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How to Kill St. Augustine Grass?

How to Kill St. Augustine Grass?

Do you have a pesky St. Augustine grass infestation that just won’t go away? Are you tired of using harsh chemicals that don’t seem to do the trick? If so, then this is the blog post for you! In this article, we will provide you with a comprehensive guide on how to kill St. Augustine grass once and for all. We’ll answer common questions and provide tips and tricks that will help you achieve success. So read on and get started today!

St. Augustine Grass Identification (detailed answer)

St. Augustine grass (Scientific Name: Stenotaphrum secundatum) is a warm-season turfgrass that is widely used throughout the southern United States and parts of Central America as a residential, commercial and recreational turfgrass. It has proven to be highly salt tolerant and disease resistant, making it ideal for coastal areas with salty soils and humid climates.

While St. Augustine grass is popular among homeowners, some gardeners are looking to get rid of their lawns or replace it with another type of grass. This can be difficult due to the tough nature of the turfgrass and its ability to spread quickly.

Identifying St. Augustine grass can be difficult for the untrained eye due to its similarities with other warm-season turfgrass varieties. It’s important to correctly identify your lawn type before attempting any kind of control or removal, as treatments that work on one type of grass may not have the same effect on others.

St. Augustine has a medium-coarse texture and usually grows in a bright green color, though it can look yellowish-green in drought conditions. Its leaves are broad and flat with pointed tips and their edges are distinctly scalloped or serrated. The stems of this grass are relatively thick and conspicuous; they form dense mats when growing close together and develop shallow roots near the soil surface when mowed short.

If you’re still unsure of your grass type, a soil sample taken from your lawn and tested at a local extension office can help to confirm identification. Knowing the type of grass in your yard is also important for selecting appropriate control methods. Certain herbicides are only formulated for certain types of grass, so proper identification helps ensure that any treatments used are effective and safe. [1], [2]

St. Augustine Grass Identification

Ways to Deal With St. Augustine Grass (detailed answer)

Now after correctly identifying the grass, it’s time to discuss some ways to deal with it. Luckily for you, there’s a variety of options that you can choose from depending on your needs. In this section, we’ll discuss three of the most popular ways to deal with St. Augustine grass: chemical control, manual removal and cultural practices.

Tilling (detailed answer)

One of the most effective ways to kill St. Augustine grass is to utilize tilling. This method involves using a tiller or a power tiller to dig up and remove the weeds from your lawn without the need for any chemicals. This is ideal for gardeners looking to keep their lawn chemical-free, as it does not involve the use of herbicides that can harm the environment or other plants in your yard.

The process itself is quite simple and straightforward; you will simply rent or buy a tiller and then use it to dig up chunks of soil that contain the turfgrass roots. It’s best to do this when the soil is moist so that it breaks off easily and comes out with minimal effort. Once you have extracted all of the weeds and St. Augustine grass, you can then fill the area back in with topsoil or turf starter mix and seed it with your desired grass type.

Keep in mind that tilling is a labor-intensive process, so if you are dealing with a large area of weeds it may be better to opt for chemical control instead. Additionally, it’s important to note that tilling itself won’t guarantee that all of the weed seeds have been removed from your lawn, so it’s still possible that some of them could re-germinate over time.

What’s more, for the treatment to be effective, you will need to wait until it’s dry without any rain for at least a day to ensure that the weeds are completely dead. In addition, it’s preferable to wait until the grass has gone through its dormancy period as this will make tilling more effective.

However, tilling when it’s dry won’t only get rid of grass but also soil particles, which could end up damaging the soil structure if not done carefully. In order to prevent this from happening, you can create beds or raised ridges that can keep the tilling process confined and focussed on the grassy areas only.


Hack the grass out (detailed answer)

Another way to get rid of St. Augustine grass is to hack it out with a shovel or hoe, although this method can be quite labor-intensive and time-consuming. This works by physically digging up the grass and its roots in sections, which can then be disposed of in a compost pile or trash bag. This can be done with a shovel, spade or sod cutter and is best done when the grass is actively growing in late spring to early fall.

Cutting out small patches of St. Augustine grass can be labor-intensive, but there are several advantages to this method. It’s often more cost-efficient than chemical control and doesn’t leave any toxic residues in the soil like some herbicides may. Additionally, manual removal is considered one of the safest methods for controlling St Augustine grass as long as all plant material that’s removed from the site is also disposed of properly.

Again, make sure to get rid of the entire food system of the grass, including its roots. Digging just a few inches deep should be enough to remove all of the plant material, allowing you to replant with your desired turfgrass afterwards.

You can later make use of the grass by adding it to your compost pile or using it as mulch in garden beds. Just dry out the grass beforehand in order to prevent it from establishing itself again in a new area.

Cover it (detailed answer)

A much safer method of controlling St. Augustine grass is by covering it up with a physical barrier, such as tarp. This method prevents light from reaching the grass and causes it to die off in a matter of weeks. The only downside to this approach is that you may find yourself having to replace the cover often due to wind, rain and other weather conditions.

If you decide to use this method, make sure that you choose a heavy-duty material so that the sun won’t be able to penetrate through, and always ensure that all edges are securely covered. Additionally, it’s important to remember that even though the grass will eventually die off when covered, it’s still possible for weeds or new turfgrass seeds to germinate underneath the cover if not monitored closely.

For best results, you should perform the treatment in the summer season when the sun is at its strongest. However, if you plan on planting a new grass variety in the same area, it’s best to wait until the fall season as this will give your grass enough time to establish a strong root system before winter sets in.

Cover it

Suffocate it with mulch (detailed answer)

Mulching is another effective way of controlling St. Augustine grass without using any harsh chemicals or sprays. The idea behind this method is to suffocate the grass by laying down a thick layer of organic material, such as wood chips or shredded bark, that will block out light and prevent photosynthesis from taking place.

This method has several advantages over chemical control, such as being completely non-toxic and environmentally friendly. Additionally, mulching helps to increase soil fertility and encourages beneficial organisms like earthworms that help to improve soil structure.

When performing this treatment it’s important to use an organic material that’s at least two inches thick so that all plant material is deprived of sunlight and air circulation.

Chemical treatment (detailed answer)

If all else fails, you can always opt for a chemical treatment to get rid of St. Augustine grass. There are several herbicides available on the market that are designed specifically for this purpose, such as glyphosate that work by killing the roots and leaves of the plant.

2,4-D is another good option that has been proven to be an effective way of controlling St. Augustine grass.

This is an easy way to speed up the process and achieve results quickly, but it’s important to remember that some chemicals remain in the soil even after they’ve been applied so caution should be taken when using them around gardens or other areas with sensitive plants. Additionally, most of these products require multiple applications before they start to take effect.

When applying any kind of herbicide make sure to follow all instructions on the label carefully and never use more than what’s recommended. Additionally, it’s important to wear protective clothing and ensure that the product is disposed of properly according to local regulations. [1], [2], [3], [4]


How do you kill St. Augustine grass naturally? (detailed answer)

One of the best ways to kill St. Augustine grass naturally is by choking it out with a thick layer of mulch. Mulching allows for air and moisture to reach the grass, but prevents sunlight from reaching it. This deprives the St. Augustine grass of its energy source, causing it to slowly die out over time. Depending on how thick you apply your layer of mulch, it may take several weeks or even months before all of the grass has died off completely.

An alternative method to killing St. Augustine grass naturally is by using vinegar. This method requires that you spray a vinegar-water mix directly on the grass. The acetic acid in the vinegar will burn the blades of the grass, causing it to die out over time. This method works best for small patches of St. Augustine grass and can be repeated as often as necessary to achieve full coverage.

How do you kill St. Augustine grass naturally?

How do you stop St. Augustine grass? (detailed answer)

The best way to stop St. Augustine grass is to kill it before it spreads into other areas of your lawn. There are several methods you can use to get rid of the grass, including chemical herbicides and non-chemical methods such as physical removal and using a cover.

Chemical herbicides are an effective method for killing St. Augustine grass quickly and completely. Pre-emergent herbicides are applied before the seed germinates while post-emergent herbicides are used after the weed has started growing and has already established itself in your lawn. Some common ingredients found in chemical herbicides include glyphosate, glufosinate, diquat, 2,4-D amine salt, MSMA salts, and carfentrazone ethyl. Always wear protective gear such as gloves and a long-sleeved shirt when applying chemicals, and make sure to follow the instructions on the label.

What is the easiest way to remove St. Augustine grass? (detailed answer)

The easiest way to remove St. Augustine grass is by using a non-selective herbicide. Non-selective herbicides are designed to kill any vegetation they come into contact with, so they can be used to eliminate St. Augustine grass without worrying about damaging other plants or lawns in the area. Before applying the herbicide, it’s important to mow your lawn and cut back any surrounding foliage. This will ensure that the herbicide has maximum contact with the weeds you’re trying to eradicate.

Once you’ve prepared your lawn for treatment, apply the herbicide according to manufacturer instructions and wait for it to start doing its job. Depending on the product you use, it may take a few weeks to several months for the weedkiller to take full effect. Once it does, you should be able to remove St. Augustine grass from your lawn or garden with relative ease.

What herbicide kills St. Augustine? (detailed answer)

One of the most effective herbicides for killing St. Augustine grass is a product containing glyphosate. Glyphosate is an active ingredient found in many popular weed killers and acts as a systemic herbicide, meaning that it kills all parts of the plant from which it comes in contact with including roots, stems, and leaves. It works by blocking certain enzymes that are essential to plant growth and development. When sprayed on a lawn, it will kill any St. Augustine grass within 24 to 48 hours.

Additionally, if you have large areas of weeds or grass that need to be cleared away, you can use a combination of glyphosate and other active ingredients such as 2,4-D (2-ethylhexyl ester). This is effective in killing larger areas of weeds and grass, but it can also kill desirable plants if not used correctly. Be sure to read the label before use and follow all safety instructions.

Does vinegar kill San Augustine grass? (detailed answer)

Yes, vinegar can be used to kill St. Augustine grass. Vinegar is a natural herbicide that kills most vegetation on contact.

To use it effectively, you’ll need to purchase an herbicidal grade of 20% acetic acid (also known as horticultural vinegar) and add it to a sprayer. Be sure to wear protective clothing and safety glasses when applying the vinegar, as it can damage both skin and eyes.

Useful Video: How to Kill St. Augustine Grass


St. Augustine grass is one of the most popular and hardy lawn grasses available today, but it can be a challenge to get rid of it completely. Luckily, there are several methods available to homeowners that can be used to effectively kill this grass and make room for the lawn of your dreams. The best approach will depend on the size of your yard, budget, and timeline.

In this article, we have looked at several methods for killing St. Augustine grass that range from chemical to mechanical and natural approaches. Chemical herbicides are the most commonly used option due to their convenience, but they can be expensive and require careful handling and application. Mechanical methods like tilling or digging up the turf are fast, but laborious and may not provide the desired results unless vigilance is maintained. Finally, natural alternatives such as mulching can take longer, but are easier on the environment and your wallet.

No matter which method you choose, the best way to rid your yard of St. Augustine grass is to remain consistent with treatment and follow all safety guidelines when using chemicals or heavy machinery. With enough time and effort, you can soon have a lush green lawn without having to worry about pesky weeds and patchy grass!

Good luck!


  1. https://www.thesurvivalgardener.com/get-rid-st-augustine-grass-four-simple-ways/
  2. https://sodsolutions.com/lawn-care-guides/how-to-keep-st-augustine-out-of-empire-zoysia-lawns/
  3. https://www.gardenguides.com/112958-kill-st-augustine-grass.html
  4. https://www.ehow.com/how_5571666_kill-st-augustine-grass.html