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How to Make Compost Tea

easyGardening24-48 hours9 steps

Safety Warnings

  • Use high-quality, well-composted organic matter to avoid introducing pathogens to plants.

Tools Needed

Bucket or Barrel — Large capacity, preferably plastic or food-grade
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Aerator/Pump — Air stone or aquarium pump (for aerated tea)
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Strainer/Mesh Bag — Fine mesh or porous fabric to hold compost
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Materials

Finished Compost — High-quality, nutrient-rich organic compost(2-4 cups)
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Water — Chlorine-free or declorinated(5 gallons)
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Molasses — Unsulphured (optional, to feed microbes)(1-2 tablespoons)
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Steps

1
Fill a large bucket or barrel with chlorine-free water.
Tip: If using tap water, let it sit for 24 hours to allow chlorine to evaporate.
2
Place finished compost into a mesh bag or strainer.
Tip: This prevents compost particles from clogging sprayers.
3
Submerge the compost bag into the water.
Tip: Ensure the bag is fully immersed for maximum nutrient extraction.
4
Add molasses to the mixture to stimulate microbial growth.
Tip: Use unsulphured molasses to avoid harming beneficial bacteria.
5
Begin aeration using an air pump and air stone.
Tip: Consistent oxygenation prevents the tea from becoming anaerobic and smelling foul.
6
Let the tea brew for 24 to 48 hours.
Tip: The liquid should look like dark coffee and may develop a foam on top.
7
Remove the compost bag from the liquid.
Tip: The spent compost can be added directly to the garden soil.
8
Dilute the concentrated tea with water if necessary.
Tip: A common ratio is 1 part tea to 10 parts water for foliage application.
9
Apply the tea to the base of plants or spray it on foliage.
Tip: Foliar application helps prevent certain fungal diseases.

Pro Tips

  • Always use a fresh batch of compost for the best microbial activity.
  • Avoid using the tea in direct, scorching sunlight to prevent burning leaves.
  • Use the tea immediately after brewing for maximum effectiveness.

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Sources

Synthesized from 10 verified sources:

Gutenberg: Farm Gardening GuideView →
Gutenberg: Manual of GardeningView →
Wind River Greens Plant DatabaseView →
GrowstuffView →
Old Farmer's AlmanacView →
Old Farmer's AlmanacView →
Gutenberg: War Gardens GuideView →
Wind River Greens Plant DatabaseView →
Wind River Greens Plant DatabaseView →
Wind River Greens Plant DatabaseView →