Fertilizers

  • Amendments & Growing Media

    Amendments

    Soil Amendments & Growing MediaHealthy soil and growing media are the foundation...

    Amendments

  • BioStimulants

    BioStimulants

    Plant Biostimulants & Growth EnhancersBiostimulants are substances and microorganisms that improve plant...

    BioStimulants

  • YaraLiva CalciNit 15.5-0-0 greenhouse/solution grade 50 lb bag front label

    Specialty Crop Fertilizers

    Professional-Grade Fertilizers Formulated for Specialty Crops Give your plants the precise nutrition...

    Specialty Crop Fertilizers

  • Foliar Fertilizer Supplies

    Foliar Fertilizers & Spray Supplies

    Shop foliar fertilizers, soluble nutrients, biostimulants, and spray adjuvants for professional greenhouse,...

    Foliar Fertilizers & Spray Supplies

  • Liquid Fertilizers

    Liquid Fertilizers

    Blended Liquid Fertilizer ConcentratesLiquid fertilizer concentrates offer convenience and precision for hydroponic,...

    Liquid Fertilizers

  • Organic Fertilizers

    Organic Fertilizers

    Dry Organic & Natural Mineral FertilizersCustom Hydro stocks a full range of...

    Organic Fertilizers

  • Schedule Consultation

    Schedule Consultation

    Schedule a Fertilizer & Hydroponics ConsultationGet expert, one-on-one guidance from Custom Hydro...

    Schedule Consultation

  • Preservatives

    Stock Solution Preservatives

    Preservatives for Fertilizer Solutions & Hydroponic ReservoirsMicrobial contamination in fertilizer stock solutions...

    Stock Solution Preservatives

  • Water Soluble Fertilizers

    Water Soluble Fertilizers

    Shop water-soluble fertilizer ingredients and blended formulas for building a crop nutrition...

    Water Soluble Fertilizers

Shop water-soluble, liquid and organic fertilizers, amendments and biostimulants for commercial greenhouse, nursery, field and market-garden production. Find crop nutrition options for hydroponics, fertigation, foliar feeding and soil-based growing.

Browse the categories below by fertilizer type, crop or application. Compare nutrient analyses, fertilizer grades and package sizes on individual product pages, and choose products around your crop requirements, water quality and growing media. Organic-use listings, mixing guidance and application directions are product-specific.

  • Stik-Kote Spray Adjuvant - 1 qt Stik-Kote logo
    Stik-Kote Spray Adjuvant 1 qt
    Grower Price
    Stik-Kote Spray Adjuvant 1 qt
    $230.18
    $313.20 $230.18
    Grower Price
  • MasterBlend 4-18-38 Tomato Formula 4 lb. white screw-top jar with blue and white label on clean white background A closeup view of a small pile of MasterBlend 4-18-38 hydroponic tomato fertilizer powder.
    MasterBlend 4-18-38 Tomato Formula 4 lb.
    MasterBlend 4-18-38 Tomato Formula 4 lb.
    $15.65
    $0.00 $15.65
    $3.91 lb
  • REXOLIN Calcium EDTA fertilizer 55 lb.
    REXOLIN Calcium EDTA fertilizer 55 lb.
    Grower Price
    REXOLIN Calcium EDTA fertilizer 55 lb.
    $392.92
    $545.72 $392.92
    Grower Price
  • Solution Grade Gypsum 1 lb ziplock bag — calcium sulfate fertilizer by Custom Hydro Nutrients Calcium Sulfate, Solution Grade GYPSUM 1 lb.
    Solution Grade Gypsum 1 lb. | Calcium Sulfate
    Solution Grade Gypsum 1 lb. | Calcium Sulfate
    $2.75
    $0.00 $2.75
  • Haifa MAP 12-61-0 fertilizer
    Haifa MAP 12-61-0 fertilizer 55 lb. bag
    Sold out
    Haifa MAP 12-61-0 fertilizer 55 lb. bag
    $62.55
    $104.20 $62.55
    $1.14 lb
    Sold out
  • 13-0-0 Calcium Nitrate Fertilizer (ammonium free) 1 lb. PureCal 13-0-0 Ammonium-Free Calcium Nitrate Fertilizer | 1 lb Jar
    PureCal 13-0-0 Ammonium-Free Calcium Nitrate Fertilizer | 1...
    Sold out
    PureCal 13-0-0 Ammonium-Free Calcium Nitrate Fertilizer | 1...
    $2.28
    $0.00 $2.28
    Sold out
  • Hormodin No. 3
    Hormodin No. 3
    Grower Price
    Hormodin No. 3
    $32.25
    $48.50 $32.25
    Grower Price
  • Zinc EDTA 14% 8 ounces
    Zinc EDTA 15% 8 ounces
    Zinc EDTA 15% 8 ounces
    $10.75
    $0.00 $10.75
  • Zinc Nacional Maximo 360 zinc sulfate powder packaging on a white background Maximo 360 zinc sulfate powder
    Maximo 360 Zinc Sulfate Monohydrate | OMRI 50...
    Maximo 360 Zinc Sulfate Monohydrate | OMRI 50...
    $72.17
    $0.00 $72.17
  • Source Water Test
    Irrigation Source Water Lab Test
    Irrigation Source Water Lab Test
    $49.00
    $49.00
  • VanSil CS-1 wollastonite calcium silicate 20 lb brown kraft cardboard box VanSil Wollastonite Calcium Silicate 20 lb
    VanSil Wollastonite Calcium Silicate 20 lb
    VanSil Wollastonite Calcium Silicate 20 lb
    $18.70
    $0.00 $18.70
    $0.94 lb
  • 5-31-40 POLYPHOSPHATE FERTILIZER 4 lb.
    5-31-40 POLYPHOSPHATE FERTILIZER 4 lb.
    Sold out
    5-31-40 POLYPHOSPHATE FERTILIZER 4 lb.
    $23.90
    $0.00 $23.90
    Sold out
  • Zinc sulfate monohydrate 20 lb white resealable plastic pail with Custom Hydro Nutrients logo Zinc Sulfate fertilizer 20lb.
    Zinc Sulfate Monohydrate | 35.5% Zn 20 lb...
    Zinc Sulfate Monohydrate | 35.5% Zn 20 lb...
    $31.00
    $0.00 $31.00
  • Ammonium Sulfate 4 LB Ammonium Sulfate 4 LB
    Ammonium Sulfate 4 LB
    Ammonium Sulfate 4 LB
    $7.68
    $0.00 $7.68
  • Nature's Source 10-4-3 fertilizer 4.7 gallon
    Nature's Source 10-4-3 fertilizer 4.7 gallon
    Nature's Source 10-4-3 fertilizer 4.7 gallon
    $60.52
    $60.52
  • Monoammonium Phosphate 12-61-0 fertilizer 1 lb.
    Monoammonium Phosphate 12-61-0 fertilizer 1 lb.
    Monoammonium Phosphate 12-61-0 fertilizer 1 lb.
    $10.92
    $0.00 $10.92

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