How To Kill Water Grass In Lawn

If you’ve ever noticed water grass in your lawn, you may have wondered how to kill water grass in lawn. This type of grass known as water grass, can wreak havoc on your lawn if left unchecked because they limit the growth of other plants and take over your yard.

In this article, we will explore the different types of water grass weeds, effective methods to kill them, and important tips to keep in mind for successful weed control. Read On!


What are Water Grass Weeds?

How To Kill Water Grass In Lawn
Picture of water grass

Water grass is a term used to describe various grasses that are considered weeds in lawns. These grasses can survive in wet and muddy environments, making them a common nuisance for homeowners. The most common water grass weeds are crabgrass and yellow nutsedge.


Types of Water Grass Weeds

  1. Crabgrass: Crabgrass (Digitaria spp.) is an annual grass that grows low to the ground and forms small clumps. It survives in warm summer weather and produces thousands of seeds that allow it to return each year. Crabgrass can easily be identified by its thick blades and is often found in cracks or spaces in sidewalks and along roadsides.
  2. Yellow Nutsedge: Yellow nutsedge (Cyperus esculentus) is technically a sedge rather than a grass. It is characterized by its “V”-shaped leaves and yellow flowers that eventually develop into seed heads. Yellow nutsedge has rhizomes that can grow over a foot deep into the ground, requiring management to control its spread.


Read alsoHow To Keep Grass Seeds From Washing Away


How To Kill Water Grass In Lawn

Identify the Weed Type

Before taking any action to kill water grass weeds, try to correctly identify the specific weed type in your lawn. Different weeds may require different treatment methods and herbicides. If you are unsure about the weed type, consider consulting an expert in agriculture or a local lawn care professional for guidance.

Consult an Expert

Seeking advice from an expert will benefit you when you are dealing with weed control. An authority on agriculture will provide valuable insights into the specific actions and herbicides that will work best for your lawn. They can recommend the most effective weed killer for your situation while ensuring the safety of your lawn and other plants.

Using Vinegar as a Natural Weed Killer

Vinegar can be an effective natural weed killer, including for watering grass weeds. Household vinegar is not good enough to effectively treat most weeds. Look for a vinegar-based weed killer solution, such as Green Gobbler, specifically designed to kill weeds without harming your lawn.

Apply the vinegar directly to the targeted weeds, taking care to avoid nearby grass and plants. Early fall is the ideal time to administer vinegar on the weeds directly.

Blocking Sunlight

Water grass weeds, like crabgrass, grow in environments with good sunlight. Blocking sunlight from reaching the weed can help prevent its growth.

One effective method is to tie a cloth over the weed and cover it with a bag to create a barrier. This prevents sunlight from reaching the weed and stops its growth. Be careful not to cover surrounding grass or plants with the cloth and bag.

Restricting Water Supply

As the name suggests, water grass weeds require a good amount of water to grow. Restricting the water supply in the area where there are weeds to help control its growth.

Avoid overwatering your lawn and ensure proper drainage to discourage the growth of water grass weeds. Also, be mindful of any irrigation systems or water sources that may contribute to an excess of water in the area.

Thoroughly Remove the Grass

To effectively get rid of water grass weeds completely, remove the grass thoroughly, including its roots. Dig up the grass, and make sure to get as much of the root system as possible.

However, be careful during the digging process to prevent the spread of weed seeds to neighboring areas. Dispose of the removed grass properly to prevent re-infestation.

Regular Fertilization and Reseeding

After removing water grass weeds, it is advised to replenish the area with new grass. Regularly fertilize the area and reseed it to promote the growth of healthy grass.

This helps fill in any gaps left by the removed weeds and prevents the growth of new weeds. Remember to follow proper lawn care practices to maintain a healthy and weed-free lawn.

Proper Herbicide Application

Herbicides can be effective tools for controlling water grass weeds, but they should be used with caution. Choose a herbicide specifically designed to kill the weed type in your lawn.

Follow the instructions on the herbicide label carefully, paying attention to the recommended application rates and safety precautions. Avoid mowing the lawn two days before and after herbicide application, and refrain from watering the treated area for at least a day or two.


Read also: How To Get Rid Of Grass Spiders


Important Considerations and Tips

Maintain Regular Lawn Care

Regular lawn care practices, such as mowing, watering, and fertilizing, are good for preventing the growth of water grass weeds.  maintaining a healthy lawn can help you create an environment that discourages weed growth.

Ensure that your lawn is mowed at the proper height, watered appropriately, and fertilized regularly to promote the growth of strong and dense grass.

Avoid Overwatering

Overwatering your lawn can create a favorable environment for the growth of water grass weeds. Ensure that your lawn’s watering schedule is appropriate for the specific grass type and climate in your area.

Avoid excessive watering that leads to waterlogged soil, as this can encourage the growth of weeds, including water grass.

Preventing Weed Spread

To prevent the spread of water grass weeds, take proactive measures. Regularly inspect your lawn for any signs of weed growth and promptly take action to control them.

Avoid using contaminated soil, seeds, or plants that may introduce weed seeds into your lawn. Additionally, practice proper lawn maintenance techniques, such as cleaning lawn equipment and removing weeds before they go to seed.


Read also: 12 Animals That Eat Grass


More on How To How To Kill Water Grass In Lawn

Here’s a video that explains How To Kill Water Grass In Lawn:



Water grass weeds can be a nuisance in any lawn, but with the right knowledge and methods, you can effectively control and eliminate them.

Correctly identifying the weed type, consulting experts, using appropriate herbicides, and following proper lawn care practices, will help you achieve a weed-free and healthy lawn.

Remember to be diligent and consistent in your weed control efforts to maintain a lush and beautiful lawn that is free from water grass weeds.

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