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.

  • Potassium Nitrate RECI, 4 lb. jar Haifa Multi-K RECI potassium nitrate fertilizer, 4 lb jar repack. Typical analysis: 13.5% nitrate nitrogen and 46.5% K₂O. Sodium: 150 ppm typical, 300 ppm maximum.
    Potassium Nitrate Fertilizer 4 lb – Haifa Multi-K...
    Grower Price
    Potassium Nitrate Fertilizer 4 lb – Haifa Multi-K...
    $15.18
    $32.00 $15.18
    Grower Price
  • Sulfate of Potash 0-0-51 Greenhouse Grade 4 lb. Sulfate of Potash 0-0-51 GG 4 lb.
    Sulfate of Potash 0-0-51 GG 4 lb.
    Sulfate of Potash 0-0-51 GG 4 lb.
    $13.82
    $0.00 $13.82
    $3.46 lb
  • Haifa Multi-K GG Potassium Nitrate Fertilizer – 55 lb Bag Haifa Multi-K GG Potassium Nitrate Fertilizer – 55 lb Bag
    Haifa Multi-K GG Potassium Nitrate Fertilizer – 55...
    Haifa Multi-K GG Potassium Nitrate Fertilizer – 55...
    $56.04
    $56.04
    $1.02 lb
  • Zinc EDTA chelate 15% Zn 4 lb white resealable screw-top jar with Custom Hydro Nutrients logo Zinc EDTA 14% 4 lb.
    Zinc EDTA Chelate | 15% Zn 4 lb
    Zinc EDTA Chelate | 15% Zn 4 lb
    $49.80
    $0.00 $49.80
    $12.45 lb
  • Solution Grade Gypsum 20 lb brown box — calcium sulfate fertilizer by Custom Hydro Nutrients Calcium Sulfate, Solution Grade GYPSUM 20 lb.
    Solution Grade Gypsum 20 lb. | Calcium Sulfate
    Solution Grade Gypsum 20 lb. | Calcium Sulfate
    $12.47
    $0.00 $12.47
    $0.62 lb
  • Urea 46-0-0 fertilizer low biuret 50 lb. Urea 46-0-0 fertilizer low biuret 50 lb.
    Urea 46-0-0 fertilizer low biuret 50 lb.
    Grower Price
    Urea 46-0-0 fertilizer low biuret 50 lb.
    $39.27
    $54.54 $39.27
    Grower Price
  • CalPhos soft rock phosphate granular 50 lb. brown kraft paper bag — 0-3-0 organic phosphorus and calcium by Canton Mills CalPhos soft rock phosphate GRANULAR 50 lb.
    CalPhos soft rock phosphate GRANULAR 50 lb.
    CalPhos soft rock phosphate GRANULAR 50 lb.
    $18.94
    $18.94
    $0.38 lb
  • CapSil Foliar Surfactant Comparison of water droplets spreading out on a textured blue surface treated with CapSil, a competitor product, and untreated.
    Aquatrols CapSil Nonionic Spray Adjuvant, 1 Gallon
    Grower Price
    Aquatrols CapSil Nonionic Spray Adjuvant, 1 Gallon
    $190.99
    $264.78 $190.99
    $1.49 oz
    Grower Price
  • Ferti-Corn Steep Powder 6-7-7 fertilizer 20 lb. Ferti-Corn Steep Powder 6-7-7 Organic NPK - 20 lb
    Ferti-Corn Steep Powder 6-7-7 Organic NPK - 20...
    Grower Price
    Ferti-Corn Steep Powder 6-7-7 Organic NPK - 20...
    $71.75
    $100.00 $71.75
    $3.59 lb
    Grower Price
  • SoluGreen 21-0-0 ammonium sulfate water soluble fertilizer 50 lb bag — American Plant Food Corp. SoluGreen ammonium sulfate crystals, 21-0-0 + 24% sulfur fertilizer — lowest heavy metal content
    SoluGreen Ammonium Sulfate 21-0-0 fertilizer 50 lb.
    Grower Price
    SoluGreen Ammonium Sulfate 21-0-0 fertilizer 50 lb.
    $30.27
    $59.62 $30.27
    $0.61 lb
    Grower Price
  • Copper sulfate fine crystals 25% Cu 1 lb resealable wide-mouth plastic container with Custom Hydro Nutrients logo Copper Sulfate fertilizer 1 lb.
    Copper Sulfate Fine Crystals | 25% Cu 1...
    Copper Sulfate Fine Crystals | 25% Cu 1...
    $10.15
    $0.00 $10.15
  • Haifa Multi-K RECI Potassium Nitrate Fertilizer – 55 lb Bag Haifa Multi-K RECI Potassium Nitrate Fertilizer – 55 lb Bag
    Haifa Multi-K RECI Potassium Nitrate Fertilizer – 55...
    Haifa Multi-K RECI Potassium Nitrate Fertilizer – 55...
    $58.24
    $58.24
    $1.06 lb
  • Sprint 330 10% Iron DTPA fertilizer 50 lb.
    Sprint 330 10% Iron DTPA fertilizer 50 lb.
    Sold out
    Sprint 330 10% Iron DTPA fertilizer 50 lb.
    $798.87
    $958.90 $798.87
    $15.98 lb
    Sold out
  • Calcium EDTA chelated 9.7% 4 lb. Calcium EDTA chelated 9.7% 4 lb.
    Calcium EDTA chelated 9.7% 4 lb.
    Calcium EDTA chelated 9.7% 4 lb.
    $42.00
    $0.00 $42.00
  • Bloom Formula 0-20-42 fertilizer 1 lb.
    MasterBlend 0-20-42 Bloom Formula 1 lb.
    Grower Price
    MasterBlend 0-20-42 Bloom Formula 1 lb.
    $8.52
    $16.99 $8.52
    $8.52 lb
    Grower Price
  • VanSil wollastonite calcium silicate 4 lb clear ziplock bag with white mineral granules VanSil Wollastonite Calcium Silicate 4 lb
    VanSil Wollastonite Calcium Silicate 4 lb
    VanSil Wollastonite Calcium Silicate 4 lb
    $7.45
    $0.00 $7.45
    $1.86 lb

Serving Arkansas, Kansas, Missouri and Oklahoma. Shipping Nationwide! Wholesale to the public!