Does Cornmeal Kill Weeds?

Nov 1, 2023

Welcome to the informative article about the effectiveness of cornmeal as a weed killer. At Friendly Organics Canada, we strive to provide you with the best solutions for your organic gardening needs.

The Power of Cornmeal as a Weed Killer

Are you tired of battling stubborn weeds in your garden? Look no further, as cornmeal might just be the solution you've been searching for! Many gardeners wonder if cornmeal can effectively kill weeds, and we are here to shed some light on this natural weed control method.

Understanding How Cornmeal Works

Cornmeal, derived from the grinding of corn kernels, contains a substance called corn gluten meal (CGM). CGM is rich in nitrogen, making it an excellent natural fertilizer. However, it also has weed-inhibiting properties that can prevent weed seeds from germinating.

The weed-suppressing effects of cornmeal are due to the presence of proteins in CGM. These proteins act as weed seed germination inhibitors, effectively stopping weeds from growing. By applying cornmeal to your soil, you create an unfavorable environment for weed seeds to prosper.

How to Use Cornmeal for Weed Control

Using cornmeal as a weed killer is a simple process that can save you time and effort in long-term weed management. Here's how you can effectively use cornmeal in your garden:

  1. Preparation: Before applying cornmeal, remove any existing weeds and clear the area you wish to treat.
  2. Application: Sprinkle a thin layer of cornmeal over the soil, making sure to cover the entire area where weed suppression is desired. Be careful not to apply too much, as excess cornmeal can attract critters.
  3. Watering: After applying the cornmeal, gently water the area to activate its weed-inhibiting properties. This ensures that the cornmeal makes direct contact with the soil and weed seeds.
  4. Maintenance: Reapply cornmeal every four to six weeks, or after heavy rains, to maintain its effectiveness as a weed killer.

The Benefits of Using Cornmeal as a Weed Killer

Choosing cornmeal as a natural weed control method offers several advantages:

  • Organic Solution: Cornmeal is an organic alternative to synthetic herbicides, making it safe for your garden and the environment.
  • Natural Fertilizer: The nitrogen content in cornmeal helps nourish your soil and promotes healthy plant growth.
  • Long-Term Prevention: Cornmeal's weed-inhibiting properties prevent weed seeds from germinating, reducing the need for constant weeding.
  • Cost-Effective: Cornmeal is a cost-effective solution compared to other commercial weed killers on the market.
  • Suitable for Organic Gardening: If you follow organic gardening practices, cornmeal aligns perfectly with your principles and maintains the integrity of your organic garden.

Points to Consider

While cornmeal can effectively inhibit weed growth, it is important to note that it may not eradicate existing mature weeds. Cornmeal primarily focuses on preventing the germination of new weed seeds. For the best weed control results, combining cornmeal application with manual weeding or using mulch is recommended.


In conclusion, cornmeal can be an excellent tool for weed control, providing a natural and organic solution for your gardening needs. Friendly Organics Canada recommends cornmeal as an effective weed-inhibitor that can be easily incorporated into your organic gardening practices. By using cornmeal, you not only suppress weeds but also promote the overall health and vitality of your plants and soil.

Now that you're armed with the knowledge of how cornmeal can kill weeds effectively, it's time to put this natural weed control method to the test in your own garden. Enjoy a weed-free oasis while contributing to a healthier environment!

does cornmeal kill weeds