How Does Cornmeal Kill Weeds?

Oct 7, 2023

Welcome to Friendly Organics Canada, your go-to source for specialty food, health markets, and organic stores. In this article, we will explore the fascinating benefits of using cornmeal as a natural weed killer. If you are looking for effective and eco-friendly ways to control weeds in your garden, keep reading!

Understanding Cornmeal as a Weed Killer

Cornmeal, also known as corn gluten meal, is essentially a byproduct of corn processing. It is commonly used as a natural herbicide due to its weed-killing properties. Unlike chemical weed killers that may harm the environment and human health, cornmeal offers a safe and organic alternative.

How Does Cornmeal Work?

When used as a weed killer, cornmeal primarily targets the germination process of weeds. It acts as a pre-emergent herbicide, meaning it inhibits the growth of weed seeds before they can sprout and establish themselves in your garden. The secret lies in cornmeal's high nitrogen content.

Nitrogen is an essential nutrient for plant growth. However, the natural proteins found in cornmeal release a form of nitrogen that certain weed seeds find inhibitory. This nitrogen interferes with the root development of weeds, effectively preventing them from taking hold and growing.

Benefits of Using Cornmeal as a Weed Killer

There are several advantages to using cornmeal as a natural herbicide:

  • Environmentally Friendly: Unlike chemical herbicides, cornmeal poses minimal risks to the environment, animals, and beneficial insects. It provides a safe and sustainable approach to weed control.
  • Organic Gardening Companion: Cornmeal aligns perfectly with the principles of organic gardening, as it does not introduce harmful chemicals into the soil or surrounding ecosystem.
  • Cost-Effective: Cornmeal is often readily available at a reasonable price, making it a cost-effective option for large gardening areas.
  • Multiple Uses: Aside from effectively killing weeds, cornmeal also acts as a soil conditioner, providing nutrients to your plants and improving overall soil health.

How to Use Cornmeal to Control Weeds

Now that you understand the benefits of using cornmeal, let's explore how to effectively incorporate it into your weed control routine:

1. Selecting the Right Cornmeal

Make sure to choose cornmeal that is labeled as corn gluten meal, as it is specifically processed to act as a weed suppressant. This type of cornmeal is typically available at garden centers and online stores.

2. Preparation and Application

Follow these steps to apply cornmeal as a weed killer:

  1. Clear the Area: Remove any existing weeds manually or by using tools such as a garden hoe or trowel.
  2. Apply Cornmeal: Sprinkle a thin, even layer of cornmeal over the desired areas where you want to prevent weed growth. It's recommended to use approximately 20 pounds of cornmeal per 1,000 square feet.
  3. Water the Area: After applying cornmeal, gently water the area to activate the nitrogen release. Avoid overwatering, as it can dilute the herbicidal properties of cornmeal.

It's important to note that cornmeal is most effective when used as a preventive measure, rather than as a solution for established weeds. Regular reapplication may be necessary to maintain its weed-suppressing effects.


Cornmeal, with its natural weed-killing properties, offers an excellent alternative to chemical herbicides. By inhibiting weed seed germination through its high nitrogen content, cornmeal acts as a safe and organic option for weed control. At Friendly Organics Canada, we understand the importance of providing eco-friendly solutions for your gardening needs. Visit our specialty food, health markets, and organic stores to explore a wide range of products that help you maintain a healthy and sustainable garden.

does cornmeal kill weeds
Emil Basora
I didn't know cornmeal could be used as a weed killer! That's amazing! 🌽💪🌿
Nov 7, 2023
Veronica Cortez
Cornmeal: The Weed Assassin! 🌽👊
Oct 28, 2023
Ketan Patel
Who would have thought cornmeal could be our secret weapon against pesky weeds? 🌽🌿
Oct 17, 2023
Steve Casteel
Wow, I never knew cornmeal could kill weeds! 🌽🌿
Oct 9, 2023