How to Use the Fertilizer Dilution Calculator
Fertilizer that's too strong damages roots, while too weak has little effect. The right concentration depends on growth stage — seedlings with weak roots do best starting at a light 1:1000 ratio, actively growing plants use a standard 1:500 ratio, and flowering or fruiting plants benefit from a slightly stronger 1:300 mix. Pick your growth stage and enter the water volume you're using to get the exact fertilizer amount needed.
Dilution Ratios by Growth Stage
| Growth Stage | Ratio | Notes |
|---|---|---|
| Seedling | 1:1000 | Light, protects young roots |
| Growing | 1:500 | Standard, supports active growth |
| Flowering / Fruiting | 1:300 | Stronger, boosts phosphorus/potassium |
Frequently Asked Questions
Seedlings have weak roots that fertilizer burn easily, so a lighter mix is safer. Growing plants need standard strength, and flowering or fruiting stages benefit from a slightly stronger mix to support nutrient uptake.
Osmotic pressure can pull water out of roots, scorching leaves or wilting the plant (fertilizer burn). Always follow the recommended ratio, and start lighter if unsure.