Organic Magnesium Fertilizers

Replenish Magnesium Naturally for Healthier Plants

Custom Hydro stocks a curated selection of OMRI-listed and naturally derived organic magnesium fertilizers for farms, gardens, and hydroponic systems. Magnesium is the central atom in chlorophyll — without it, plants cannot photosynthesize effectively. Our organic sources correct deficiencies without synthetic inputs.

Organic Magnesium Sources

  • Magnesium Sulfate (Epsom Salt) — fast-acting, water-soluble
  • Langbeinite (Sul-Po-Mag) — dual K + Mg source
  • Potassium Magnesium Sulfate (K-Mag) — granular slow-release
  • Solution Grade KMS — ideal for fertigation

All products are suitable for certified organic production. Fast nationwide shipping available.

  • Magnesium Sulfate 4 lb.
    Magnesium Sulfate 4 lb.
    Magnesium Sulfate 4 lb.
    $6.21
    $0.00 $6.21
    $1.55 lb
  • Magnesium Sulfate 40 lb. A pile of Magriculture magnesium sulfate heptahydrate rhombic crystals.
    Magnesium Sulfate Heptahydrate (Epsom Salt) - 40 lb
    Magnesium Sulfate Heptahydrate (Epsom Salt) - 40 lb
    $28.15
    $0.00 $28.15
    $0.70 lb
  • Haifa BitterMAG Epsom Salt Fertilizer for Hydroponics. Haifa BitterMAG 50 lb. bag backside
    Haifa BitterMag Magnesium Sulfate 50 lb
    Grower Price
    Haifa BitterMag Magnesium Sulfate 50 lb
    $23.36
    $45.00 $23.36
    $0.47 lb
    Grower Price
  • Sul-Po-Mag standard mini-granule 50 lb. sul-po-mag standard mini granule
    Sul-Po-Mag K-Mag Langbeinite Fertilizer 50 lb
    Grower Price
    Sul-Po-Mag K-Mag Langbeinite Fertilizer 50 lb
    $41.25
    $62.00 $41.25
    Grower Price
  • Giles Magriculture OMRI Organic Epsom Fertilizer full pallet Giles magnesium sulfate heptahydrate 50 lb bag Epsom salt
    Magriculture Magnesium Sulfate Full Pallet
    Grower Price
    Magriculture Magnesium Sulfate Full Pallet
    $1,224.27
    $1,469.02 $1,224.27
    Grower Price

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