Hydrogen peroxide (H₂O₂) is a powerful oxygen booster and disinfectant that helps improve plant health, kill harmful pathogens, and promote root growth. Since it contains an extra oxygen molecule (H₂O₂ vs. H₂O), it oxygenates the soil, which is crucial for strong root development.
Benefits of Hydrogen Peroxide for Plants
✅ Kills Fungal & Bacterial Infections – Helps prevent root rot, powdery mildew, and other plant diseases.
✅ Aerates the Soil – Improves oxygen levels, especially in compacted or overwatered soil.
✅ Boosts Root Growth – Promotes stronger root systems by increasing oxygen availability.
✅ Kills Pests – Deters aphids, spider mites, and fungus gnats.
✅ Seed Germination – Speeds up germination by softening seed coats and killing bacteria.
✅ Cleans Hydroponic Systems – Keeps hydroponic water clean and free from algae buildup.
How to Use Hydrogen Peroxide on Plants
Use 3% Hydrogen Peroxide (H₂O₂) Solution – Always dilute before applying!
1️⃣ Soil Drench (For Root Rot & Oxygen Boost)
Mix 1 tablespoon (15mL) of 3% H₂O₂ per 1 liter of water.
Water plants with this solution once a week to improve root health.
2️⃣ Foliar Spray (For Fungus & Pest Control)
Mix 1 teaspoon (5mL) of 3% H₂O₂ per 1 liter of water.
Spray on leaves to treat fungal infections and kill pests like aphids.
Apply in the morning or evening (avoid direct sun to prevent leaf burn).
3️⃣ Seed Germination Treatment
Soak seeds in 1 part 3% H₂O₂ + 2 parts water for 30 minutes before planting.
Rinse seeds with clean water and plant as usual.
4️⃣ Hydroponics & Watering System Cleaning
Use 1 teaspoon (5mL) of 3% H₂O₂ per liter of water to disinfect hydroponic systems.
Best Plants to Use Hydrogen Peroxide On
✅ Vegetables (Tomatoes, Peppers, Lettuce)
✅ Houseplants (Orchids, Pothos, Snake Plants)
✅ Hydroponic & Aquaponic Plants
Pro Tips:
✔️ Always test on a small area before applying to the whole plant.
✔️ Do not overuse – Too much H₂O₂ can damage beneficial microbes in the soil.
✔️ Store in a dark bottle as hydrogen peroxide breaks down in light.