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Best Fertilizers for St. Augustine Grass

Not all fertilizers are created equal. The difference between the best fertilizers out there and average fertilizers is drastic. It can mean the difference between a lifeless lawn and a luscious green lawn.

Our top recommendation is…

Greenpinky’s Top Pick
  • Perfect nutrient balance
  • Quality ingredients
  • Great price
Check Amazon for Best Price

Giving your St. Augustine grass the right fertilizer is vital for the well-being of your grass. It can be challenging to identify the best fertilizer to buy. You want a fertilizer that delivers the right nutrients to your St. Augustine grass’s root zone. In this post, I will take the frustration and guesswork out of choosing the best fertilizer for your lawn. Keep on reading my article to learn more! I’ve got some reviews of the best fertilizer for St. Augustine grass and features and benefits listed to help you.

Comparing Our Top 3 Recommendations for St Augustine Fertilizers

18-3-6 Liquid Fertilizer (50% SRN & Micronutrients) (2.5 Gallons)
GreenPinky's Top Pick
The Andersons PGF Complete 16-4-8 Fertilizer with Humic DG 5,000 sq.ft.
Advanced 16-4-8 Balanced NPK - Lawn Food Quality Liquid Fertilizer - Spring & Summer Concentrated Spray - Any Grass Type - Simple Lawn Solutions (32 Ounce)
18-3-6 Liquid Fertilizer (50% SRN & Micronutrients) (2.5 Gallons)
The Andersons PGF Complete 16-4-8 Fertilizer with Humic DG 5,000 sq.ft.
Advanced 16-4-8 Balanced NPK - Lawn Food Quality Liquid Fertilizer - Spring & Summer Concentrated Spray - Any Grass Type - Simple Lawn Solutions (32 Ounce)
N-P-K: 18-3-6
N-P-K: 16-4-8
N-P-K: 16-4-8
83 Reviews
1,921 Reviews
3,562 Reviews
$69.95
$34.88
$24.77
18-3-6 Liquid Fertilizer (50% SRN & Micronutrients) (2.5 Gallons)
18-3-6 Liquid Fertilizer (50% SRN & Micronutrients) (2.5 Gallons)
N-P-K: 18-3-6
83 Reviews
$69.95
GreenPinky's Top Pick
The Andersons PGF Complete 16-4-8 Fertilizer with Humic DG 5,000 sq.ft.
The Andersons PGF Complete 16-4-8 Fertilizer with Humic DG 5,000 sq.ft.
N-P-K: 16-4-8
1,921 Reviews
$34.88
Advanced 16-4-8 Balanced NPK - Lawn Food Quality Liquid Fertilizer - Spring & Summer Concentrated Spray - Any Grass Type - Simple Lawn Solutions (32 Ounce)
Advanced 16-4-8 Balanced NPK - Lawn Food Quality Liquid Fertilizer - Spring & Summer Concentrated Spray - Any Grass Type - Simple Lawn Solutions (32 Ounce)
N-P-K: 16-4-8
3,562 Reviews
$24.77
St augustine grass2
Healthy St. Augustine Grass

The Best St. Augustine Grass Fertilizers

These are the best fertilizers for St. Augustine grass. They use quality ingredients and are much better than the other fertilizers on the market. Please keep reading below to learn more about each one. 

St augustine close up

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The top recommendation for St. Augustine grass is Andersons’ PGF complete fertilizer particularly if you like dry fertilizer. This fertilizer will give you a lawn that appears healthy and will put your neighbors to shame.

Features

  • The N-P-K ratio of this fertilizer of 16-4-8 is ideal for growing St. Augustine grass.
  • It contains 4% slow release nitrogen (methylene urea) that will continue to deliver nitrogen over an extended period of time as water slowly breaks down the nitrogen.
  • Each bag of fertilizer covers up to 5,000 square feet of lawn.
  • The fertilizer spreads well and evenly when used with a spreader. I advise you to water your lawn shortly after using the fertilizer to ensure that the small granules do not get carried away by the wind.
  • Andersons’ formula is unique in that it contains Humic Acid, which helps to make your soil the correct pH. Most soil is too basic, so the acid brings the pH down to the right levels. Correct soil pH levels are essential to proper uptake of nutrients from the fertilizer.

Pros

  • Perfect N-P-K ratio for St. Augustine grass
  • Slow release nitrogen
  • Contains humic acid for pH control

  • Small granules spread evenly

  • Great value

Cons

  • Not found at most retailers

Andersons PGF complete is our most recommended fertilizer for St. Augustine grass. It has all the features that you would want in a fertilizer – ideal NPK ratio, slow release, and pH control.

Simple Lawn Solutions’ liquid fertilizer is great for St. Augustine grass, particularly if you are looking for an organic option. Your lawn will be nice and healthy without the use of harsh chemicals with this fertilizer.

Features

  • This liquid fertilizer contains the ideal N-P-K ratio for St. Augustine grass (16-4-8)
  • The liquid fertilizer will cover a lawn that is roughly 3,500 square feet.
  • Simple Lawn Solutions sells this fertilizer in multiple different size capacities, which is perfect for people with larger lawns. They sell it from sizes of 32 ounces to 2.5 gallons.
  • The best feature of this fertilizer is that it uses organic feed grade ingredients without any harsh chemicals. This may be a consideration if you have young children or pets that frequently play out in the yard.
  • The company has over 25 years of experience and the fertilizer itself is made in the US.

Pros

  • Perfect N-P-K ratio for St. Augustine grass
  • Four Size Options Available
  • Manufacture in the US
  • Organic ingredients

Cons

  • No sustained release nitrogen

Simple Lawn Solutions liquid fertilizer is a great liquid fertilizer for St. Augustine grass. This fertilizer contains organic ingredients and has the ideal N-P-K ratio. It does not have slow release nitrogen, but I find that this matters less for St. Augustine grass compared to some other grass types.

Lawnstar’s liquid fertilizer is the fertilizer of choice for St. Augustine grass if you like using spray fertilizer. It has great value and will make your lawn grow in quickly and in a healthy manner.

Features

  • The fertilizer consists of an N-P-K ratio of 16-4-8, which is the exact N-P-K ratio that you want for St. Augustine grass.
  • It contains 6% urea triazone solution, which is a form of nitrogen that is slowly released over time. This allows your grass to stay green for longer.
  • Lawnstar has added natural seaweed extract into this fertilizer solution to maximize the amount of macronutrients that is able to be taken up by the root zone.
  • This is a concentrated solution which allows you to treat lawns up to 4,000 square feet.
  • As with many other liquid food fertilizers, the container fits a standard hose to make applying the liquid fertilizer much simpler.

Pros

  • Perfect N-P-K ratio for St. Augustine grass
  • Slow release nitrogen
  • 4,000 Square Foot Lawn Size Capacity
  • Optimized with seaweed extract
  • Great value

Cons

  • Not sold at most retailers

Your St. Augustine grass will grow strong and healthy with this fertilizer that has the perfect NPK ratio, slow release nitrogen, and the added bonus of having seaweed extract.

Scotts is the most well-known commercially available fertilizer that comes in multiple different packaging and nutrient ratios. In general, I find that they have so many different packages without clearly labelled N-P-K ratios that sometimes I find it hard to find what suits my exact needs. This fertilizer is decent for St. Augustine grass, but there are better options out there (note I would not use this on Bermuda grass as it is sensitive to the Mesotrione ingredient)

Features

  • This particular fertilizer contains Mesotrione, which prevents crabgrass and dandelion growth for up to 6 weeks.
  • The product is better at preventing new weed growth, rather than actually killing any existing weed
  • This fertilizer has a N-P-K ratio of 21-22-4, which is more phosphorus than is ideal for St. Augustine grass.

Pros

  • 5,000 Square Foot Fertilizer Capacity
  • Prevents the growth of new weed
  • Sold at many retailers

Cons

  • Less than ideal N-P-K ratio for St. Augustine grass
  • Expensive
  • Does not get rid of existing weed
  • Not Sold in the state of Florida

Scotts’ Turf Builder 2-in-1 is great if you are looking to grow St. Augustine grass while also preventing the growth of new weed. I think there are better options out there, but it is still a great fertilizer.

Pendelton Turf and Supply Liquid Fertilizer will help your St. Augustine Grass looking healthy in no time.

Features

  • It has an N-P-K ratio of 18-3-6, which is slightly more in nitrogen than the ideal, but still works well with St. Augustine grass

  • Pendleton’s fertilizer is a high concentration ratio that is supposed to be mixed at a ratio of 50:1

  • This high concentration product covers roughly 2.5 acres of lawn.

Pros

  • 2.5 acre capacity
  • Slow release nitrogen

  • High concentration product

Cons

  • Not sold at many retail stores

  • Expensive

Pendleton’s fertilizer will fit your grass needs, but unfortunately is not always found at all brick and mortar stores. I recommend that you give it a try i f you want a high concentration fertilizer that can cover a lot of lawn area.

Fertilizer for st augustine

Raising Healthy St. Augustine Grass

St. Augustine grass (stenataphrum secundatum) is a robust grass that looks beautiful when it is well tended to and fertilized well, which is why I think it’s important to take a look at the best fertilizers for St. Augustine grass. When grown properly, it creates a dense carpet of coarse grass blades that have a blue-green color and can grow well even in shaded areas. To properly grow and maintain your St. Augustine lawn, the right fertilizer is necessary.

N-P-K Ratio

As you may know, every plant has different ideal NPK ratios. The ideal fertilizer for each type of grass or plant is dependent not only on the quality of the fertilizer itself, but also dependent on its specific NPK ratio. For St. Augustine grass, the ideal ratio is 4-1-2 so a fertilizer with a 16-4-8 or 20-5-10 ratio would be ideal. Remember, this ratio is important as too much nutrient is actually harmful for the grass and furthermore can make the ground a breeding ground for pests. Make sure to apply the correct amount of fertilizer depending on the NPK ratio.

Do Not Over Feed or Water Your Lawn

Many people may not know this, but overfeeding or over watering your lawn can create as many issues as underfeeding it. This is slightly less of a problem in dry and hot environments where there is little water left in the soil after a sunny day, but just realize that if your soil is constantly moist it can cause your grass’s roots to rot. Too much fertilizer can also create a breeding ground for pests and also lead to leaf burn.

Fertilizer for st augustine

Fertilizer Application Frequency

St. Augustine grass should be sprayed or spread with fertilizer about once every 2 months during the warm seasons. That means that if you live in the north, you should be fertilizing your lawn from May through September a total of three times. If you live in the south, such as Florida, you should be fertilizing from April to October or even November. If you are using sustain release fertilizers, then you can space your frequency of fertilizing to every 3 months

Bottom Line

Again, I recommend buying Anderson’s Complete Fertilizer . Don’t make the mistake of buy any average fertilizer at your local gardening store. Many of them will simply not produce the same results. You cannot go wrong with any of the fertilizers above. 

Happy Planting!

About the author: Carley Miller is a horticultural expert at TheGreenPinky. She previously owned a landscaping business for 25 years and worked at a local garden center for 10 years. Read More