Best Weed And Seed For St Augustine

Many broadleaf weed killers also harm St. Augustine grass; few herbicides are available, but most of them are weed control only. Read on to find out more. Keep your lawn looking lush with the best fertilizer for St. Augustine grass. View liquid, granular, and water-soluble picks here. A thriving and green lawn is a perfect complement for any home . But a lot goes into making it so . For instance, the best weed and feed for St Augustine grass would turn your yard into a paradise.

Applying ‘Weed and Feed’ Products to St. Augustine Grass

As you’ve likely discovered, many broadleaf weed killers also harm St. Augustine grass. There are a few herbicides available that are rated for St. Augustine, but most of them are weed control only, not weed and feed.

Be sure to check warning labels for any product you choose to use, some can be more harmful to you. (groveb/Getty Images Signature)

Unless you live in a frost-free climate, you should stop using any fertilizers at least six weeks before your average first frost date. St. Augustine is a warm-season grass that goes dormant for the winter, and you don’t want to stimulate growth that can be killed by frost. Weed-and-feed products are best reserved for spring and summer in these types of lawns.

The most common herbicide for St. Augustine lawns is Atrazine. Simply put, Atrazine is nasty stuff. It’s known to cause cancer and birth defects, and it’s showing up at alarming levels in drinking water. One look at the stern warnings on the label should make you think twice about putting it on your lawn!

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I use Expert St. Augustine weed and feed, and it does a great job. It’s by Expert and it’s just for St. Augustine grass, it will state on the bag, St. Augustine. After the St. Augustine weed and feed is down for about two months, I use the following mixture.

Lawn Care Recipe (mix all items and put into a sprayer connected to hose)
One full can of regular Cola pop (any kind-no diet soda)
One full can of beer (no light beer)
1/2 Cup of Liquid dishwashing soap (do NOT use anti-bacterial dishwashing liquid)
1/2 Cup of household ammonia
1/2 Cup of mouthwash (any brand)
1/2 -1 Cup of soaked water from steel wood pads
1/2 cup of Espsom salts (Use Epsom Salt on your lawn and in your garden)
You will notice bushier plants and brighter color blooms and your lawn will be thicker and greener. Sulfur and magnesium are vital to seed germination, production of chlorophyll and the conversion of sunlight into food. You can sprinkle the Epsom Salt in your garden around rose bushes, tomato plants, pepper plants, evergreens, azaleas, and rhododendrons, always water thoroughly after applying to get the salt into the soil at the roots. You will not have to worry about over using Epsom Salt in your yard and garden as most of the sulfur and magnesium will wash away. The salt will also keep many bugs away from sensitive plants and will also kill grubs in your yard and garden. Sprinkle with Epsom Salt on soil and work in before seeding lawn. The magnesium and sulfates help to germinate the seeds and make them stronger and healthier. You can also do this when you are starting plants for the garden from seeds.)

Magnesium is:
* A critical mineral for seed germination.
* Vital to the production of chlorophyll, which plants use to transform sunlight into food.
* An aid in the absorption of phosphorus and nitrogen, two of the most important fertilizer components.
Sulfur, the other major component of Epsom Salt, is also an important plant nutrient.

Sulfer may:
* Contribute to chlorophyll production.
* Make the primary nutrients (nitrogen, phosphorus and potassium) found in most fertilizers more effective.

I have an area in my yard (Houston) where grass does not grow well. Each year, I replace the soil and add new sod, spray for grubs, etc., but it always starts to flourish, then dies, ending up as brown and hard ugliness.

Question: the area in question is lighted with a nighteime flood light. Would this nightime light affect the growth cycle and inhibit it rooting properly?

My long established St. Augustine lawn (in Mobile, AL) appears to be afflicted with “SAD” – St. Augustine Decline. Internet sources indicate the only way to fight this viral desease is to plant plugs of resistant strains – specifically: Floratam, Floralawn, Raleigh, and Seville. I have not been able to find a place in the Mobile, Alabama area that sells any of these varieties. Do you know where I could get some? Thanks!

I have an established st. augustine lawn in terrell, texas. Unfortunately my lawn is over run with weeds. What household products can’t I use to weed & feed my lawn?

I live in central Arkansas just northwest of Little Rock.

I have a very large lawn, St Augustine grass that was probably planted in the late ’70’s. Now, a broadleaf weed has taken over part of the front lawn, north side, and the entire east side. The south and east sides are still lush, dark green and so soft. What should I use to kill the weeds, then what should I do to prepare for and re-seed the damaged areas?

According to the Texas aggie information, my grass would probably be Florentine, considering the date it was probably started.

Please respond. I would so hate to lose the rest of my grass.

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I live in coldest part of Canada. My back yard is full of weed, unfortunately all kind of weed. How do i get rid of it. I used so much weed control so far, works for just a few days and comes back in strong. will you advise please?

I live just north of Fort Worth and have an acre. It is a mixture of St. Augustine and Bermuda in the front yard with Bermuda and just plain prairie grass in the back yard. What can I mix in a 20 gallon sprayer to put weed control on the whole yard at one time that will not harm the st. Augustine but still get weed control?

I live the North Texas and accidentally put Vigoro 28-0-3 Weed and Feed on my St Augustine ? Will it die? What should I do?

I’m slowly losing my St. Augustine grass. It was put down a little over three years ago. I’ve treated the lawn for grub, treated it for brown patch and may have stopped those problems. I would like to put down a winterizer and Pre-emergent for fall. Where can I find 5-10-20 in Mobile, AL.
Thanks for your advice,
Barbara Sharp

I live in Augusta Ga and have St Augustine grass. I currently have a bug that is black w/wings and has a orange line down each side of its wing. it with fly or hop as you walk through the grass. it makes the blades of the grass rusty brown. I was told its a spittle bug but I don’t see any picture of it looking like one. What is it & how do I treat it ?
thank you

Hello, I’m from Texas and I love Saint Augustine grass. I now reside in Joliette, Quebec Canada. Cou you possibly tell me if I can have the variety floralawn here?

I was told that that I have possibly two different kinds of bugs and I have a few varieties of weeds. I’m going crazy, please try to answer this note. I’m really going nuts and the professionals that have come to my home have only killed my grass.

Since going fully organic 6 years ago I have had to learn how to let go of my OCD lawn care! I’ve learned to enjoy the flowers of dandelions…pulling them before they seed. And clover is not the problem for me that it was before when I see the kiddos pulling it and eating a few of the tasty leaves knowing that it won’t harm them! Thank you for your dedication to organic methods!

I have been watering my St. Augustine Grass as It need help after the Drought in S. California affected a once lush lawn .I can see it is regrowing but certain area’s where the Grass once grew is now gone and the soil is now bare. What can I do to help the grass spread quicker ,Thanks for any advice.

I re- seeded my lawn last year, germination results are extremely disappointing.
Presently I see a lot of crab grass , what should my action be?
I live in New Jersey.

The Best Fertilizers for St. Augustine Grass of 2022

This warm-season grass thrives in hot, humid regions, but it needs adequate nutrients to achieve its full potential and spectacular blue-green hue.

By Glenda Taylor | Updated May 12, 2022 10:23 AM and its partners may earn a commission if you purchase a product through one of our links.

A favorite in warm coastal regions due to its ability to tolerate salt, high humidity, and toasty temperatures, St. Augustine grass (Stenotaphrum secundatum) is widely grown in Hawaii, Florida, the Gulf states, and elsewhere in USDA growing zones 8 through 10.

St. Augustine grass thrives in well-drained soil and imparts an appealing blue-green tone to lawns. Although it prefers sunny areas, it tolerates a bit of shade. While this vining-type grass spreads rapidly, it can grow a bit spindly if the soil doesn’t have adequate nutrients, which is the case with a lot of sandy soils in the coastal states.

To reach its full, lush potential, St. Augustine grass should be fertilized during the summer growing season. Ahead, learn what to look for when choosing the best fertilizer for St. Augustine grass, and find out why the following lawn fertilizers are top performers.

  1. BEST OVERALL:Scotts Southern Turf Builder Lawn Food
  2. BEST BANG FOR THE BUCK:Pennington 100536576 UltraGreen Lawn Fertilizer
  3. BEST WITH SPRAYER:Simple Lawn Solutions Commercial Grade Lawn Energizer
  4. BEST LIQUID:Simple Lawn Solutions Maximum Green Liquid Fertilizer
  5. BEST NATURAL:Milorganite 0636 Organic Nitrogen Fertilizer
  6. BEST SOD STARTER:Pennington UltraGreen Starter Lawn Fertilizer, 14 LBS
  7. BEST WATER-SOLUBLE:Miracle-Gro Water Soluble Lawn Food, 5 lb.

What to Consider When Choosing the Best Fertilizer for St. Augustine Grass

Fertilizing adds essential nutrients to soil that plants need to thrive. The first step in choosing a fertilizer for St. Augustine grass is to have the soil tested to determine whether it lacks specific nutrients. Most communities have county extension agencies that will test the soil’s nutrient content.

Once you know which nutrients, if any, are lacking in your soil, you’re in a better position to select an optimal lawn fertilizer. By and large, St. Augustine grass will benefit from the same fertilizers used on other types of lawn.

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N-P-K Ratio

Lawn and turf fertilizers are labeled with the amounts, by weight, of three specific nutrients they contain: Nitrogen (N) brings out the color in the grass and speeds growth, phosphorus (P) encourages bud and seed formation, and potassium (K) encourages healthy plant growth. While all three are required for St. Augustine grass to grow well, the nutrient that soils lack most is nitrogen.

St. Augustine grass usually contains more nitrogen than phosphorus and potassium. A typical turf fertilizer formulation, for example, has an NPK ratio of 15-1-5. As you browse lawn fertilizers, you’ll notice how many different NPK combinations they offer, but nearly all of them are highest in nitrogen.

Liquid vs. Granular vs. Water-Soluble

Lawn fertilizers are made in three main formulations: liquid, granular, and water-soluble. There’s no “right” option here—the form of fertilizer that’s best for your lawn is mostly a matter of personal preference.

  • Liquid: For a quick boost of growth, many growers and groundskeepers opt to apply liquid lawn fertilizer because it’s quickly absorbed through the blades of grass and immediately goes to work, encouraging new growth. Results can be seen in as little as 3 or 4 days after applying liquid fertilizer to St. Augustine grass. The product can be purchased either full strength or in a liquid concentrate for diluting and applying via a pump-type garden sprayer. The caveat with liquid fertilizers is that they quickly pass through and out of the lawn, so they may need to be applied more frequently than granular types.
  • Granular: Resembling tiny grains, granular fertilizers contain many of the same nutrients that liquid fertilizers contain. They differ slightly in that granular fertilizers are often released more slowly, which means the grass’s roots can access the nutrients over an extended period. Granules won’t give you the same rapid greening-up that liquid fertilizers will, but they typically require less frequent application. Granular fertilizers are applied to the lawn using a spreader.
  • Water-Soluble: Though this fertilizer comes in a granular form, it’s not meant to be applied with a spreader. Instead, water-soluble fertilizers are made to be applied using a hose-end dispenser that connects to a garden hose. The water flows through the dispenser, dissolving and diluting the granules and dispersing the fertilizer via a hand-held sprayer. Like liquid fertilizer, water-soluble fertilizer can green up the lawn fairly quickly.
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Organic vs. Synthetic

Most lawn fertilizers contain chemical and synthetic ingredients, but a few are made from all natural components.

Organic: Natural organic fertilizers contain the same nutrients as synthetic fertilizers, but they come from natural sources, such as earthworm castings and composted manure. They’re usually more expensive than synthetic formulations because it takes more work to gather the ingredients and process them into fertilizer. The upside is that organic fertilizers are eco-friendly and unlikely to pollute waterways or harm aquatic life.

Synthetic: Chemicals made in a laboratory to mimic the nutrients found in nature are the main components of synthetic fertilizers. Depending on the product, synthetic fertilizers may also be enriched with essential minerals found in healthy soil, such as calcium, magnesium, or boron. While lawns will react to both types of fertilizers favorably, the high nitrogen content in some synthetic fertilizers can harm aquatic life if it runs off in waterways.


Knowing when to fertilize is just as important as using the right fertilizer. St. Augustine grass should be fertilized for the first time in spring only after turning fully green. Fertilizing it before that time may damage the grass. Apply an all-purpose lawn fertilizer that’s high in nitrogen at the rate recommended on the package. After that, St. Augustine grass should be fertilized every 6 to 8 weeks, depending on the product’s recommendations.

St. Augustine grass doesn’t grow well from seed, so it’s usually propagated through sod or plugs. When starting a new lawn of St. Augustine, apply a lawn starter fertilizer that offers a balanced ratio of nutrients, such as 10-10-10, to the ground beneath the sod. As the roots grow downward, the fertilizer will be absorbed and boost plant health.

A high-nitrogen fertilizer can be applied a month later, followed by periodic applications during the growing season. Stop fertilizing in the fall approximately 1 month before outdoor temperatures drop to around 55 degrees Fahrenheit. At this temperature, St. Augustine grass goes dormant, and won’t need any fertilizer until spring.

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St. Augustine grass looks its best when it gets all the nutrients it needs, which is why periodically applying a general lawn fertilizer will increase the lawn’s lushness—and the chances that you’ll have a uniformly green lawn. Choosing between liquid, granular, and water-soluble is mostly a matter of personal preference. These lawn fertilizers are all suitable for boosting nutrients in a St. Augustine lawn and keeping it looking lush.

Finding The Best Feed And Weed For St Augustine Grass

St Augustine grass is perfect when you want to make your lawn look good. However sometimes, no matter how much we’ve been fertilizing it, the lawn still doesn’t look as green as we originally wanted. Don’t worry we’ve all been there, and as someone who overcame this issue, we’re certain that this problem stems from the fact that your grass simply needs some extra care.

So to shed more light on this issue, we’ve decided to share our knowledge with you, and help you pick the best weed and feed for St Augustine grass. All to ensure you have a thriving lawn!

Top 7 Best Feed And Weed Products For St Augustine Grass: Comparison Chart

Type Area Covered Target Pests Primary Nutrients (N-P-K) Weight
Scotts Turf Builder Southern Triple Action Granular 4000 sq. ft. Dollarweed, clover, oxalis, plantain, chickweed, henbit and others 29-0-10 13.32 pounds
Spectracide 96262 Liquid 7500 sq. ft. Major broadleaf weeds 20-0-0 32 oz
Sunniland 128820 Granular 5000 sq. ft. n/a 20-0-6 20 pounds
Fertilome Granular 2500 sq. ft. Crabgrass, sedge, paspalum, spotted spurge and others 15-0-4 16 pounds
BioAdvanced 704840B Granular 5000 sq. ft. Broad lead, grassy weeds, crabgrass 35-0-3 12.5 pounds
GreenView 2131251 Granular 5000 sq. ft. Crabgrass 26-0-4 13.5 pounds
The Andersons Granular 16000 sq. ft. Over 250 weeds 16-0-9 40 pounds

Saint Augustine Grass: Definition and Where to Grow It

St Augustine grass is a warm-season grass cluster that can be grown on the lawn or for pasture, in large farms. It has a thick sod, which helps it eliminate grasses and weeds to create a grass colony where it grows. People use weed and feed for St Augustine grass alongside the traditional care and maintenance practice.

St Augustine grass does well in warm areas like the Southern parts of the United States but can tolerate colder coastal regions with mild winters. However, according to a lot of st Augustine grass reviews, it can also do well in any southern climate, with the right soil.

And speaking of it, the grass does well in soil with a pH of 5 and 8.5, which is a broad range for many growers. So before growing the grass, it’s best to test your pH and adjust it where necessary.

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Choosing the Best Feed and Weed for St Augustine Grass

When you want to choose the best fertilizer for St Augustine grass you have to keep in mind several important factors. So let’s take a look at the essentials of the St Augustine fertilizer:

Quick-release vs Slow-release?

Slow-release fertilizers are insoluble, while quick release fertilizers are soluble. Quick-release fertilizers give results within two weeks, and slow-release fertilizers take up to ten weeks to give results.

Slow-release fertilizers make the best weed & feed for St Augustine grass. They are gentle on the lawn and do not burn it out even at high temperatures. They are less labor-intensive as the next application can only be in 8 or 10 weeks.

Slow-release fertilizers are slightly expensive than fast-release fertilizers. When used as a St Augustine weed and feed, they bolster fast growth on your grass and help it overcome weed as well as protect it from diseases typical of poor nutrition.

Granular vs Liquid

St Augustine weed and feed products come in two types; liquid and granular. Liquid fertilizers are more convenient for a small lawn since they can be connected to your house and easily spread across the yard.

Liquid weed and feed fertilizers enhance the soil and detoxify it from impurities and harmful agents, making it great for growth. Using liquid weed and feed for St Augustine lawns will decrease the soil compaction and improve the drainage of the soil, making your St Augustine grass flourish.

Granular fertilizers are suitable for mid-size and large lawns as the spreader will be easier to push around to ensure it is spread easily and efficiently. It doesn’t require much mixing, but you should read through the instructions to ensure the spreader has the right measure. This way, you get all the benefits from the best weed and feed for st Augustine grass 2021.

Another important thing to point out is that granular fertilizers are the best weed and feed for St Augustine grass in Florida and other high-temperature areas. That is because they do not collect on the blade of the grass; hence will not burn it.

Content Ratio

All the fertilizers must have the content ratio on the packaging. Usually, you can find a label with letters like N-P-K, which means Nitrogen, Phosphorus, and Potassium. 10-4-10 indicates the percentage: 10% Nitrogen, 4% Phosphorus, and 10% Potassium. The content ratio is per 100 pounds of fertilizer alone unless indicated otherwise in the packaging.

Overall, the best fertilizer for St Augustine grass should have less phosphorus and potassium but enough nitrogen.

Hacks for Fertilizers for St Augustine Grass

  • Make sure your soil’s PH levels are good: As mentioned, they should be from 5 and 8.5. Once the nutrients in your soil are fine, you can choose the best weed and feed for Saint Augustine grass.
  • It is best to start fertilizing your grass during the spring and fall seasons: That is because the St. Augustine grass is most active during these seasons.
  • Protect your grass from trampling: St Augustine grass does best in areas with less traffic. Otherwise, make sure to separate pathways for people and animals or put a fence to keep away animals that might ruin your turf.
  • Control the grass growth using a lawnmower: The best height setting for St Augustine grass is anywhere between 2.5-3 inches. This ensures the grass gets abundant nutrients and nourishment for growth.
  • Use herbicides to control weeds: In as much as fertilizers can control weed in St. Augustine grass, they are not very efficient with pre-grown weed.

St Augustine Grass Fertilizer FAQs

To better understand the best weed and feed for St Augustine grass, you need to know the answers to some of the most common, but important questions:

What Quantities of Weed and Feed Are Perfect for St Augustine Grass?

St Augustine grass weed and feed fertilizer require that you apply the correct amount of fertilizer. Too little, and you end up with a nutrient-deficient lawn. On the other hand, too much of it creates a suitable environment for pests to thrive.

What Is the Best Way to Apply Weed and Feed on St Augustine Grass?

UUse a spreader to apply weed and feed on your grass. The ideal St Augustine weed and feed spreader for a small lawn is a chest-mounted spreader. Ensure the fertilizer does not cling to the blade of the grass to avoid burning.

How Best Can I Take Care of My St Augustine Grass?

For a lush green lawn, you have to apply the right amounts of St Augustine fertilizer, mow correctly and use the right methods to control pests and disease. It would be best if you did proper scouting on a fertilizer before you buy and apply it to ensure it is correctly formulated for your lawn.

If there is a lot of weeds on the new grass, and they can’t be controlled by herbicides – use slow-release fertilizers. They can control weed AND enhance the growth of your grass. Just remember that Broadleaf fertilizers will harm St Augustine grass, so make sure to avoid them.

And to determine the correct amount of weed and feed for St Augustine grass, divide the first number indicated on your fertilizer’s label by 100. This gives you the weight you need to apply over a 1,000 sq. ft area for it to be within the recommended ratio of 1 pound per 1,000 sq. ft of St. Augustine grass weed and feed.

Final Thoughts

When you have applied the right weed and feed for St Augustine grass, your yard would look just like one of those great southern lawns. And what’s great is that it’s not that hard to get the best weed and feed for St Augustine grass 2021. As long as you keep in mind all the essential factors, you will find the best fertilizer in no time! So good luck, and feel free to let us know if you have any more questions!