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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Kelp Meal Fertilizer 1-0-2 50 lb BagRegular price $91.13Regular priceUnit price $1.82 per lb$149.40Sale price $91.13Grower Price -
Sul-Po-Mag K-Mag Langbeinite Fertilizer 50 lbRegular price $41.25Regular priceUnit price per$62.00Sale price $41.25Grower Price -
Organic SOP 0-0-50 Standard Fines | 1 lbRegular price $7.40Regular priceUnit price per
$0.00Sale price $7.40 -
Organic SOP 0-0-50 Standard Fines | 20 lbRegular price $50.80Regular priceUnit price per
$0.00Sale price $50.80 -
Sulfate of Potash Ultra Fines | 0-0-50 |...Regular price $47.88Regular priceUnit price $0.96 per lb$53.20Sale price $47.88Grower Price -
AgriHusta Organic Liquid Fertilizer NPK 3-0-9 (Potassium Nitrate)...Regular price $67.00Regular priceUnit price $12.69 per gal
$109.84Sale price $67.00Grower Price -
Organic SOP 0-0-50 Standard Fines | 40 lbRegular price $80.91Regular priceUnit price per
$0.00Sale price $80.91 -
Sigma Biochar 5 micron Activated Biochar | 2.5...Regular price $149.63Regular priceUnit price $59.85 per gal
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Sigma K-Ferm Performance Fertilizer for Organic Production |...Regular price $253.05Regular priceUnit price $101.22 per gal
Serving Arkansas, Kansas, Missouri and Oklahoma. Shipping Nationwide! Wholesale to the public!