Organic Calcium Fertilizers
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Amino Acid Chelated Calcium
Boost Crops with Amino Acid Complexed Calcium Achieve higher crop yields than...
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Crab Shell Meal Fertilizer
Get High Calcium Crab Shell Fertilizers Today! Give your garden a nutritional...
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Dolomite Lime
Dolomite Lime, fine grade, contains 20% calcium and 10% magnesium. It serves...
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Solution Grade Calcium Sulfate Gypsum
Solution grade calcium sulfate gypsum is a fully soluble, finely milled calcium...
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Pure Calcitic Limestone
Calcitic limestone is calcium carbonate, and it neutralizes acids in the growing...
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Soft Rock Phosphate
Soft Rock Phosphate FertilizerCalPhos soft rock phosphate is a natural, untreated colloidal...
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Wollastonite Calcium Silicate
VanSil Wollastonite — Natural Calcium Silicate for PlantsVANSIL wollastonite is the only...
Build Stronger Plants with Organic Calcium
Custom Hydro stocks a large selection of OMRI-listed and naturally derived organic calcium fertilizers for farms, gardens, and hydroponic systems. Calcium is critical for cell wall integrity, nutrient uptake, and preventing disorders like blossom end rot — our organic sources deliver it without synthetic inputs.
Organic Calcium Sources
- Amino Acid Chelated Calcium
- Calcium Silicate (Wollastonite)
- Calcium Sulfate (Gypsum)
- Calcium Carbonate (Limestone)
- Calcium Phosphate (Soft Rock Phosphate)
All products are suitable for certified organic production. Fast nationwide shipping available.
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ACG Valu-Fil 650 Solution Grade Gypsum 50 lb.Regular price $14.56Regular priceUnit price $0.29 per lb$21.90Sale price $14.56Grower Price -
Solution Grade Gypsum 4 lb. | Calcium SulfateRegular price $3.50Regular priceUnit price $0.88 per lb
$0.00Sale price $3.50 -
Solution Grade Gypsum 20 lb. | Calcium SulfateRegular price $12.47Regular priceUnit price $0.62 per lb
$0.00Sale price $12.47 -
VanSil CS-1 Wollastonite Calcium Silicate 50 lbRegular price $27.38Regular priceUnit price $0.55 per lb$41.07Sale price $27.38Grower Price -
VanSil Wollastonite Calcium Silicate 4 lbRegular price $7.45Regular priceUnit price $1.86 per lb
$0.00Sale price $7.45 -
Diamond K Premium 97 Powdered Gypsum 50 lb.Regular price $11.30Regular priceUnit price $0.23 per lb$17.08Sale price $11.30Grower Price -
Solution Grade Gypsum 1 lb. | Calcium SulfateRegular price $2.75Regular priceUnit price per
$0.00Sale price $2.75 -
VanSil Wollastonite Calcium Silicate 20 lbRegular price $18.70Regular priceUnit price $0.94 per lb
$0.00Sale price $18.70 -
VanSil Wollastonite Calcium Silicate 1 lbRegular price $5.20Regular priceUnit price $5.20 per lb
$0.00Sale price $5.20 -
Sigma 5-3-2 Bio Organic Fertilizer 50 lbRegular price $25.71Regular priceUnit price per$38.66Sale price $25.71Grower Price -
Sigma 4-4-4 Bio Fine Grade With Value-Added Biologicals...Regular price $30.06Regular priceUnit price $0.60 per lb
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Organic Bone MealRegular price From $7.75Regular priceUnit price $1.94 per lb
$0.00Sale price From $7.75 -
Sigma 6-2-6 Bio Fine With Value-Added Biologicals |...Regular price $38.68Regular priceUnit price $0.77 per lb
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Sigma 2-4-2 Bio With Value-Added Biologicals | 50...Regular price $26.20Regular priceUnit price $0.52 per lb
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Roots Organics Super Phos Rock, 55 lbsRegular price $94.80Regular priceUnit price per$142.55Sale price $94.80Grower Price -
AGRIHUSTA LIQUID CALCIUM-NITRATE FERTILIZER NPK 3-0-0 +Ca (5...Regular price $95.00Regular priceUnit price per
$125.00Sale price $95.00Grower Price
Serving Arkansas, Kansas, Missouri and Oklahoma. Shipping Nationwide! Wholesale to the public!