When you decide to plant St Augustine grass it implies a certain level of commitment to take care of it too. This commitment starts with selecting the best Fertilizer for St Augustine Grass. It is not optional but essential.This type of grass has to cope with climate changes, dryness of the soil, pest, and activities that weaken it. As there are variations of this grass as well as different problems that may vary according to the location, there are several types of fertilizers. So, these are some of the best options to apply to your lawn.

Top 5 Fertilizer For St.Augustine Grass

Our Best Pick

Budget Friendly

Scotts Turf Builder Starter Food for New Grass Plus Weed Preventer

Scotts Turf Builder Starter Food for New Grass Plus Weed Preventer
  • Used up to 10,000 sq. ft.
  • Great work for sod and grass plugs
  • Also works on clay soils 
  • Prevents dandelions up to 6 weeks

Better Pick

Scotts Turf Builder Southern Triple Action

Scotts Turf Builder Southern Triple Action
  • Apply it on all variants of St. Augustine grass, including Floratam
  • The triple-action of killing, preventing and feeding
  • It is more effective to resists heat and droughts.
Scotts 30158 Turf Builder Thick'R Lawn Sun and Shade
This is the best version of Scotts fertilizer St. Augustine grass and is aimed to guarantee that your lawn continues to be a source of joy during Spring and Summer Times. St. Augustine grass shows its best look during those seasons. Then, during the Fall it rests and during the Winter it resists. And these 2 last seasons are the perfect time to feed your grass to make sure it is ready for better times.

Dual Action

What this fertilizer does is to leverage St. Augustine grass´ rest to feed and nurture its roots until making them strong enough to flourish again. Firstly, as you apply it in the Fall, it prepares the roots to cope with the winter and its lack of sun. As a result, it isn´t weakened, no matter how strong the next Winter is.

Secondly, it repairs all the damage that occurs during Spring and Summer, including extreme heat, drought, and constant activity such as plays, parties, and similar. And finally, this fertilizer not only prepare and repair but improves the ability of St Augustine grass to absorb all the nutrients it provides. This is how it guarantees that the grass can get prepared and repaired.


  • It is suitable for any type of grass, including St. Augustine grass and all its variants
  • Dual Actions
  • Fall session applied


  • It can only be applied during the Fall season
  • ​The sprayer is not included, and you must buy it separately
Scotts Turf Builder Southern Triple Action

This fertilizer will show you how to revive St. Augustine grass in one of the most effective ways. That is due to its potent triple action that kills, prevents, and feeds. So, no matter how damaged is your grass, this fertilizer will take you back the hope to recover it.


This powerful formula is able to kill the annoying fire ants, mole crickets, sod web worms, fleas, army worms, and ticks that might invade your grass. Despite avoiding your grass from weakening, killing those insects also allow you to enjoy outdoor activities safely.  But it doesn´t stop there because it can also kill many types of malicious weeds such as clover, dollar weed, hen bit, chickweed, among others. As a result, your lawn may get the best look for Summer or Spring seasons.


If your garden has one of the lucky sods that doesn´t have malicious weeds or is infected with insects, this fertilizer will help it stay that way. That is because it prevents that they appear and develop. So, if they were killed you don´t have to worry about having them back for at least 6 months!


This is how to make St Augustine grass thicker and greener. That is because while killing and preventing weeds and insects from your lawn, this fertilizer feeds your grass too.As it gets stronger and better fertilized, it resists heat and droughts more effectively.you can also use it for Bermuda grass.


  • You can apply it on all variants of St. Augustine grass, including Floratam
  • Its triple action of killing, preventing, and feeding occurs at the same time


  • It might take some time, perhaps weeks, to get insects killed but it definitively does it.
Milorganite 0636 Organic Nitrogen Fertilizer
If you have been trying to find the most natural and organic method on how to make St. Augustine grass thicker, this is the best option. Milorganite is a long-time recognized product in the market and is equally applied at homes and public spaces with excellent results.

Advantages of Milorganite as Organic Fertilizer

Although fertilization processes can be a little confusing for some garden owners, this product simplifies it because contains fair amounts of organic ingredients that will not harm any turf. Certainly, it is safe to use because it doesn´t harm your turf in any way.

One of its main ingredients is the organic nitrogen which is essential to avoid that St Augustine grass´ foliage gets yellow. Other organic nutrients feed the soil instead of feeding only the grass as chemical fertilizers do. It means that soil, all its microorganisms, and the grass are all nurtured and get stronger to resist the heat, droughts, salt, and the cold weather of the Winter.


  • It doesn´t burn the sod no matter if you exceed the amount of fertilizer
  • It is not necessary to water in


  • It is smelly but customers claim that its excellent results make it totally worthy
  • It is a little pricey when comparing it with other fertilizers
Green View 2129800 Starter Fertilizer
From the very first moment that you decide to plant your St. Augustine grass, you can contribute to developing its roots. In this sense, this fertilizer makes them stronger to cope with all the stages of the growing process. It makes it ideal for new lawns zones.

Starter Fertilizer

This GreenView brand fertilizer offers exactly what starters fertilizers must offer. First of all, it has a sufficient concentration of phosphorus which increases the grass's chances to succeed in the germination process.

Also, it contains immediate release nitrogen for boosting the germination and growing process. In addition, it contains time-released nitrogen to make sure that the grass is constantly being fed for about 8 weeks after planting it which is the crucial time for its development.


  • It also improves the absorption of nutrients
  • It can be applied right before or after seeding


  • Overusing the fertilizer may avoid the growth of the new grass, so it is important to follow the recommendations for this matter
Scotts Turf Builder Starter Food for New Grass Plus Weed Preventer
This is the Top Fertilizer for St Augustine Grass when the soil has problems to drain or absorb water. As those soils are really hard and cracked, roots have a difficult time to take hold.

Advanced Solid Technology (AST)

This technology is responsible for allowing the fertilizer to penetrate hard and clay soils. It doesn´t matter how compact they are because it can break them. Its benefits include allowing water penetration while dissolving quickly and providing uniform coverage. Furthermore, it is easy to apply with the usual equipment to spread fertilizers.

Similarly, this fertilizer also offers Aeration properties that can perforate the soil with tiny holes to allow more water and other nutrients to penetrate deep into the soil. As a result, the roots get fully nurtured until turning them healthy vigorous.


  • Information and instructions on how to use this product are also given in the Spanish language
  • It also works on clay soils and can fill dead spots too


  • It might require to get combined with another fertilizer as a complement

St. Augustine Grass Care Tips


St Augustine grass has many properties that make it ideal for certain soils and environments. However, it doesn´t guarantee that it will grow green and thick. This is why it is important to select a good fertilizer that allows it to be ready to let you enjoy its benefits.

Besides, this type of grass adapts well to different climates and types of soil and every one of them has a different requirement. Due to that, fertilizers come with different specifications that may vary according to them. These are some guidelines to help you select the best option for your lawn.


St Augustine grass requires specific nutrients to grow healthy and show its brilliant green color. Among them, phosphorus, nitrogen, and calcium are the most essential. But the soil of some areas might contain enough phosphorus that your fertilizer shouldn´t add additional dosages. The other nutrient, nitrogen, is essential to avoid that the leaf gets brown. And the potassium is the key to allow the grass to grow. Therefore,you always should check the nutrients of your fertilizer and see if they have all the nutrients you require according to your soil.

Organic or Inorganic Fertilizer? 

This a serious discussion due to the environmental cost it might have. Although a first impression might lead you to think that organics are a better option, sometimes the requirements of the grass and the soil might not be the same. Organic fertilizers tend to act slower than inorganic and that is an important aspect to consider.

In addition, if you apply chemical fertilizers according to what is environmentally acceptable, it shouldn´t be a big problem. When you make a decision, make sure you check what are the rules in your community regarding these matters. 

Time to Apply it

This grass has different requirements according to the time of the year. Due to that, the fabricates have developed a variety of formulas to cover the needs of each one of them. As you could see on this list, there special formulas for starters lawns, for the Fall, and those for all year round. So, when you select the Best Fertilizer for St Augustine Grass, make sure you choose the one that applies to the season you need to apply it. you can also check for more information about how to care for your augustine grass here.

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