Herbicides will kill grass, but many people are worried about the environmental impact herbicides may have. New research shows that glyphosate, a popular herbicide may cause health problems for people, as well. The International Agency for Research on Cancer (IARC) has classified glyphosate as probably causing cancer, although the EPA states it is safe when used according to the label directions. Boiling water is an alternative to herbicides that is very popular. The question, then, is, “Will boiling water kill grass?” Read on for the answer.
Will Boiling Water Kill Grass?
Yes, boiling water will kill your grass. In fact, it kills any plant that it contacts. Of course, you have to be careful when using it or you will get burned by the water, too.
What Is Boiling Water?
Water is made of two hydrogen atoms and one oxygen atom. Unless it is distilled, water also contains trace minerals. Water boils at 212F at sea level. This is hot enough to cause severe burns.
What Does Boiling Water Do To Grass?
Boiling water destroys the leaves and roots of grass by overheating them, causing the plant cells to collapse and sending the plant into shock. For young grass, one application usually kills the grass. For larger plants, you will probably have to retreat it 7-10 days later to completely kill the grass. This treatment is best used on plants growing in cracks in walkways and driveways. The boiling water will kill any other plants it touches, so you need to be careful not to get it on them.
Two common questions when using boiling water are, “Will boiling water kill grassroots?” and “Will boiling water kill grass seeds?” The answer to both is yes. The water kills the root and seeds by overheating them and causing the cells to collapse.
Related Article: What Kills Grass? A Guide to Harmful Substances
How to Use Boiling Water to Kill Your Grass
You will need a large pot and a propane burner. The water will start to cool as soon as you remove it from the burner. This means you will not be able to boil water inside and carry it outside to use in killing grass. It will be too cool to work by the time you get to the grass. Follow the steps below to do this the most effective way.
- Mow or clip the grass short.
- Put a large pot full of water on a burner (propane or electric).
- When it is in a rolling boil, use potholders to carry the water to the grass you want to kill.
- Pour the boiling water on the grass.
If the grass puts out new leaves, treat it again with more boiling water to finish it off.
The water will burn you as well as the plants. Wear closed-toed shoes, long pants, and long sleeves to do this so if the water spatters or spills on you, you will be less likely to be burned by it. A tea kettle is easier to pour than a large pot, but you have to heat it more often than when using a pot because it is smaller.
Does Boiling Water Kill The Soil Microbes?
Yes, boiling water kills everything in the soil, including the microbes and any invertebrates, such as earthworms, it touches. However, soil microbes reproduce so fast that they will soon recolonize the empty spot. It will take longer for the invertebrates to return, but the soil should be full of life again in four weeks or so.
How Do I Treat Boiling Water Spills On Grass?
If you accidentally spill boiling water on your grass, it will most likely kill the leaves. You can quickly flush the area with cool water to lower the temperature of the water as it reaches the roots. Although the plant parts above the ground will die, if the roots are spared they will put out new leaves. This can take as much as two weeks, so be patient. If the grass does die, remove the dead grass. The surrounding grass will grow over the bare area in about four weeks if it is small. Larger bare spots will take longer to cover, but will eventually be full of grass again.
In conclusion, the answer to our original question, “Will Boiling Water Kill Grass?” is a yes. Boiling water will kill grass, kill grass seeds, and sterilize the soil. To completely kill grass may take a second application, but the grass will die. The heat from the boiling water collapses the cells in the grass, destroying them. While it isn’t practical to kill a whole lawn with boiling water, it works well when removing grass from walkways and driveways.