MasterBlend Hydroponic Fertilizers

Choose MasterBlend water-soluble fertilizers by crop and nutrient program, then select the package size for your operation. Start with the 25 lb Lettuce, Tomato or Bloom bags below for ongoing production, or choose smaller Tomato and Bloom sizes for smaller batches.

Find your 25 lb formula

• MasterBlend 8-15-36 Lettuce Formula, 25 lb: a hydroponic base for lettuce and leafy-green production.
• MasterBlend 4-18-38 Tomato Formula, 25 lb: for tomatoes and other fruiting vegetables, used in a multi-part program.
• MasterBlend 0-20-42 Bloom Formula, 25 lb: a nitrogen-free analysis for bloom-stage nutrient programs, not a complete standalone feed.

Complete the program, not just the bag

The fertilizer listings contain the named formula only, not a three-part kit. Review YaraLiva CalciNit 15.5-0-0 and Magriculture magnesium sulfate heptahydrate alongside your selected formula. These inputs are sold separately. The calcium nitrate products shown in this collection are companion nutrients, not MasterBlend-branded formulas; different nitrogen analyses require recalculation rather than gram-for-gram substitution.

Compare sizes and other formulas

Tomato 4-18-38 and Bloom 0-20-42 are also available in 1 lb and 4 lb sizes. For repeated mixing or larger operations, compare these with the corresponding 25 lb bag. The collection also includes 9-12-34 Strawberry Formula and 0-12-24 Bloom Formula. The two Bloom analyses are different formulas, not interchangeable application rates.

Plan before mixing

Match the formula and companion inputs to the applicable manufacturer directions, crop stage and source-water analysis. Use measured EC and pH to evaluate the mixed solution rather than assuming a universal dose. The manufacturer's Tomato Formula mixing chart is specific to 4-18-38; do not automatically apply it to Lettuce or Bloom formulas.