still needs nutrients, even if the ratios aren’t perfect.
 
So if you’ve got a bag of St. Augustine fertilizer lying around, go ahead and use it.
 
Just don’t make it your only fertilizer for the entire season.
 

So, Can You Use St. Augustine Fertilizer on Bermuda Grass?

Yes, you can use St. Augustine fertilizer on Bermuda grass, but it’s not the ideal choice for a thriving Bermuda lawn.
 
You can use St. Augustine fertilizer on Bermuda grass if you’re in a pinch, but long-term results will be better with a Bermuda-specific blend.
 
The main downside is the lower nitrogen content, which can slow growth and reduce that lush, green density Bermuda is famous for.
 
If you do use St. Augustine fertilizer on Bermuda grass, remember to adjust your schedule and keep an eye on how your lawn responds.
 
You can use St. Augustine fertilizer on Bermuda grass as a temporary measure, but for the best lawn possible, grab a fertilizer labeled for Bermuda grass.
 
Your Bermuda lawn will thank you with faster growth, deeper color, and a thicker, healthier turf all season long.