Top 7 Best Weed Killer For St Augustine Grass 

 November 15, 2019

By  Agriculturist Musa

Best weed killer for St Augustine grass: As we all know, grasses are an essential aspect of our yards, and they give the ultimate attraction. Maintaining them is not so easy because we have to carry is pretty well to look good. However, there are different types of grasses, which are used to keep our lawn or yard beautiful, and today we are going to discuss St. Augustine grass (Stenotaphrum secundatum) and how to maintain them well from weed. It is a common warm-season grass that grows in U.S. Department of Agriculture plant hardiness zones.

Applying weed killer on St. Augustine grass is one and easiest way to keep the weeds under control, but like other things, it also comes with a list of deliberations. The first and foremost important thing is to choose the best weed killer that will not abolish your grass and make them safe. To make this process easier, we have prepared a list of the best weed killers for St. Augustine grass. We will discuss the quality of the enlisted products along with advantages and drawbacks. I hope this will ease your way to find the best option for your St. Augustine grass and keep them safe.

1. Southern Ag Atrazine 

Southern Ag Atrazine St. Augustine Grass weed killer is a favorite and practical thing in this line-up. It is one of those weed killers that can appropriately target the weeds and not kill the grass. One of the best choices, regarding that this is a better weed killer for St. Augustine Grass. It has a lot of right sides.

Key Features

  • This weed killer kills many broadleaf weeds
  • It can be used in centipede grass
  • It provides suppression of crabgrass
  • Controls emerged weeds and weeds from seed
  • One gallon of spray


  • It is very safe to apply on the grass
  • Kills over 200 broadleaf weeds
  • Work fast
  • Reasonable price


  • Acts faster but do not remain for long

So, the product details and Southern Ag Atrazine St. Augustine Grass weed killer's advantages seem moderate. Still, within a reasonable price, this is a better option for maintaining our lawns. You might find a better option according to your need, but this is recommended in our list.

2. The Andersons Pro Turf Barricade

The Andersons Pro Turf Barricade weed control is one of the best and most user-friendly, effective gritty weed remover products on the market. This thing is considered to help demolish over 30 grass and broadleaf weeds in recognized turf grasses, lawns, landscapes, and ornamental beds. It comes with .48% of the active ingredient Prodiamine. If we talk about the other highlighted features of this weed controller than we have the following points,

Key Features:

  • Allows for more units per square inch of chemical
  • Designed to prevent weeds, and will not assist in eliminating existing weeds
  • It has a fast working capacity


  • Easy to use
  • Easy to spread
  • Perfectly works after application
  • Value for money


  • It stops weed growth, but do not kills the existing
  • It has a seasonal fact, does not work effectively in all seasons

Overall, The Andersons Pro Turf Barricade weed control process is effective indeed but has some bindings as well. It is highly recommended in the fall season because it has some seasonal issues and works perfectly. Thus, it is undoubtedly a quality product in the weed killer lineup.

3. Quali-Pro Prodiamine 65 WDG

Quali-Pro’s Prodiamine 65 WDG delivers pre-emergent grass and broadleaf weed control. Malleable applying method permits for both spring and fall use providing season-long crabgrass control. This weed controller is available in a 5-pound bottle. Looking at the key features, we found the following points,

Key Features

  • It is a professional type of product
  • Multipurpose use
  • Effective against Annual bluegrass (Poa annua), Henbit, Knotweed, Chickweed, Spurge, Foxtail, Goosegrass
  • It has Prodiamine 65% active ingredients


  • Knock out weed early
  • Prevents and restrict weed for a long time
  • Easy to use and maintain.
  • It takes a very short time to set up
  • It heats up steadily.


  • Not a weed killer, it’s a preventer
  • A little bit of pricy

After watching all the features and advantages of Quali-Pro’s Prodiamine 65 WDG, we can consider this the right product, but the major drawback is the price and slow effectiveness. It is not a good option for fast working ability, but it is recommended as the right product.

4. Scotts Select States Turf Builder

Scotts Turf Builder is a weed killer and condenses your lawn to help multitude out future weeds. Regular feedings deliver the nutrients to your lawn to look at their best and endure the stresses of heat, deficiency, and family commotion. You can use it on St. Augustine grass (including Floratam), centipede, zoysia, and carpetgrass lawns. You have to use it when grass and weeds are actively growing. If we search for the main features if this weed killer, then we will see the following points,

Key Features

  • Kills dollar weed, clover, and other lawn weeds
  • It feeds grass to crowd out future weeds
  • Builds strong, deep grassroots to strengthen against heat and famine
  • Not for use on Bermuda grass


  • Perfectly works for St. Augustine grass
  • Easy to use
  • Easy to speared
  • Works fast


  • Bit costly
  • Not for all kind of grass type

Finally, watching Scotts Turf Builder's features is a better product, especially for St. Augustine grass, which is our main concern. So, this product is highly recommended for preventing the grass weed problem.

5. Doctor Kirchner Natural Weed Killer

Doctor Kirchner Natural Weed Killer always wants you to take care of your garden and ensure that they are free from weed. This Natural Weed Killer quickly and safely takes care of all the weeds and does the treatment required for the land. As it is made with ocean water and food-grade vinegar, it is safe for pets and kids. Besides, it also has some useful features, and they are as follows,

Key Features

  • Made with natural and less harmless ingredients.
  • Normally not used on the lawn.
  • Provide an alternative to harmful herbicides and toxic weed treatments.
  • No Mixing, No Glyphosate and No Hormone Disrupting Chemicals
  • Using this product directly is safe for Pet, kid, and the environment


  • Simple and user friendly using
  • An amazing product according to the users
  • Polished finish that gives a classy look.
  • Cools down easily and auto shuts off
  • Three years warranty


  • Sprayer quality is not up to the mark

From all sides, Doctor Kirchner Natural Weed Killer is one of the finest products available in the market, and it has some drawbacks, but they can be ignored because it has more effectiveness.

6. Green Gobbler Vinegar Weed Killer

According to science, Vinegar is one of the best home-based regular weed killers that you can ever expect. The product from Green Gobbler, which we are talking about, is made with Vinegar. Because of the perfect blend of water and Vinegar, this weed killer is the easiest and safest way to prevent weeds. But you have to be careful and not apply it to the turfgrass you are raising. You have to handle it with care and make sure that you spray this on the weeds only or the grown-up grasses. Other highlighted features of this weed killer are as follows,

Key Features

  • It kills weed and grass very fast
  • Use on crabgrass, dandelions, clover weeds, white clover, moss, etc.
  • This product is safe to use anywhere you want.
  • This weed killer is certified for organic uses
  • It has one of the most powerful formulae for preventing weed in this lineup
  • 30 days money-back guarantee


  • Tremendously operative on any weed
  • 20% acetic acid destroy weeds faster
  • Safe for pets and kids
  • 100% organic
  • It is glyphosate-free
  • It can also kill moss


  • It cannot be used for commercial use
  • Vinegar does not cover-up large space
  • In the long run, can be questioned

Green Gobbler Vinegar Weedkiller is an organic and useful product, and it can be recommended for the users, but it is not for commercial use. Therefore, this is not your option if you want to use it for a large space or big lawns. But this is one of the best choices for household use and doing it carefully.

7. Natural Armor Weed & Grass Killer

Natural Armor Weed & Grass Killer is another organic product on our list. It is a natural product and not harmful. You can use this killer anywhere you don’t want to see the weed. Such As, Around Flower Beds, Shrubs and Trees, Barns, Driveways, Edging, Fence Lines, Foundations, Gravel Areas, Mulch Beds, Overgrown Weed Areas, Parking Areas, Patios, Pavers, Pool Areas, Rock Walls, and Pathways, Walkways, Wells & Water Systems. Its multipurpose application makes this thing demandable because it will indeed affect the weed and remove them. Let us check out the features.

Key Features

  • This thing has no glyphosate
  • You can use this killer anywhere
  • It is really fast-acting, you will find the results in front of your eyes
  • Without asking any question 30 days money-back guarantee


  • Free of harmful chemicals
  • Safe for the users and surrounding people
  • Multipurpose use
  • It is very easy to use


  • Advertised as a fast killer but it is not

So, Natural Armor Weed & Grass Killer has useful features, and it is recommended for the right choice because it is natural and can prevent the weed you want.

How do you choose the best weed killer for St Augustine grass: (Buying Guide)

Things you have to consider before buying a weed killer for St Augustine grass: Several different varieties of this common lawn grass exist, each with its list of welfares. They also have some types and maintenance theory. For example, the grassing needs at least four hours of sunshine every day. This type of grass has more shade tolerance than others.
St. Augustine goes through a period of invisibility and turns brown in winter, but this thing quickly greens up once spring and warm temperatures attain. Now, it is known to us that weed is another mate of grasses, because they grew up and destroys the beauty and forces them to become less fertile. The best way to prevent this problem is by
applying weed killers over the grass. That is why now we are going to discuss the best weed killer for St. Augustine grass.
You must know before you buy that not all medicines or killers are suitable for any weeds. On the other hand, according to the grass and land, your choice might vary. For example, rocky areas may use a non-selective weed killer, while areas near waterways may require an organic one. Regarding that, you have to choose. Most of the time, a few basic things remain the same for the weed killers, which you must consider before you buy.

Here is a list of things that you must consider in your mind before choosing the best weed killer:

  • Herbicides will not kill your grass. It is essential to ensure that your selected product only prevents the weed, not doing any further damage to your grass. Choose a product that won’t kill your lawn grass.
  • You must know the type of weeds in your lawn. For better and safest use, it is crucial to know about the weed because then you will find the perfect and accurate killer for your grass.
  • You must know the type of weeds in your lawn. For better and safest use, it is essential to know about the weed because then you will find the perfect and accurate killer for your grass.
  • You have to ensure the safety of kids and pets. In your lawn, these are things that will move around, so use organic and natural products for safety.
  • Different weeds grow in different states like flower beds. So, first, know about the place and weed type, then go for the killer.
  • Not all the products will cover the whole space that you need. According to the area and space, you have to choose the weed killer. Because there is a limitation of your weed killers, they can act correctly according to their limits. So be sure about that. For large spaces, choose commercial killers that cover large spaces.
  • You have to know how long for weed killer to work.

Final Verdict

To sum up, the given list has seven quality products according to the need we have to kill or prevent the weed from our lawn. You can wisely choose your product by watching their features and advantages. Be aware of your need and choose wisely, because there are many products available in the market, but some are worthy.

Agriculturist Musa

Agriculturistmusa is a graduate student in agriculture. He is doing research on home improvement, indoor, and outdoor gardening! He loves to decorate the home, garden, and lawn care. Based on his experience about home, improvement, gardening, and lawn; he is sharing his thought and opinion, tips, and tools so that a beginner can get started right away. Find him on Twitter here. Happy reading!

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