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
  • Iron Sulfate Heptahydrate 1 lb.
    Iron Sulfate Heptahydrate 1 lb.
    Iron Sulfate Heptahydrate 1 lb.
    $4.75
    $0.00 $4.75
  • Pastille 99% Elem Sulfur - 50 lb Pastille 99% Elem Sulfur - 50 lb
    Pastille 99% Elem Sulfur - 50 lb
    Grower Price
    Pastille 99% Elem Sulfur - 50 lb
    $32.10
    $48.24 $32.10
    Grower Price
  • Penoles Magnesium Sulfate 50 lb.
    Peñoles Magnesium Sulfate 50 lb
    Grower Price
    Peñoles Magnesium Sulfate 50 lb
    $30.51
    $45.88 $30.51
    Grower Price
  • Yellow Jacket 90% Wettable Sulfur II fungicide and miticide 50 lb bag for organic agriculture Yellow Jacket Wettable Sulfur II is a yellow finely ground powder for easy dispersion and suspension.
    Yellow Jacket 90% Wettable Sulfur II Fungicide &...
    Grower Price
    Yellow Jacket 90% Wettable Sulfur II Fungicide &...
    $51.40
    $84.22 $51.40
    $1.03 lb
    Grower Price
  • Azomite 44 lb. bag
    Azomite 44 lb. bag
    Grower Price
    Azomite 44 lb. bag
    $39.75
    $45.95 $39.75
    Grower Price
  • Potassium Sulfate STANDARD FINES 1 LB Soluble Organic Potassium Sulfate fertilizer
    Organic SOP 0-0-50 Standard Fines | 1 lb
    Organic SOP 0-0-50 Standard Fines | 1 lb
    $7.40
    $0.00 $7.40
  • Roots Organic Terp Tea Bloom 40 lb. bag of organic cannabis fertilizer. Roots Organics Terp Tea Bloom 40lb
    Roots Organics Terp Tea Bloom 40 lb
    Grower Price
    Roots Organics Terp Tea Bloom 40 lb
    $100.23
    $156.59 $100.23
    $2.51 lb
    Grower Price
  • Algamin Kelp Meal Maxicrop 5 lb.
    Algamin Kelp Meal Maxicrop 5 lb.
    Grower Price
    Algamin Kelp Meal Maxicrop 5 lb.
    $16.51
    $19.49 $16.51
    Grower Price
  • Nature's Source 3-1-1 Organic Fertilizer 4.7 gallon
    Nature's Source 3-1-1 Organic Fertilizer 4.7 gallon
    Grower Price
    Nature's Source 3-1-1 Organic Fertilizer 4.7 gallon
    $64.10
    $80.00 $64.10
    Grower Price
  • A 40 lb bag of Roots Organics Terp Tea Grow fertilizer. Roots Organics Terp Tea Grow 40lb
    Roots Organics Terp Tea Grow 40 lb
    Grower Price
    Roots Organics Terp Tea Grow 40 lb
    $95.80
    $156.59 $95.80
    Grower Price
  • Iron Sulfate Hi Yield 4 lb.
    Iron Sulfate Hi Yield 4 lb.
    Grower Price
    Iron Sulfate Hi Yield 4 lb.
    $10.30
    $15.00 $10.30
    Grower Price
  • Phos Sea Bird Guano Powder 40 lbs
    Roots Organics Seabird Guano Powder 40 lb
    Grower Price
    Roots Organics Seabird Guano Powder 40 lb
    $53.87
    $80.99 $53.87
    Grower Price
  • Azomite 4 lb.
    Azomite 4 lb.
    Azomite 4 lb.
    $8.10
    $0.00 $8.10
  • Maximo 363 Granular Zinc Sulfate | 35.5% Zn 50 lb Maximo 363 Granular Zinc Sulfate | 35.5% Zn 50 lb
    Maximo 363 Granular Zinc Sulfate | 35.5% Zn...
    Maximo 363 Granular Zinc Sulfate | 35.5% Zn...
    $81.80
    $81.80
    $1.64 lb
  • Potassium Sulfate STANDARD FINES 20 LB Organic SOP 0-0-50 Standard Fines | 20 lb
    Organic SOP 0-0-50 Standard Fines | 20 lb
    Organic SOP 0-0-50 Standard Fines | 20 lb
    $50.80
    $0.00 $50.80
  • Sigma 5-3-2 Bio With Value-Added Biologicals Sigma 5-3-2 Bio Organic Fertilizer 50 lb
    Sigma 5-3-2 Bio Organic Fertilizer 50 lb
    Grower Price
    Sigma 5-3-2 Bio Organic Fertilizer 50 lb
    $25.71
    $38.66 $25.71
    Grower Price

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