Hydrogen Peroxide for seedlings

All the recipes for using hydrogen peroxide indoors for you seed starts and transplants.

Food Grade 3% Hydrogen Peroxide

Initial Soil Drench for Sterilizing & Germination
Soil Drench: 4 parts water and 1 part hydrogen peroxide

Managing Molds and Fungi
Spray: 6 parts water and 1 part hydrogen peroxide
Soil Drench: (maintaining health) 5 parts water and 1 part H202

Fungus Gnat Infestation
Spray: 4 parts water and 1 part hydrogen peroxide
Soil Drench: 3 parts water and 1 part H202

Kratky Method

Peroxide for Kratky Method
10 ml peroxide per gallon water


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Finding the right amount of hydrogen peroxide for your hydroponic system is crucial. Too little might not help, and too much could harm your plants.

  • Start small: Begin by adding a low dose of 3ml of 3% hydrogen peroxide solution per liter of water.
  • Watch closely: After you add hydrogen peroxide, observe your plants for any changes in health or growth.
  • Increase gradually: If there are no negative effects on the plants, slowly increase the dose while monitoring them.
  • Follow a schedule: For every gallon of water in your system, add 2-3 teaspoons of the solution. Do this every four days.
  • Adjust for size: Tailor the amount to fit the size of your hydroponics setup. Larger systems may require more hydrogen peroxide.
  • Use food grade: Always choose food-grade hydrogen peroxide for your plants. It’s safer and more effective for gardening use.
  • Be precise: Use a measuring tool to ensure you’re adding just the right quantity. Guessing can lead to over or under-dosing.
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Categorized as Garden