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Compost Tea and Microbes

Compost tea, also known as compost extract or liquid compost, is a liquid solution made by steeping compost in water. This process releases beneficial microorganisms from the compost into the liquid, creating a rich source of microbes that can be used to promote healthy plant growth and soil biota.

The Role of Microbes in Compost Tea​

The microscopic world of microbes is essential for creating a thriving ecosystem in your garden or indoor plants. Beneficial microbes such as bacteria and fungi break down organic matter, making nutrients available to plants, suppressing plant pathogens, and improving the overall structure and fertility of the soil. By harnessing these beneficial microbes in compost tea, you can give your plants an added boost of health and resilience.

Preparing Compost Tea​

To make a high-quality compost tea, you'll need the following:

  • A bucket or container with a lid (at least 5-gallon capacity)
  • A drill with a large-diameter hole saw (for aeration)
  • Compost that is rich in beneficial microbes
  • Water
  • An aerator or air pump
  • A cheesecloth or fine-mesh sieve

First, fill the bucket with 1-2 gallons of water and add 1-2 cups of compost. Stir well to ensure even distribution. Then, cover the container with a lid and let it steep in a shaded area for 24-48 hours. This will allow the microbes to colonize the liquid.

Next, drill holes into the sides and bottom of the bucket for aeration. If you're using an air pump, attach it to the aerator according to the manufacturer's instructions. Turn on the air pump to introduce oxygen into the solution. Stir the compost tea occasionally throughout the steeping process to prevent stagnation and ensure even microbial colonization.

After the steeping period has passed, strain the liquid through cheesecloth or a fine-mesh sieve into another container. Discard the solids and use the liquid as compost tea for your plants.