Grow More produces professional-grade, water-soluble fertilizers that cover every stage of pepper development, from seedling through fruit ripening. This guide explains which formulations to use when, how to mix and dilute them, and how application approach differs between containers, greenhouses, and field beds.

Quick Reference

  • Seedlings: 20-20-20 at 1/4–1/2 tsp/gal, weekly or bi-weekly
  • Vegetative: 30-10-10 at 1 tsp/gal weekly
  • Pre-bloom: switch to 10-55-10 as branching starts
  • Fruit fill: 5-10-40 every 7–10 days through ripening
  • Never mix calcium nitrate with phosphates in the same tank

Pepper Nutrient Needs by Growth Stage

Pepper plants shift their nutrient priorities at each stage. Seedlings need mild, balanced nutrition. During vegetative growth, nitrogen drives leaf and stem development. At the transition to flowering, phosphorus and potassium become the focus. During fruit fill and ripening, potassium supports size, flavor, and color development. Matching your fertilizer to the stage is more important than any single product choice.

Grow More Products for Peppers

Product (N-P-K) Best Used During Nutrient Emphasis Application Notes
20-20-20 Seedling & Transplant Balanced all-purpose Use at 1/4–1/2 tsp/gal weekly or bi-weekly.
30-10-10 Early Vegetative High Nitrogen Stimulates leaf growth in early stage. Avoid overuse.
10-55-10 Pre-bloom / Flower Initiation High Phosphorus Used before and at the start of flowering.
0-50-30 Flowering / Early Fruiting Extreme P-K Boost Powerful bloom booster. Use cautiously.
5-10-40 Fruit Fill & Ripening High Potassium Supports large, flavorful fruit. Use every 7–10 days.
6-30-30 Bloom Support High P-K Use during peak flower and early fruit set.
Seaweed Extract All stages Micronutrients & Hormones Improves stress tolerance and overall vigor.
Calcium Nitrate Fruit Set Calcium & Nitrate N Prevents blossom end rot. Use as supplement.
Iron Chelate 6% As needed Iron (Fe) Corrects yellowing from iron deficiency.
Magnesium Sulfate As needed Magnesium + Sulfur Supports chlorophyll and enzyme function.

Mixing and Dilution

Start seedlings at 1/4 tsp per gallon of 20-20-20. For vegetative growth, use 1 tsp/gal of 30-10-10 weekly. Switch to bloom formulations (10-55-10 or 0-50-30) once the plant starts branching or shows pre-flower buds. Transition to 5-10-40 or 6-30-30 at fruit set, and continue through ripening. Always dissolve powders completely before applying. Flush every 3–4 weeks to prevent salt buildup, especially in closed container systems. For foliar feeding, dilute to 1/4–1/2 strength and apply at dusk or dawn when evaporation rates are low.

Compatibility and Nutrient Management

Most Grow More products combine well with each other and common supplements. Seaweed extract and calcium nitrate can both be added alongside nutrient mixes, but do not combine calcium nitrate with phosphates in the same tank—they precipitate. Iron chelate and magnesium sulfate work best as corrective foliar applications. Always test solution pH and target 5.8–6.5 for best uptake.

Application by Growing Style

Containers: Flush with plain water every two weeks. Feed at lower concentrations more frequently—weekly beats bi-weekly in pots.

Greenhouses: Monitor EC regularly. Mix in large batches and pre-dissolve powders before adding to reservoirs.

Field and garden beds: Water deeply after feeding to drive nutrients into the root zone and prevent foliage burn. Add compost tea or organic matter to support soil biology alongside synthetic feeding.

Grower’s Takeaway

  • The biggest leverage point is switching from high-N to high-P/K at first flower—most growers wait too long
  • Calcium nitrate and phosphates must be kept in separate tanks
  • Flush containers every 3–4 weeks; accumulated salts quietly reduce uptake
  • Foliar iron chelate and magnesium sulfate work faster than soil application for correcting deficiencies

Sources & Further Reading

  • Priest, C.T., and D.J. Austin. The Chile Pepper Almanac. Harambe Publishing, 2026. Amazon