Organic Potassium Fertilizers
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Kelp (Seaweed) Organic Fertilizer
Introducing our Ferti-Organic Soluble Seaweed and Kelp Meal Fertilizer products - the...
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Organic Potassium Sulfate — OMRI Certified SOP
Organic Potassium Sulfate — OMRI Certified Sulfate of Potash for Organic Production...
Supercharge Your Crops with Organic Potassium
Custom Hydro carries a premium selection of OMRI-listed and naturally derived organic potassium fertilizers for farms, gardens, and hydroponic systems. Potassium drives fruit quality, water regulation, and overall crop resilience — our organic sources deliver it without synthetic inputs.
Organic Potassium Sources
- Kelp Meal
- Seaweed Extract
- Potassium Sulfate (SOP)
- Langbeinite (Sul-Po-Mag)
- Potassium Humates
All products are suitable for certified organic production. Fast nationwide shipping available.
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Protassium+ SOP 3IX 0-0-53 Potassium Sulfate 50 lbRegular price $60.98Regular priceUnit price $1.22 per lb$91.70Sale price $60.98Grower Price -
Ferti-Organic Soluble Seaweed Extract 0-0-14 - 50 lbRegular price $370.90Regular priceUnit price $7.42 per lb$568.40Sale price $370.90Grower Price -
Ferti-Corn Steep Powder 6-7-7 Organic NPK - 4...Regular price $19.68Regular priceUnit price $4.92 per lb
$0.00Sale price $19.68 -
Ferti-Organic Soluble Humic Acid 0-0-7 - 50 lbRegular price $196.27Regular priceUnit price $3.93 per lb$290.00Sale price $196.27Grower Price -
Ferti-Organic Soluble Humic Acid 0-0-7 - 4 lbRegular price $27.50Regular priceUnit price $6.88 per lb
$0.00Sale price $27.50 -
Ferti-Organic Soluble Seaweed Extract 0-0-14 - 4 lbRegular price $37.80Regular priceUnit price $9.45 per lb
$0.00Sale price $37.80 -
Protassium+ Organic SOP 0-0-50 Standard Fines | 50...Regular price $65.60Regular priceUnit price $1.31 per lb
$98.66Sale price $65.60Grower Price -
Ferti-Corn Steep Powder 6-7-7 Organic NPK - 50...Regular price $139.80Regular priceUnit price $2.80 per lb$210.25Sale price $139.80Grower Price -
Ferti-Organic Soluble Seaweed Extract 0-0-14 - 1 lbRegular price $10.80Regular priceUnit price $10.80 per lb
$0.00Sale price $10.80 -
Kelpak Liquid Seaweed Concentrate | 0-0-1Regular price From $98.95Regular priceUnit price per$160.00Sale price From $98.95Grower Price -
Ferti-Corn Steep Powder 6-7-7 Organic NPK - 20...Regular price $71.75Regular priceUnit price $3.59 per lb$100.00Sale price $71.75Grower Price -
Ferti-Organic Soluble Humic Acid 0-0-7 - 1 lbRegular price $12.00Regular priceUnit price $12.00 per lb
$0.00Sale price $12.00 -
Ferti-Organic Soluble Seaweed Extract 0-0-14 - 20 lbRegular price $143.40Regular priceUnit price $7.17 per lb
$0.00Sale price $143.40 -
Organic SOP 0-0-50 Standard Fines | 4 lbRegular price $15.45Regular priceUnit price per
$0.00Sale price $15.45 -
Ferti-Corn Steep Powder 6-7-7 Organic NPK - 1...Regular price $9.38Regular priceUnit price $9.38 per lb
$0.00Sale price $9.38 -
Acadian Organic Kelp Meal Fertilizer 1-0-2 - 50...Regular price $99.35Regular priceUnit price per$149.40Sale price $99.35Grower Price
Serving Arkansas, Kansas, Missouri and Oklahoma. Shipping Nationwide! Wholesale to the public!