Organic Fertilizers

  • Organic N-P-K fertilizer mixes collection — natural nitrogen phosphorus potassium blends for professional growers

    Organic N-P-K Fertilizer Mixes

    Organic N-P-K Fertilizer Mixes — Complete Nutrition from Natural SourcesShop our full...

    Organic N-P-K Fertilizer Mixes

  • Organic Micro Nutrients

    Organic Micro Nutrients

    Custom Hydro is your go-to source for all organic trace element fertilizers...

    Organic Micro Nutrients

  • Organic nitrogen fertilizers collection — natural and OMRI listed nitrogen sources for professional growers

    Organic Nitrogen Fertilizers

    Boost Your Crops with Organic Nitrogen FertilizersCustom Hydro carries a full selection...

    Organic Nitrogen Fertilizers

  • Organic phosphorus fertilizers collection — natural phosphorus sources for root development and professional growers

    Organic Phosphorus Fertilizers

    Give Your Soil the Phosphorus Boost It NeedsCustom Hydro stocks a comprehensive...

    Organic Phosphorus Fertilizers

  • Organic potassium fertilizers collection — natural potassium sources for fruit quality and professional crop production

    Organic Potassium Fertilizers

    Supercharge Your Crops with Organic PotassiumCustom Hydro carries a premium selection of...

    Organic Potassium Fertilizers

  • Organic calcium fertilizers collection — natural calcium sources for cell wall strength and professional horticulture

    Organic Calcium Fertilizers

    Build Stronger Plants with Organic CalciumCustom Hydro stocks a large selection of...

    Organic Calcium Fertilizers

  • Organic magnesium fertilizers collection — natural magnesium sources for chlorophyll production and professional growers

    Organic Magnesium Fertilizers

    Replenish Magnesium Naturally for Healthier PlantsCustom Hydro stocks a curated selection of...

    Organic Magnesium Fertilizers

  • Organic sulfur fertilizers collection — natural sulfur sources for protein synthesis and professional crop nutrition

    Organic Sulfur Fertilizers

    Give Your Farm the Sulfur It Needs — OrganicallyCustom Hydro carries a...

    Organic Sulfur Fertilizers

  • Organic silicon fertilizers collection — natural silicon sources for plant strength and stress resistance

    Organic Silicon Fertilizers

    Unlock Plant Health Benefits with Organic SiliconCustom Hydro carries a curated selection...

    Organic Silicon Fertilizers

  • Kelpak liquid seaweed concentrate - 2.5 gal

    Organic Specialty Crop Fertilizers

    Unlock Your Crop's Full Potential — OrganicallyCustom Hydro carries a premium selection...

    Organic Specialty Crop Fertilizers

Dry Organic & Natural Mineral Fertilizers

Custom Hydro stocks a full range of dry organic and natural mineral fertilizers for commercial specialty crop, vegetable, and greenhouse production. From OMRI-listed organic inputs to natural mineral sources, our selection supports both certified organic and conventional programs.

Product Categories

  • Organic nitrogen sources — feather meal, blood meal, soybean meal
  • Organic phosphorus sources — bone meal, rock phosphate
  • Organic potassium sources — kelp meal, greensand, sulfate of potash
  • Natural mineral fertilizers — gypsum, lime, dolomite
  • Slow-release fertilizers for custom media blends
  • OMRI-listed inputs for certified organic production

Key Features

  • OMRI-listed options for certified organic production
  • Slow-release and fast-release options available
  • Suitable for soil, raised bed, and container production
  • Bulk pricing available — contact us for wholesale quotes

Ideal Applications

  • Commercial specialty crop and hemp production
  • Vegetable and greenhouse crop production
  • Greenhouse and container growing
  • Custom soil and media blending
  • 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
  • Haifa BitterMAG Epsom Salt Fertilizer for Hydroponics. Haifa BitterMAG 50 lb. bag backside
    Haifa BitterMag Magnesium Sulfate 50 lb
    Grower Price
    Haifa BitterMag Magnesium Sulfate 50 lb
    $23.36
    $45.00 $23.36
    $0.47 lb
    Grower Price
  • Iron Sulfate Heptahydrate powder 50 lb.
    Iron Sulfate Heptahydrate powder 50 lb.
    Grower Price
    Iron Sulfate Heptahydrate powder 50 lb.
    $39.05
    $45.51 $39.05
    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
  • 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
  • Diamond K Premium 97 Powdered Gypsum - 50 lb Diamond K Solution Grade Gypsum sell sheet-1
    Diamond K Premium 97 Powdered Gypsum 50 lb.
    Grower Price
    Diamond K Premium 97 Powdered Gypsum 50 lb.
    $11.30
    $17.08 $11.30
    $0.23 lb
    Grower Price
  • K+S Magnesium Sulfate 50 lb.
    K+S Magnesium Sulfate 50 lb
    Sold out
    K+S Magnesium Sulfate 50 lb
    $36.85
    $47.25 $36.85
    Sold out
  • Manganese Sulfate Soluble Fertilizer Powder 55 lb. Tecmangam Manganese Sulfate Soluble Powder | 32% Mn 55 lb
    Tecmangam Manganese Sulfate Soluble Powder | 32% Mn...
    Grower Price
    Tecmangam Manganese Sulfate Soluble Powder | 32% Mn...
    $111.20
    $138.80 $111.20
    Grower Price
  • Ferti-Organic Soluble Seaweed Extract 0-0-14 - 20 lb Ferti-Organic Soluble Seaweed Extract 0-0-14 - 20 lb
    Ferti-Organic Soluble Seaweed Extract 0-0-14 - 20 lb
    Ferti-Organic Soluble Seaweed Extract 0-0-14 - 20 lb
    $143.40
    $0.00 $143.40
    $7.17 lb
  • 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
  • Potassium Sulfate STANDARD FINES 4 LB Organic SOP 0-0-50 Standard Fines | 4 lb
    Organic SOP 0-0-50 Standard Fines | 4 lb
    Organic SOP 0-0-50 Standard Fines | 4 lb
    $15.45
    $0.00 $15.45
  • Ferti-Corn Steep Powder 6-7-7 Organic NPK - 1 lb Ferti-Corn Steep Powder 6-7-7 Organic NPK - 1 lb
    Ferti-Corn Steep Powder 6-7-7 Organic NPK - 1...
    Ferti-Corn Steep Powder 6-7-7 Organic NPK - 1...
    $9.38
    $0.00 $9.38
    $9.38 lb
  • Iron Sulfate Heptahydrate 4 lb. jar
    Iron Sulfate Heptahydrate 4 lb. jar
    Iron Sulfate Heptahydrate 4 lb. jar
    $7.90
    $0.00 $7.90
  • Organic Kelp Meal Fertilizer 50 lb. Organic Kelp Meal Label.
    Kelp Meal Fertilizer 1-0-2 50 lb Bag
    Grower Price
    Kelp Meal Fertilizer 1-0-2 50 lb Bag
    $91.13
    $149.40 $91.13
    $1.82 lb
    Grower Price
  • Sil-MATRIX LC - Soluble Potassium Silicate 2.5 gallon Sil-MATRIX Potassium Silicate specification sheet page 1
    Sil-MATRIX LC Potassium Silicate 2.5 Gallon
    Grower Price
    Sil-MATRIX LC Potassium Silicate 2.5 Gallon
    $86.69
    $93.85 $86.69
    Grower Price
  • Maximo 361 Mini-Granule Zinc Sulfate | 35.5% Zn 50 lb Maximo 361 Mini-Granule Zinc Sulfate | 35.5% Zn 50 lb
    Maximo 361 Mini-Granule Zinc Sulfate | 35.5% Zn...
    Grower Price
    Maximo 361 Mini-Granule Zinc Sulfate | 35.5% Zn...
    $60.52
    $90.00 $60.52
    Grower Price

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