Best Fertilizer For St. Augustine Grass (2025 Update)

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If you’re looking for a lush and healthy lawn, you need to invest in the right fertilizer. However, when it comes to nourishing St. Augustine grass, not all fertilizers are created equal. Before making your purchase, there are a few factors to consider to ensure you choose the best fertilizer for your St. Augustine grass.

Firstly, it's essential to understand the nutrient requirements of St. Augustine grass. This type of grass requires a balanced mix of nitrogen, phosphorus, and potassium, commonly known as NPK. A good fertilizer for St. Augustine grass should have a high nitrogen content to encourage healthy growth and a significant amount of phosphorus to promote root development.

Another thing to consider is the type of fertilizer you want to use. Do you want to use a slow-release fertilizer that gradually feeds your lawn over a more extended period, or do you prefer a quick-release fertilizer that delivers results a lot quicker?

Are you tired of dealing with weeds and pests? Well, look for a fertilizer with added herbicides or insecticides. These products help to eliminate weeds and pests while nourishing your grass, saving you time and money.

Investing in the best fertilizer for your St. Augustine grass is crucial if you want a beautiful, healthy lawn. Consider the nutrient requirements of your grass, the type of fertilizer you need, and any unique requirements you may have, such as weed control. So, if you're looking to maintain an enviable lawn, grab the best fertilizer for St. Augustine grass today!

10 Best Fertilizer For St. Augustine Grass

# Product Image Product Name Product Notes Check Price
1
The product is ideal for providing summer and fall nutrients to any grass type, improving turf hardiness and root vigor.
2
This liquid fertilizer is ideal for providing essential nutrients and micronutrients to promote healthy growth in plants.
3
The product is ideal for fertilizing lawns at the beginning of the growing season to promote healthy and vigorous growth.
4
The product is ideal for fertilizing lawns of up to 5000 square feet.
5
This product is ideal for fertilizing newly planted or sodded grass, covering up to 5,000 square feet.
6
This product is ideal for strengthening and protecting all types of lawns against heat and drought for up to 3 months.
7
Ideal for building thick, green lawns with quick deep greening results, covering up to 10,000 sq. ft.
8
The product is ideal for fertilizing and providing nutrients to lawns and grass, using natural microorganisms for healthier growth.
9
The product is ideal for repairing damaged St. Augustine lawns without the need for grass seeds, covering up to 85 sq. ft.
10
This fertilizer is ideal for St. Augustine grass as it contains nutrients specific to its needs.
The product is ideal for providing summer and fall nutrients to any grass type, improving turf hardiness and root vigor.
This liquid fertilizer is ideal for providing essential nutrients and micronutrients to promote healthy growth in plants.
The product is ideal for fertilizing lawns at the beginning of the growing season to promote healthy and vigorous growth.
The product is ideal for fertilizing lawns of up to 5000 square feet.
This product is ideal for fertilizing newly planted or sodded grass, covering up to 5,000 square feet.
This product is ideal for strengthening and protecting all types of lawns against heat and drought for up to 3 months.
Ideal for building thick, green lawns with quick deep greening results, covering up to 10,000 sq. ft.
The product is ideal for fertilizing and providing nutrients to lawns and grass, using natural microorganisms for healthier growth.
The product is ideal for repairing damaged St. Augustine lawns without the need for grass seeds, covering up to 85 sq. ft.
This fertilizer is ideal for St. Augustine grass as it contains nutrients specific to its needs.

1. Nutrient-Rich Lawn Food Spray For All Seasons

The High Phosphorus, High Potassium Lawn Food is an ideal fertilizer for individuals looking to address Phosphorus and Potassium deficiencies in their lawn or maintain its overall health. This top-quality liquid lawn nutrient is formulated with high-grade feed ingredients that provide your lawn with the necessary nutrients for robust root development, vigor, and strength.

Designed to be user-friendly, this lawn food can be easily applied on all grass types, including Bermuda, St. Augustine, Zoysia, Buffalo, Centipede, Palmetto, and Bluegrass Lawns. The 3-18-18 Lawn Fertilizer Food comes with a ready-to-use hose end sprayer that applies the perfect ratio of product for lawn applications. When using the attached sprayer, it covers up to 3,200 square feet, making it an ideal choice for large lawns.

This fertilizer is an excellent starter fertilizer that provides essential Phosphorus to promote plant development, which is highly recommended during lawn establishment. It contains 3% Nitrogen, which is a low Nitrogen formula that encourages growth for the development of a dense, attractive lawn.

With 18% Phosphorus, this lawn food encourages root development, which is essential for turf establishment. While the effects of Phosphorus on turf are usually more subtle and not as visible, they are still essential. Additionally, this fertilizer contains 18% Potassium, which enhances the plant's endurance to stress if a deficiency is present. The application of Potassium will generally not show a visible response.

Produced in the United States of America, this lawn fertilizer is manufactured by a family-owned business with over 25 years of experience in the Commercial Professional Turf and Agriculture Industry. This assures you of its quality and reliability.

2. 18-3-6 Liquid Fertilizer (50% Srn & Micronutrients) (2.5 Gallons)

This all-purpose fertilizer is an excellent choice for gardeners looking for a product that delivers essential nutrients to plants throughout the growing season. It contains 50% slow-release nitrogen (SRN), which means that it provides both readily available nutrients and extended, long-lasting nitrogen.

One of the added benefits of this fertilizer is that it contains micro-nutrients that aid in plant growth, aesthetic appeal, and overall plant health.

When using this fertilizer on ornamentals, it is recommended to mix 1-2 oz of fertilizer to 1 gallon of water and generously water the plants. It is best to fertilize once every two weeks. For turf, it is recommended to use 3 oz. of fertilizer for every 1000 sq. ft and mix it in a spray tank at a ratio of 1-3 oz per gallon of water. Fertilizing once every 2-4 weeks is ideal.

The guaranteed analysis for this fertilizer is 18% Nitrogen, 3% Available Phosphoric Acid, 6% Soluble Potash, .05% Copper, .1% Iron, .05% Manganese, and .05% Zinc.

3. Pennington Ultragreen Starter Lawn Fertilizer, 14 Lbs, Covers 5000 Sq Ft

Introducing a highly effective starter fertilizer that is specially designed to aid in the establishment of new lawns with seed or sod, as well as overseeding existing lawns. This fertilizer is a must-have for anyone looking to achieve a thick, full lawn with strong, deep roots and fast establishment.

This powerful fertilizer is capable of helping all types of grass seed, sod, and plugs establish roots quickly, leading to a quick greening effect that will have your lawn looking lush and healthy in no time. With extended feeding capabilities, this fertilizer provides essential nutrients to your lawn for up to 3 months, ensuring that your lawn remains healthy and vibrant throughout the growing season.

By providing your lawn with the necessary nutrients to achieve a deep root system, this fertilizer helps your grass to withstand drought and other harsh environmental conditions. This means that your lawn will remain healthy and green even during periods of hot, dry weather.

4. Pennington 100536576 Ultragreen Lawn Fertilizer, 14 Lbs, Covers 5000 Sq Ft

This all-purpose fertilizer is ideal for use on all types of lawns. Its unique formula strengthens the grass against heat and drought, ensuring that your lawn stays lush and green even in the hottest and driest of summers. With this fertilizer, you can achieve a thick, deep green lawn that will be the envy of your neighborhood.

One of the standout features of this fertilizer is its quick greening capabilities. You can expect to see results in just a few days after application. This makes it an excellent choice for those who want to spruce up their lawn before a special event or gathering.

In addition to its quick greening abilities, this fertilizer provides extended feeding for up to 3 months. This means that your lawn will continue to receive the nutrients it needs to thrive, long after the initial application. This feature is especially beneficial for those who want to maintain a healthy lawn throughout the year without having to constantly apply fertilizer.

5. New Grass Boost – Scotts Starter Food

This lawn fertilizer is a great option for those looking to improve the health and appearance of their grass. With a unique formula that promotes thicker and quicker growth, this fertilizer will have your lawn looking lush and healthy in no time.

Compared to unfed grass, this product has been shown to increase grass thickness by an impressive 70% and speed up growth by 35%. It is also effective in improving seeding results and is suitable for use with sod and grass plugs.

With a balanced 24-25-4 fertilizer ratio, this product provides all the necessary nutrients for developing lawns, ensuring that your grass is getting the best possible start. It is safe for use with any grass type, whether you are planting new grass, starting a new lawn, or reseeding an existing one.

Each package of this fertilizer covers an impressive 5,000 sq. ft, making it a cost-effective option for those with larger lawns. So if you're looking to achieve a thicker, healthier lawn, this lawn fertilizer is the perfect choice.

6. 5k Coverage Amaze Lawn Strengthener

Amaze! Lawn Food is an exceptional fertilizer that caters to all grass types, providing up to 3 months of nourishment. This fertilizer also helps establish and reinforce lawns to shield against intense heat and drought.

Amaze! Lawn Food is versatile and can be used on lawns with a variety of grass types, such as Bahia, Bentgrass, Bermuda, Centipede, Fescue, Kentucky Bluegrass, Ryegrass, St. Augustine, and Zoysia. To achieve the best results, apply Amaze! Lawn Food to your grass when it is actively growing.

Each bag of Amaze! Lawn Food is designed to cover a generous area of 5,000 sq. ft of lawn. This feature makes it a great value for those who have larger lawn areas to treat.

7. Green Max Plus: 3-Day Deep Greening

Looking for an effective way to green up your lawn quickly? Look no further than this powerful lawn feed from Scotts. In just three days, this 2-in-1 formula will have your grass looking lush and vibrant, thanks to its dual-action feeding and supplementing with iron. And best of all, unlike other fertilizers, it won't leave any unsightly stains on your lawn when used as directed.

This feed is suitable for use on any type of grass, and can be applied in the spring, summer, or fall for optimal results. It's also recommended as part of the Scotts Lawn Care Plan, which means you can trust that it's been thoroughly tested and proven to work. And with no wait time required after application, you can get back to enjoying your lawn right away.

So why wait? Give your lawn the deep greening it deserves with this powerful lawn feed from Scotts.

8. Total Biome Organic Lawn Nutrient Spray

This fertilizer offers a range of benefits for your lawn, thanks to the micro-organisms present within it. By promoting microbial activity and nutrient cycling, it helps to improve soil health, creating a more balanced and fertile environment for your grass to thrive in.

One of the key ways in which the micro-organisms in this fertilizer work is by aiding in the breakdown of organic matter within the soil. This includes dead plant material and thatch, which can release valuable nutrients as they decompose. By making these nutrients available to the grass roots, the fertilizer helps to boost growth and promote a healthy lawn.

In addition to this, the micro-organisms within the fertilizer also play a vital role in nutrient cycling. By converting complex organic compounds into simpler forms that grass can easily absorb, they help to maximize the availability and utilization of nutrients, further enhancing grass growth and health.

The activities of the micro-organisms also help to improve soil structure, creating aggregates and improving soil porosity. This makes it easier for water to infiltrate the soil, as well as for roots to penetrate and for air to circulate. This, in turn, leads to even healthier grass growth.

One of the key benefits of this fertilizer is its reduced environmental impact. Made entirely from micro-organisms, it eliminates the need for synthetic chemicals and provides a more sustainable and eco-friendly approach to lawn care. As a USDA Certified Biobased Product, you can feel confident that you're making a positive choice for the environment.

9. St. Augustine Lawn Repair – Ez & Effective!

Scotts EZ Patch Lawn Repair for St. Augustine Lawns is the perfect solution for those looking to repair their lawns in a quick and efficient manner. This combination mulch and fertilizer is designed to repair St. Augustinegrass 60% faster than untreated lawns, with visible results as soon as 15 days after application (results may vary).

The mulch component of this product is specially designed to absorb up to 6x its weight in water, creating a moist and protective layer around the seed. This helps to promote healthy growth and establishment of St. Augustinegrass, ensuring a lush and beautiful lawn.

The fertilizer component of this product features an exclusive controlled release technology that feeds the grass over time, ensuring that it receives all the necessary nutrients to thrive. This technology helps to promote healthy growth and establishment, resulting in a lawn that is both beautiful and healthy.

Scotts EZ Patch Lawn Repair for St. Augustine Lawns comes ready-to-use, with enough product to cover up to 85 sq. ft. of lawn. This makes it a quick and easy solution for those looking to repair their lawns without having to spend hours on end doing so.

It is important to note that Scotts EZ Patch Lawn Repair for St. Augustine Lawns does not contain grass seed. However, it is still an excellent choice for those looking to repair their lawns quickly and efficiently.

10. Seedranch St. Augustine Lawn 24-2-11 Fertilizer – 50 Lbs.

Introducing a top-quality lawn fertilizer that is specially formulated to give your St. Augustine grass the nutrients it needs to thrive and flourish. This fertilizer boasts an impressive 6% iron content, which is essential for maintaining a lush, green lawn. With a coverage area of 12,000 square feet, this fertilizer is perfect for larger lawns or for those who want to stock up and have plenty on hand for future use.

The high iron content in this fertilizer is one of its key features, as it provides the perfect balance of nutrients that your St. Augustine grass needs to grow strong and healthy. Iron is essential for promoting deep green color and robust growth, and this fertilizer delivers just the right amount to produce stunning results.

With a coverage area of 12,000 square feet, this fertilizer is perfect for those with large lawns or those who want to ensure they have enough product for multiple applications. This high-quality fertilizer is easy to apply and will provide your St. Augustine grass with the nutrients it needs to look its best.

Best Fertilizer For St. Augustine Grass FAQs

Are there any organic fertilizers that are effective for St. Augustine grass?

Yes, there are several organic fertilizers that are effective for St. Augustine grass. One popular option is fish emulsion, which is made from fish waste and is high in nitrogen, phosphorus, and potassium. Another effective organic fertilizer is compost, which provides a slow-release source of nutrients and helps improve soil structure. Other options include bone meal, which is high in phosphorus, and blood meal, which is high in nitrogen. It's important to note that organic fertilizers may not provide immediate results like synthetic fertilizers, but they are better for the long-term health of your lawn and the environment. Additionally, it's important to follow the manufacturer's instructions for application rates and timing to avoid over-fertilization, which can damage your lawn.

Are there any specific brands of fertilizer that are recommended for St. Augustine grass?

Yes, there are specific brands of fertilizer that are recommended for St. Augustine grass. St. Augustine grass is a warm-season grass that requires a specific balance of nutrients to thrive. A good fertilizer for St. Augustine grass should have a higher nitrogen content, with a balance of phosphorus and potassium. It is recommended to use a slow-release fertilizer that will feed the grass over a longer period of time.

One popular brand of fertilizer for St. Augustine grass is Scotts Turf Builder Southern Triple Action. This fertilizer is specifically formulated for southern lawns and contains a blend of nutrients that are ideal for St. Augustine grass. Another good option is Milorganite Organic Nitrogen Fertilizer. This fertilizer is made from recycled organic materials and is a slow-release formula that provides a consistent source of nutrients to the grass.

It is important to follow the instructions on the fertilizer packaging and apply the fertilizer at the appropriate time of year. Over-fertilizing can damage the grass, so it is important to use the recommended amount. With proper fertilization, St. Augustine grass can thrive and provide a lush, green lawn.

Can too much fertilizer harm St. Augustine grass?

Yes, too much fertilizer can harm St. Augustine grass. While fertilizing your lawn can provide essential nutrients to promote healthy growth, over-fertilization can lead to damage and stress on the grass. St. Augustine grass is especially sensitive to high levels of nitrogen, which can cause excessive growth and make the grass susceptible to disease and pests. Additionally, over-fertilization can result in nutrient runoff, which can harm local waterways and ecosystems. It's important to follow recommended fertilization guidelines and avoid applying fertilizer during hot, dry weather or before heavy rain. Testing your soil can also help ensure that you're providing your lawn with the necessary nutrients without overdoing it. If you're unsure about how much fertilizer to apply or when to apply it, consult with a lawn care professional.

How often should St. Augustine grass be fertilized?

St. Augustine grass is a popular warm-season grass that is commonly found in the southern United States. Fertilizing this type of grass is important to maintain its health and appearance. The frequency of fertilization depends on several factors including the type of fertilizer used, the climate, and the age of the grass.

In general, St. Augustine grass should be fertilized at least once every six to eight weeks during the growing season, which is typically from late spring to early fall. However, this may vary depending on your location and the specific needs of your lawn. It is important to follow the manufacturer's instructions for the specific type of fertilizer you are using and to avoid over-fertilizing, which can lead to environmental issues and damage to the grass.

It is also recommended to perform a soil test prior to fertilization to determine the specific nutrient needs of your lawn. This can help you choose the appropriate fertilizer and ensure that your lawn is receiving the proper nutrients for optimal growth and health.

Is it better to use liquid or granular fertilizer for St. Augustine grass?

The choice between liquid or granular fertilizer for St. Augustine grass depends on several factors. Liquid fertilizers are absorbed faster by the grass, and they are easier to apply evenly. They also allow for more precise control of the nutrients being applied, making it easier to tailor the fertilizer to the needs of the grass. Granular fertilizers, on the other hand, release nutrients more slowly and evenly over time, providing a longer-lasting effect. They are also easier to store and transport than liquid fertilizers.

Ultimately, the choice between liquid or granular fertilizer depends on personal preference and the specific needs of the St. Augustine grass. If the grass needs a quick boost of nutrients, a liquid fertilizer may be the best option. If the grass needs a longer-lasting effect, a granular fertilizer may be more appropriate. It is also important to consider the cost, ease of application, and environmental impact of each type of fertilizer before making a decision.

Should a slow-release or quick-release fertilizer be used for St. Augustine grass?

When it comes to fertilizing St. Augustine grass, the choice between slow-release and quick-release fertilizer depends on the specific needs of your lawn. Slow-release fertilizers are designed to release nutrients over an extended period, typically two to three months. This type of fertilizer is ideal for St. Augustine grass because it provides a steady supply of nutrients throughout the growing season, promoting even growth and reducing the risk of nutrient burn.

On the other hand, quick-release fertilizers release nutrients rapidly, typically over a period of two to four weeks. This type of fertilizer is best used when your St. Augustine grass requires a quick boost of nutrients, such as after a long period of drought or stress.

It's important to note that overuse of any type of fertilizer can harm your St. Augustine grass, so it's important to follow the manufacturer's instructions carefully. Additionally, it's recommended that you conduct a soil test to determine your lawn's specific nutrient needs and adjust your fertilizer application accordingly. Ultimately, the decision between slow-release and quick-release fertilizer should be based on the specific needs of your St. Augustine grass.

What is the best type of fertilizer for St. Augustine grass?

St. Augustine grass is a warm-season grass that requires specific nutrients to thrive. The best type of fertilizer for St. Augustine grass is one that contains nitrogen, phosphorus, and potassium in a ratio of 3:1:2. Nitrogen is crucial for promoting leaf growth and a lush green color, while phosphorus is essential for root development and overall plant health. Potassium helps the grass withstand stress and disease.

When choosing a fertilizer for St. Augustine grass, it is important to select one that is slow-release to prevent excessive growth and the need for frequent mowing. Additionally, it is recommended to apply fertilizer during the growing season, typically from late spring to early fall, to ensure maximum absorption by the grass.

It is important to follow the manufacturer's instructions when applying fertilizer to ensure the correct amount is used and to prevent damage to the grass. By using a high-quality fertilizer with the correct balance of nutrients, St. Augustine grass can grow healthy and strong, resulting in a beautiful, lush lawn.

What is the ideal N-P-K ratio for St. Augustine grass fertilizer?

St. Augustine grass is a popular warm-season grass that is widely cultivated in the southern United States. When it comes to fertilizing St. Augustine grass, the ideal N-P-K ratio depends on the specific needs of your lawn. In general, St. Augustine grass requires a fertilizer with a balanced N-P-K ratio of 3:1:2 or 4:1:2.

The first number in the N-P-K ratio stands for nitrogen, which is essential for promoting healthy green growth in St. Augustine grass. The second number stands for phosphorus, which helps to promote root growth and development. The third number stands for potassium, which is important for overall plant health and stress tolerance.

It's important to note that St. Augustine grass has relatively low phosphorus requirements, so it's best to choose a fertilizer with a lower phosphorus content unless a soil test indicates otherwise. Additionally, it's important to follow the manufacturer's instructions for application rates and timing to avoid over-fertilizing and potential damage to your lawn.

What nutrients should be included in a fertilizer for St. Augustine grass?

St. Augustine grass is a warm-season grass that requires specific nutrients for optimal growth. When selecting a fertilizer, it is important to choose one that provides the necessary nutrients in the correct proportions. Nitrogen, phosphorus, and potassium are the three primary macronutrients that should be included in a fertilizer for St. Augustine grass. Nitrogen is important for promoting leaf growth, while phosphorus aids in root development and potassium helps the grass resist disease and drought.

In addition to these macronutrients, St. Augustine grass also requires certain micronutrients, such as iron and magnesium, to maintain a healthy appearance. These micronutrients can be included in a fertilizer or applied separately as needed.

It is important to follow recommended application rates and timing for fertilizing St. Augustine grass, as over-fertilization can lead to excessive growth and potential damage to the grass. Regular soil testing can also help determine any nutrient deficiencies and guide fertilizer selection.

What time of year is best to fertilize St. Augustine grass?

The best time to fertilize St. Augustine grass is during its growing season, which is typically in the late spring or early summer. This is when the grass is actively growing and can best utilize the nutrients in the fertilizer. It's important to note that over-fertilization can damage the grass, so it's best to follow the recommended guidelines for the amount and frequency of application. It's also important to choose a fertilizer specifically formulated for St. Augustine grass, as different grass types have different nutrient needs. Before fertilizing, it's a good idea to test the soil to determine what nutrients are lacking and adjust the fertilizer accordingly. Overall, proper fertilization can help maintain a healthy and vibrant St. Augustine lawn.

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