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

  • Organic cannabis fertilizers collection — natural nutrients for cannabis cultivation and professional hydroponic growers

    Organic Cannabis Fertilizers

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

    Organic Cannabis Fertilizers

Dry Organic & Natural Mineral Fertilizers

Custom Hydro stocks a full range of dry organic and natural mineral fertilizers for commercial cannabis, vegetable, and specialty crop 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 cannabis and hemp production
  • Vegetable and specialty crop production
  • Greenhouse and container growing
  • Custom soil and media blending
  • Magriculture Magnesium Sulfate 50 lb. bag. A pile of Magriculture magnesium sulfate heptahydrate rhombic crystals.
    Magriculture Magnesium Sulfate Heptahydrate 50 lb
    Best Price
    Magriculture Magnesium Sulfate Heptahydrate 50 lb
    $26.30
    $41.64 $26.30
    $0.53 lb
    Best Price
  • Protassium+ 3IX 0-0-53 fertilizer 50 lb. Pile of white SOP 3IX 0-0-53 fertilizer powder on a white background
    Protassium+ SOP 3IX 0-0-53 Potassium Sulfate 50 lb
    Best Price
    Protassium+ SOP 3IX 0-0-53 Potassium Sulfate 50 lb
    $60.98
    $91.70 $60.98
    $1.22 lb
    Best Price
  • Soluble Seaweed Extract 0-0-14 fertilizer 50 lb. Ferti-Organic Soluble Seaweed Extract Fertilizer 0-0-14 | 50 lb.
    Ferti-Organic Soluble Seaweed Extract Fertilizer 0-0-14 | 50...
    Best Price
    Ferti-Organic Soluble Seaweed Extract Fertilizer 0-0-14 | 50...
    $377.99
    $568.40 $377.99
    $7.56 lb
    Best Price
  • Ferti-Corn Steep Powder 6-7-7 fertilizer 4 lb. Ferti-Corn Steep Powder 6-7-7 fertilizer 4 lb.
    Ferti-Corn Steep Powder 6-7-7 fertilizer 4 lb.
    Ferti-Corn Steep Powder 6-7-7 fertilizer 4 lb.
    $19.68
    $0.00 $19.68
    $4.92 lb
  • Soluble Fulvic Acid 1 lb.
    Soluble Fulvic Acid 1 lb.
    Soluble Fulvic Acid 1 lb.
    $13.40
    $0.00 $13.40
    $13.40 lb
  • Ferti-Nitro Plus 13.62-0-0 Organic Fertilizer 50 lb. Ferti-Nitro Plus Organic Nitrogen Fertilizer 13.62-0-0 | 50 lb.
    Ferti-Nitro Plus Organic Nitrogen Fertilizer 13.62-0-0 | 50...
    Best Price
    Ferti-Nitro Plus Organic Nitrogen Fertilizer 13.62-0-0 | 50...
    $321.93
    $401.80 $321.93
    $6.44 lb
    Best Price
  • Solution Grade GYPSUM 50 lb. Solution Grade GYPSUM 50 lb.
    Solution Grade GYPSUM 50 lb.
    Best Price
    Solution Grade GYPSUM 50 lb.
    $14.56
    $21.90 $14.56
    $0.29 lb
    Best Price
  • Soluble Fulvic Acid 4 lb.
    Soluble Fulvic Acid 4 lb.
    Soluble Fulvic Acid 4 lb.
    $31.15
    $0.00 $31.15
    $7.79 lb
  • Ferti-Organic Soluble Fulvic Acid 50 lb. Ferti-Organic Soluble Fulvic Acid 69% OMRI Listed | 50 lb.
    Ferti-Organic Soluble Fulvic Acid 69% OMRI Listed |...
    Best Price
    Ferti-Organic Soluble Fulvic Acid 69% OMRI Listed |...
    $218.95
    $304.10 $218.95
    $4.38 lb
    Best Price
  • Ferti-Nitro Plus 1lb. Jar Ferti-Nitro Plus 1lb v2
    Ferti-Nitro Plus 1 lb.
    Ferti-Nitro Plus 1 lb.
    $16.22
    $0.00 $16.22
    $16.22 lb
  • Soluble Seaweed Fertilizer 0-0-14, 4 lb.
    Soluble Seaweed Fertilizer 0-0-14, 4 lb.
    Soluble Seaweed Fertilizer 0-0-14, 4 lb.
    $37.80
    $0.00 $37.80
    $9.45 lb
  • CalPhos POWDER 50 lb. CalPhos POWDER 50 lb.
    CalPhos POWDER 50 lb.
    Best Price
    CalPhos POWDER 50 lb.
    $17.99
    $27.00 $17.99
    $0.36 lb
    Best Price
  • Organic SOP 0-0-50 STANDARD FINES 50lb. Protassium organic standard fines logo
    Protassium+ Organic SOP 0-0-50 Standard Fines | 50...
    Best Price
    Protassium+ Organic SOP 0-0-50 Standard Fines | 50...
    $65.60
    $98.66 $65.60
    $1.31 lb
    Best Price
  • Ferti-Corn Steep Powder 6-7-7 fertilizer 50lb. Ferti-Corn Steep Powder Organic Fertilizer 6-7-7 | 50 lb.
    Ferti-Corn Steep Powder Organic Fertilizer 6-7-7 | 50...
    Best Price
    Ferti-Corn Steep Powder Organic Fertilizer 6-7-7 | 50...
    $139.80
    $210.25 $139.80
    $2.80 lb
    Best Price
  • Soluble Seaweed Fertilizer 0-0-14, 1 lb.
    Soluble Seaweed Fertilizer 0-0-14, 1 lb.
    Soluble Seaweed Fertilizer 0-0-14, 1 lb.
    $10.80
    $0.00 $10.80
    $10.80 lb
  • Kelpak liquid seaweed concentrate - 2.5 gal Kelpak cold cellburst process kelp extract.
    Kelpak Liquid Seaweed Concentrate | 0-0-1
    Best Price
    Kelpak Liquid Seaweed Concentrate | 0-0-1
    From $98.95
    $160.00 From $98.95
    Best Price

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