10 Best Fertilizer for St. Augustine Grass 2020 Reviews | Buying Guide

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Whenever I hear the name St. Augustine grass, my mind is filled with images of a serene, full lawn. Grass that grows and spreads really fast, with rough leaf textures and which is mid-dark green in color. And talking of resilience, you will never go wrong with St. Augustine lawn grass.

But then, you have to maintain the grass if you want always to feed your grass with the attractive natural outlook.

You must already know this, which is why you are now looking for the Best Fertilizer for St. Augustine Grass. We have compiled a list of 10, out of which, I am sure you will get your optimal choice.

Do you really want to know our top preference? The fertilizer that emerged top is Milorganite 0636 Organic Nitrogen Fertilizer. You want to know why? It brings almost all your lawns’ wildest dreams to reality, a well-maintained lawn with minimal maintenance activities. Stick with me for more on the fertilizer.

10 Top rated Best Fertilizer for St. Augustine Grass Reviews

1. Milorganite 0636 Organic Nitrogen Fertilizer

Topping the list of the best fertilizer for St. Augustine grass is this organic fertilizer. It will not only fertilize your lawn or grass field with sufficient nutrients, but it also ensures that you reduce the required maintenance errands. Let’s have a look at its features;

First, the fertilizer is organic, hence does not contain harmful chemicals. Even if your house is full of kids and pets, you have no reason to protect them when applying the fertilizer to your lawn.

Second, the Milorganite fertilizer reduces the need for frequent watering of the grass. You will only do it when it becomes too dry to ignore, since the glossy outlook lasts longer.

Third, you no longer have to mow the grass every so often. St Augustine grass grows faster than most grasses, you know. Imagine what happens after fertilization. You expect the growth rate to triple. Nevertheless, this fertilizer is different. Feeding slowly into the grass, you don’t have to worry about sudden mass growth.


  • Organic fertilizer, hence family friendly.
  • Reduces watering requirements hence cuts energy levels.
  • Less mowing, hence time and human resource-saving.


  • Not suitable for lawns with scattered grass, as it is slow in increasing the stretch of the grass.

2. Scotts Turf Builder Lawn Food

Next in line is the Scotts Turf Builder Lawn Food, whose impressive qualities rest in its strength.  And this strength is what it passes to your lawn grass. Thus, if you have a weak and distributed lawn grass, you should try this remedy.

Formulated to feed your grass with nutrients for strength continuously, the fertilizer ensures that your lawn problems are solved. This aspect will bring you a denser lawn, but it will also ensure that your grass chocks off weeds and maintains uniformity.

Additionally, the all-in-one Scott’s particle technology ensures that every place the particles land brings up greener and stronger grass.

To boost it all, the Turf Builder components create strong and deep roots. Hence, your lawn’s water and nutrient absorption capacity rises. Your desire to get a thicker lawn, coupled with St Augustine grass’s natural vibrancy, will finally come to a reality.

Most importantly, the company guarantees you that the fertilizer will not burn your lawn. So, the green uniformity you see after use will not be short-lived.

And, you can use the Scotts Turf Builder Lawn Food on any grass. So, if you have other grasses in your field, you can always fertilize them too.


  • Brings back greener and stronger lawn.
  • Does not burn the lawn.
  • Suitable for all grasses.


  • More watering required for better impact.

3. The Andersons PGF Complete 16-4-8 Fertilizer

Then we have The Andersons PGF Complete 16-4-8 Fertilizer, which is the best when you want to apply regardless of the season. Whether in summer, fall or spring, the fertilizer will still be suitable.

First, it contains Humic, fulvic acid, commonly known as Humic DG. It enriches the soil and ensures that plants absorb nutrients more efficiently.

Second, the particles in the package are so subtle that you will get twice the number of particles per square foot. Therefore, distribution will be more even, and absorption into the soil and, subsequently, the roots faster. Consequently, it will obviously take effect more swiftly than you anticipate of fertilizers.

For St Augustine grass, nitrogen levels of fertilizers have to be regulated. Within a whole year, 4 pounds in 1000sq. Ft field is more than enough. Taking this into consideration, the organic fertilizer has lower nitrogen strength. For this reason, you can apply more fertilizer within a square foot without the worry of affecting your lawn with thatch build-up.

For the eight weeks that you need the fertilizer to last, it will be slowly releasing nutrients into the grass, hence consistency in growth and outlook.


  • Uniform growth throughout the period.
  • Fine particles for more even spread.
  • Humic HD, which enriches the soil and adds to nutrient absorption ability.


  • Greening capability is lower than its competitors.

4. Scotts Turf Builder Bonus S Southern Weed & Feed2

When lawn grass weakens, it is bound to attract weeds. So, do you want to kill the two birds with a stone, strengthen the grass and, at the same time, kill the weeds?

Scotts Turf Builder Bonus S is poisonous to the dollar weed, clover and many other lawn weeds.

 Essentially, it feeds grass so that it is strong enough to crowd out and chock weeds that may emerge in future.  By creating strong deep roots, it strengthens your lawn grass against heat and drought. Adding to the resilience that St Augustine displays, you will be assured of long periods of a uniformly green lawn.

Built for southern lawns, you can be sure that all your lawn needs are taken into consideration. It will not burn your Southern grass, while it deals harshly with the weeds destroying the grass uniformity.

Then, with just a single bag, you can apply the fertilizer on a 5000sq. Ft lawn. Alternatively, if your lawn is larger, a bag suitable for 10,000sq. Ft is available.


  • Kills most Southern weeds, where St Augustine grass grows.
  • Feeds grass with sufficient nutrition.
  • Strengthens and deepens the roots for added resistance against heat and drought.


  • Minimal quantity size options available.

5. Southern AG Chelated Liquid Iron

Iron is one of the nutrients that plants cannot do without. The best thing about it is that it is easy to recognize a lack of iron in a plant. It starts at yellowing. This not only brings a dull outlook on your lawn; it also indicates that your plants are in dire need of an iron supplement. This is where Southern AG Chelated Liquid Iron comes in.

Basically, the chelated liquid iron adds iron to grass, flowers, vegetables, and even trees. So, you want the lush green lawn that your St Augustine grass should bring you? The fertilizer will grant you this request.

Nevertheless, you have to dilute the fertilizer when using it. One tablespoon for a full gallon is enough to make the difference that you want. Use a drenching spray to wet the grass with the mixture.

One thing that stands out for almost everyone who already used the product is that it takes effect very fast. Twenty-four hours after application, the difference in your grass will be visible.


  • Adds iron to lawn grass, preventing yellowing of the lawn.
  • Returns a natural near dark green color to St Augustine grass.
  • Highly effective.


  • You have to take care of the water fertilizer ratios.

6. Scotts Turf Builder Starter Food for New Grass

Did you just decide on starting off a new lawn with St Augustine grass? Or do you want to reseed, with the aim of having stronger root and blade grass? We just got you your choice fertilizer, Scotts Turf Builder Starter Food for New Grass. What’s so special about the fertilizer?

First and foremost, the fertilizer grows new grass 70% thicker and 35% faster than grass without the fertilizer. And just to freshen your memory, new grass grows slower, taking time to establish and adjust. On the other hand, you must be eager to see a blooming lawn.

To top it all, the fertilizer promotes faster root development, so that taking up water and nutrients starts almost immediately and effectively. Blade development also comes in, giving you the cute lawn look that you want.

Eager to get the ratios? 24-25-4, representing nitrogen, phosphorus, and potassium in the recommended ratios for all grasses. The grass will, therefore, start off with all it needs to blossom.

In addition, the fertilizer facilitates seeding, sod, and grass plugs, giving you faster and satisfactory results.


  • Best to start off new grass.
  • Facilitates faster and deeper root development.
  • Promotes thicker and longer blades.
  • It has recommended grass nutrient ratios.


  • Needs more watering for satisfactory results.

7. Urban Farm Fertilizers Liquid Lawn Fertilizer

Looking for a lawn fertilizer that contains all the grass nutrients, micro and macro, and also extras? The Urban Farm liquid fertilizer is a good shot, containing macro and micronutrients, enzymes, mycorrhizae, and even Humic acid.

Not to worry, because all these nutrients are balanced to ensure that your lawn is uniform, greener, and unburned. It follows the nitrogen phosphorus and potassium formula while ensuring that iron and others follow suit. Perfect nutrition is thus obvious.

A single gallon diluting into 256 gallons of full-strength foliar spray, you will have the advantage of taking care of 80,000sq. Ft.

With mycorrhizae, Humic acid, kelp, bat guano, worm casts, and root bio activating enzymes, your lawn will instantly fill the air with health, strength, and vigor.

Applying at least twice a month, your lawn will eventually pick the pace, leading in the neighborhood’s most attractive lawns.

And you know what the best part is? The company hand-crafted the fertilizer to suit lawns effectively. Having had success in hydroponics fertilizers, you can never anticipate better.


  • Highly balanced nutrient fertilizer.
  • Contains other growth components such and enzymes and Humic acid.
  • Covers a large area with a single package.
  • Brings a greener outlook on your St Augustine grass lawn.


  • You have to repeat the spraying every two weeks for some time to get optimal results.

8. Advanced 16-4-8 Balanced NPK

As summer draws near, lawn lovers get their chins down. Regardless of how much watering you give your lawn, the grass still seems dry after some time. This has to change, at least with this Advanced fertilizer formulation.

Most essentially, you can apply this fertilizer in summer, even you are far along the season. Actually, it is purposefully made for summer rejuvenation. You can also apply it in spring, and the results still are highly impressive.

With a 16-4-8 Nitrogen phosphorus potassium (N-P-K) formulation, you get a blend of the key macros for your lawn. And as though this was not enough, the fertilizer is graced with seaweed and fish.

Get your lawn back to perfect health with pure liquid nutrients, and quit avoiding the lawn due to the season. After all, summer is all about outdoor activities, right?

The fertilizer’s complete nutrition formula brings back a greener grass while strengthening and deepening the roots to add to their resilience. And St Augustine grass is among the most drought-resistant grasses in southern; a single boost will ensure that it withstands the whole seasons.


  • A perfect nutrient formulation for lawns.
  • Best for summer and spring seasons enhances grass resilience.
  • Greener lawn, stronger grassroots.
  • It also contains seaweed and fish for increased natural nutrition.


  • Season-selective for efficiency.

9. Simple Lawn Solutions Extreme Grass Growth Lawn Booster

The Simple Lawns Solutions Booster is a real growth booster, increasing lush grass growth both laterally and vertically. Also, you can use it for new sod or in seeding.

Specifically boosting nitrogen and phosphorus nutrients in grass, the fertilizer targets instant, yet consistent, growth in grasses.

Moreover, the fertilizer is also suitable for new lawns and lawn repair. Whether your lawn is uneven or distributed with the nutrients concentrated, soon, a positive change is bound to be visible. You also want the grass to take advantage of the existing minerals in the soil, right? This fertilizer will ensure that the grass takes this advantage.

The fertilizer activates seed germination and growth responses, hence faster growth. It also enhances chlorophyll production and natural enzyme activities, not to mention cell division and elongation.

The best part is that the fertilizer will impact growth rates in all grass types, so don’t worry if you have patches of other grass forms.

The fertilizer is easy to apply in a ready-to-use hose-end sprayer. You don’t need extra tools, as all this is already available when the package arrives.


  • Boosts growth hormones and activate enzymes in the grass for faster growth.
  • Suitable for all grass types.
  • Already has a hose and sprayer ready for use.
  • Also suitable for sod and seeding.


  • Suitable for smaller lawns.

10. Supper Juice All in One Soluble Supplement Lawn Fertilizer

Sometimes one fertilizer doesn’t seem enough, but again you feel that the grass does not really need a repeat. So, what you need is an intermediate fertilizer, a supplement for that matter. This Super Juice supplement is the best option that we got you, balanced with nutrients and perfect for supplementing primary fertilizers.

Most uniquely about the fertilizer is the fact that it is a dry mix of all nutrients, yet balanced to bring out each nutrient requirement. Hence, it will ultimately boost the impact of a former fertilizer to optimize your lawn’s outlook.

Being a supplement, you can use it in the 14-2-4 N-P-K ratio for a full acre of a lawn for a greener outlook. Supplementation requirements differ depending on the nutrition requirement of your lawn. Actually, some will simply use a 7-1-4 ratio and have a single bag fit 2 acres.

Nevertheless, the fertilizer can still be used as a primary fertilizer. In this case, you will have to double the ratios for maximum results.


  • Great supplementing fertilizer for a St Augustine lawn grass.
  • Covers larger field tracks.
  • Also acts as a primary fertilizer with increased ratio strength.


  • Quite expensive for a supplementing fertilizer.

How we Picked Top Products

Now, how did we even come up with this list, concluding that these are the best fertilizers for St Augustine grass? Just relax, and I will tell you.

You see, whenever we carry out product reviews, we make sure to incorporate real customer reviews on the products, product composition, and quality, performance, and even cost. Besides, we ensure to pick the best in each given category, ensuring that your specific lawn requirements are realized.

But why do all this matter? Just continue reading;

Customer reviews: Customers are honest, or at least most are, given that they gain nothing by lying. No product has a downside in its description. But the truth will always be out when the product is put to use.

As a customer, if you really liked the fertilizer, you will be eager to let others know and join you in the joy of a better-looking lawn. And if there was a fault in the fertilizer description, what is better than pouring out your frustration on paper?

Product Composition: You realize that different lawns have different lawn requirements, right? For this reason, we try as much as possible to get all the different lawn requirements and the different fertilizer composition for specific lawns.

So, as you read through our top products, you will note that each product is uniquely suited for a specific purpose on your St Augustine grass.

Performance: we get you the product that gives you the best performance in the long run. One, you won’t be disappointed when you buy, boosting your confidence, and lowering your anxiety as you await your order. You get the product shortcoming better, which you will be ready for, or for which you can avoid the product altogether.

In summary, it is cumbersome to flip through pages and pages of products, when each claim to offer St Augustine fertilizer needs. For this reason, we decide to handpick only the very best in the market, then compile them for you. Generally, we lessen your tasking search.

When to Fertilize St Augustine Grass?

Based on our research, you can actually fertilize St Augustine grass at any season of the year, be it summer, fall, or spring. Nevertheless, different fertilizers may be suited for different seasons. And, fortunately, you can get some that are great for all seasons.

The soil requirements may, however, differ depending on the season. For instance, in summer, it is evident that the soil will be drier. As you frequently water your lawn, feed it with nitrogen and iron to enhance the grass’s health and outlook.

All in all, other than the starter package, always fertilize St Augustine grass when it is at its peak. This way, you can first mow the lawn so as not to waste the fertilizers on leaves you won’t require. 2 ½ to 3 ½ inches, depending on the season, will be a perfect height to leave your grass for fertilizers.

Generally, it is advisable to apply fertilizer on St Augustine grass every eight weeks. This way, it will maintain its color, height, and thickness. Besides, you should interchange the fertilizers so that you meet all the grass requirements efficiently.

How to Fertilize St Augustine Grass?

Ever got stuck, despite having a manual on how to use something? This happens with grass fertilizer too, which is why a simple guide to take you through the process will be a perfect idea. And, you are reading the right article, as we will take you through a step by step procedure on how to fertilize St Augustine grass.

Step 1: Know the Measurements of the Lawn Section with St Augustine Grass

Fertilizers are packaged to suit different lawn requirements. If you are not sure, take measurements of your lawn. If in patches, you can record the different dimensions, then sum them up.

This will help you in knowing the exact package quantity you will require.

Moreover, it will also -come in ensuring you only dilute the fertilizer that you require if it is foliar.

Step 2: Read the Instructions on the Package

Fertilizers are different, depending on the company and composition. Therefore, to fully understand the exact measurements and usage, reading the general instructions is important.

If the fertilizer is ready-to-use, then you can start using it immediately; you get the package. Most ready-to-use fertilizers come with a hose and sprayer, which you will use. If the sprayer is not available, use your own.

If the fertilizer requires dilution, let’s proceed to step 2.

Step 3: Dilute the Fertilizer

Check for the dilution instructions. For instance, 1 gallon diluted into 20 gallons. If the diluted quantity exceeds your lawn size, then you can calculate the amount that you need. The rest can be used some other time.

Say the 1 gallon is to be diluted into 20 gallons, which will be fertilized in 5000sq ft, but your lawn is 3,000sq. Ft. This means that you dilute less fertilizer by 40% so that you don’t apply excessive fertilizer and burn your lawn. Excess fertilizer could not cause a burn, but a thatch effect will not be an impressive idea.

Step 4: Put the Foliar in a Sprayer and Spray it on the Grass.

Put the diluted fertilizer in your sprayer. If you have several, the largest will be suitable to avoid the constant refilling process.

Brace your lawn, with the motive of getting a difference within the said duration.

How much fertilizer does St. Augustine grass need?

St Augustine is highly resistant to drought, remember? Therefore, fertilizers only boost their outlook and resilience. But how much is enough to keep your lawn evergreen?

For nitrogen, 4 pounds on the grass is enough for the whole year. Once in the year, preferably in summer, ensure that you sprinkle iron fertilizer or one with a substantial amount.

Then, ensure that your grass gets all the nutrients, at least once in the year. And more frequently, ensure that you boost the grass growth and strength with phosphorus and potassium. Coupled with nitrogen, the three are key in ensuring a healthy lawn.

Moreover, ensure that you facilitate nutrient intake by apply fertilizers with enzymes, Humic acid, and more.

More specifically, it is vital to ensure that your grass gets all the nutrition it requires all year round. After every eight weeks, as mentioned earlier, ensure that your lawn gets a booster.

Parting Shot

When you are all about going green, with high regard for organic farming, then Milorganite 0636 Organic Nitrogen Fertilizer should bring you joy and satisfaction. When starting off a lawn or reseeding, get Scotts Turf Builder Starter Food for New Grass. And what about if the St Augustine lawn grass yellows? Counter the effect with Southern AG Chelated Liquid Iron.

In summary, I am trying to tell you that the list above has all that you need for the best fertilizer for St Augustine grass. Into the bargain are answers to most general questions you may have concerning St Augustine grass’s fertilization. So, now the ball is in your court. Get your most urgent fertilizer, sit back, and enjoy the lush greener impact.

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