Best Fertilizer for St. Augustine Grass to Promote Lush Lawns

Every homeowner wish to have a green, well-maintained healthy, lush lawn. You need to apply a fertilizer with high nitrogen content and other ingredients like iron for quick greening to achieve this. Furthermore, you can achieve this by applying the best fertilizer for St. Augustine grass growing on your lawn.

Not all fertilizers are manufactured equally. The difference between the best fertilizers out there and an average one happens to be drastic. It can mean the difference between a luscious green lawn and a lifeless lawn. Therefore giving your St. Augustine grass the right nutrients is important for the well-being of your lawn.

The market is flooded with all types of fertilizers, making it a bit challenging to identify the best one for your St. Augustine grass. You want a fertilizer that delivers the right nutrients to your grass’s root zone. Worry less because we have done the research and compiled the best fertilizers for St. Augustine grass. So drop all your frustration and guesswork and get ready to learn more.

1. Simple Lawn Solutions -Lawn Food Quality Liquid Fertilizer

Advanced 16-4-8 Balanced NPK – Lawn Food Quality Liquid Fertilizer – Spring…
  • Complete NPK Lawn Food: 16-4-8 is the perfect blend of key macronutrients….
  • Contains High Quality Feed Grade Ingredients: Nourish your lawn with pure…
  • Easy To Use: Designed to be easily applied. This complete Nitrogen,…
  • All Grass types: Including Bermuda, St. Augustine, Zoysia, Buffalo,…
  • Produced In The United States: 16-4-8 is manufactured in the United States…

You can bet on the Simple Lawn Solutions Liquid Fertilizer for the best fertilizer for St. Augustine grass or any other type of grass. This liquid fertilizer formula contains natural ingredients, including fish and seaweed, to feed your St. Augustine lawn. It comes with an NPK ratio of 16-4-8, which is great for a new lawn or a well-established St. Augustine grass. This liquid fertilizer’s claim to fame is feeding your St. Augustine lawn an optimum balance of nutrients without any tough chemicals.

The liquid fertilizer comes with a ready-to-use spray nozzle, allowing you to spray your grass by hand with equal, consistent passes. It comes in a 32 oz bottle, which can cover up to 3200 square feet of lawn. For better results, we recommend you spray your lawn as often as monthly.

One of the great benefits of this liquid fertilizer is that it is ready to use, even if you don’t have elaborate spraying equipment at home. The results show quickly; however, since this is a fast-acting liquid fertilizer solution, it won’t last all season long. In addition, the nozzle spray on the bottle is designed to hook up with any regular hose; therefore, you can spray your St. Augustine grass directly from the package while it self-dilutes. Last but not least, we recommend you read the instructions carefully and ensure the hose is properly connected before spraying your lawn.


  • Since it is a fast-acting liquid solution, it offers quick results
  • Ready to use liquid fertilizer with a nozzle spray
  • Contains natural ingredients
  • Ideal for all type of grass lawn


  • Doesn’t last long on the lawn
  • Smells awful

2. Simple Lawn Solutions Quality Liquid Fertilizer- Extreme Grass Growth Lawn Booster

Extreme Grass Growth Lawn Booster- Liquid Spray Concentrated Starter…
  • Increase Vertical & Lateral Growth: Advanced Humic Acid Formula, Also Great…
  • Nitrogen & Phosphorus Fertilizer: Commercial Lawn Growth Boosting Formula…
  • Use For Nutrient Deficiency, New Lawns and Lawn Repair: Concentrated…
  • All Grass types: Including Bermuda, St. Augustine, Zoysia, Buffalo,…
  • Produced In The United States: Growth Booster is manufactured in the United…

For the best fertilizer for St. Augustine grass that boosts the growth of this grass and all other types of grass, count on the Simple Lawn Solutions Growth Lawn Booster. This fertilizer increases the vertical and lateral growth of your St. Augustine grass. It comes in an easy-to-use container for quick and easy application. All you need to do is attach it to your garden hose, and you are ready to apply. Besides, it is pet and kid-friendly, and safe to use anywhere.

These Simple Lawn Solutions Grass Growth Lawn Booster has a 6-19-0 NPK ratio which delivers phosphorous and nitrogen to your lawn and fulvic and humic acid. The formula in this Simple Lawn Solutions Liquid Fertilizer is made using high-quality natural and organic food-grade ingredients that boost the growth of your lawn the growth of St. Augustine grass. Besides, these are the grass types that flourish when applied this fertilizer; St. Augustine, Bermuda, Buffalo, Centipede, Zoysia, Fescue, Florida Palmetto, Bahia, Ryegrass, and Kentucky Bluegrass.


  • Ready to use liquid fertilizer with a nozzle spray
  • Contains natural ingredients
  • Ideal for all type of grass lawn
  • Boost vertical and lateral growth


  • Smells awful
  • If not applied properly, it may kill the grass.

3. Scotts Turf Builder (5,000 Sq Ft.) Southern Lawn Food

Scotts Turf Builder Southern Lawn Food, 5,000 sq. ft.
  • Specially formulated for Southern lawns and includes Scotts All-in-One…
  • Feeds to protect against heat and drought
  • Improves lawn’s ability to absorb water and nutrients versus an unfed…
  • OK to re-enter lawn immediately after product is applied
  • Apply to any grass type

If you are planting a new lawn, this Scotts Turf Builder Fertilizer is the perfect starter food to start your lawn off in the best way possible. This lawn food is designed to grow your lawn greener, thicker, and more durable against drought by enhancing your lawn’s ability to absorb moisture. In addition, it promotes rapid growth grass, which can grow up to 35% faster than grass with no treatment. Furthermore, it is a great choice for all types of turf, including St. Augustine that is looking pale and patchy.

This turf builder by Scotts has an NPK ratio of 32-0-4, meaning it is very rich in nitrogen, a vital nutrient for a lusher, greener lawn. A thicker lawn is a great defense against pests and aid in crowding out weeds. As a granular fertilizer, Scott’s turf builder shows fast results and contains slow-release particles for a prolonged solution than many of the liquid fertilizers. Moreover, the very fine texture in this slow-release fertilizer makes it quick to absorb; ensure you use a standard lawn spreader to apply according to the instructions on the package.

Due to the high percentage of nitrogen, we recommend avoiding applying in excessively hot weather. Instead, apply anytime throughout the growing seasons, once every 6 to 8 weeks. Also, sweep any excess fertilizer that may have fallen onto patios or sidewalks back into the lawn.


  • Ideal for new grass
  • 5,000 Square Feet of lawn
  • Prevents the growth of new weed
  • Enhances lawn’s ability to absorb water
  • You can use it on all grass types
  • Both fast-acting and slow-release


  • A bit Expensive
  • Not Sold in the state of Florida

4. Super Juice All in One Soluble Supplement Lawn Fertilizer for St. Augustine Grass

Super Juice All in One Soluble Supplement Lawn Fertilizer
  • New Improved Formula with 4% Iron !
  • Super Juice Lawn Fertilizer is the first ALL-IN-ONE, complete, balanced,…
  • Super Juice can be applied in a 14-2-4 ratio for a full acre of lawn, or…
  • One bag of Super Juice will treat ONE ACRE* or 43,560 sq ft of lawn at the…
  • Cannot be shipped to South Dakota and California

For the best fertilizer for St. Augustine grass that is all-in-one, you found one of the Super Juice All-in-one Soluble Supplement Lawn Fertilizers. This lawn fertilizer has a 14-2-4 NPK formulation. It is derived from Ammonium Phosphate, Urea, Magnesium Sulfate, Humic acid, Iron, Manganese, and other minerals. Since St. Augustine requires fertilizer with higher nitrogen content than Phosphorus and Potassium, the Super Juice All-in-one Soluble Lawn Fertilizer has these in consideration.

This fertilizer for St. Augustine grass is a concentrated soluble granule fertilizer for liquid application during cool and warm-season months. It comes in a 6.17 kgs or 13.6 pounds bag. With one bag of this fertilizer, you can cover 43,560 square feet. Besides, it comes in a foil-lined resealable bag; therefore, you can store the unused portion for the next application without worrying about contamination or waste.

Furthermore, this fertilizer is designed as a supplement. As a supplement, it can produce fast results during the spring seasons. For a healthy lawn, you can use it as a primary like home lawn and golf courses.


  • Produces fast results during the spring seasons
  • Effective grass fertilizer
  • All-in-one fertilizer
  • Pet friendly


  • Hard to mix, and it clogs sprayers.

5. Milorganite 32 lb. Slow-Release Nitrogen Fertilizer

For organic and non-synthetic fertilizer, we recommend the Milorganite Slow-Release Nitrogen Fertilizer. This fertilizer is rich in nitrogen, making it perfect for St.Augustine grass. However, the NPK ratio is 6-4-0, meaning it doesn’t contain Potassium; therefore, you should not apply it in times or areas of drought. Also, it means the concentration of nitrogen is quite low and therefore has no chance of burning your St. Augustine lawn.

When you apply to your St. Augustine lawn, you should expect a darker green lawn that is less thirsty and easy to mow; however, because it is slow release type of fertilizer, the results may take some time. Slow-release is generally more economical and better for the lawn soil.

Furthermore, when applying this granular fertilizer, you will need a lawn spreader. Check the application directions on the bag to know what your spreader should be at when laying down the fertilizer. If there no rain projections, you may need to water the lawn a day or so after putting it down. Also, apply just once in summer, fall, and spring, respectively.

This organic fertilizer for St. Augustine grass has a smell; however, it dissipates quickly. When buying an organic fertilizer like this is a good sign. You can also use it to repel deer and rabbits.


  • Used by professionals
  • Organic, non-synthetic fertilizer
  • Slow-release type of fertilizer
  • You can use it to repel deer and rabbits


  • Smells awful

Factors to Consider When Buying the Best Fertilizer for St. Augustine Grass

1. Nutrient contents

Augustine grass, like many other plants, requires nutrients to survive. Therefore when shopping for the best fertilizers for St. Augustine grass, consider the type of nutrients in them. Check whether there are the following nutrients;

  • Phosphorus- Strengthens the grass and helps roots develop.
  • Nitrogen- Helps the grass leaves grow and makes them greener. Lawn fertilizers have much higher nitrogen content; therefore, it is not much of a concern.
  • Potassium- This nutrient enhances the immune for the grass. It is handy in fighting off disease and endure extreme temperatures.

2. Slow-release vs. Quick release

When buying St. Augustine grass fertilizer, you will realize two categories; quick release and slow release. Unfortunately, fast-acting doesn’t necessarily mean long-lasting. Quick-release or liquid fertilizers enhance deep and fast greening and growth; however, they will require several applications throughout the growing season.

Slow-release fertilizers are for those wanting to save their effort and time. With an application as little as biannually, it means getting the job done, and you sit back enjoying almost the whole growing season of beautiful turf stress-free withing spraying again and again. Furthermore, these fertilizers have less probability of burning your grass lawn, even when there are extreme temperatures.

3. Organic vs. non-organic

When shopping for the best lawn fertilizer, consider whether you want organic or non-organic one. Organic fertilizers are made of natural materials such as crab meal, manure, and cottonseed meal. They can be plant-based, animal-based, or a combination of both. Conversely, non-organic also known as synthetic fertilizers, are artificial in labs.

Organic fertilizers usually work with the soil to break nutrients down. They don’t add acid or salt to the soil and promote healthy microbial activity. However, organic fertilizers have an odor and are more costly but have no drawback. Conversely, non-organic fertilizers need to be used carefully because of the higher salt content. They can offer your grass a quick boost, but they can too dismay the balance in the soil and trickle into your water supplies.

4. NPK ratios

NPK ratios are another consideration that you shouldn’t forego. The NPK ratio is an abbreviation for Nitrogen (N), Phosphorus (P), and Potassium (K). For instance, a bag indicated as 14-6-4 means that this fertilizer contains 14%Nitrogen, 6% Phosphorus, and 4% Potassium. The remaining 76% is added materials that make the fertilizer easier to spread. Moreover, each nutrient serves a different purpose.

Most granular fertilizers will have an NPK composition of high-low-medium. This composition is shown by the three numbers on the bag of fertilizer. If the fertilizer is soluble in water, the ratio of nitrogen is usually much higher to indicate quicker results and account for runoff.

5. Liquid vs. pellet

When shopping for the best fertilizer for St. Augustine grass, you will realize that the fertilizer comes in either liquid or pellet form. It will, however, depend on your personal preference when making the buying decision. Liquid fertilizers, also referred to as soluble fertilizers, are sprayed over the grass by attaching the sprayer and bottle to your garden hose. They act as lawn food for leave and root growth. Conversely, pellets, also known as granular fertilizers, are delivered by a spreader and triggered by being exposed to water. There is also another option for a subset of granular fertilizers referred to as slow release. They usually break down over weeks to prolong the effects of the fertilizers.

6. Soil deficiencies

Before buying the lawn fertilizers, it is important to consider what the lawn soil is lacking. Although a soil test in a lab is costly, it will let you know your soil’s pH balance and nutrient content. The lab technicians will tell you how much fertilizer you need.

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