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Item Number: F2411

FoxFarm Cal-Mag (1 gal)

Immediately Available Calcium and Magnesium

Gringo Rasta® Cal-Mag from FoxFarm is designed to support strong plant structure and healthy yields by supplying two essential secondary nutrients—calcium and magnesium. These minerals play a vital role in strengthening cell walls, aiding in enzyme activity, and supporting fruit and flower development for a more productive garden.

Ideal for use in both soil-based and hydroponic systems, Cal-Mag helps prevent common nutrient deficiencies that can lead to issues like blossom end rot or poor bud formation. Its formula is OMRI Listed® and registered as a CDFA Organic Input Material, ensuring it’s suitable for certified organic growing. Containing 3% calcium and 0.9% magnesium, it’s derived from calcium carbonate, magnesium sulfate, and soy protein hydrolysate for efficient nutrient uptake.

Whether you’re growing vegetables, fruits, or flowering plants, this supplement can be a valuable part of your feeding program to promote overall plant vigor and resilience.

For more soil health and plant nutrition products, explore our Fertilizer & Growing Supplies collection.

  • Size: 1 gallon
  • Calcium Content: 3%
  • Magnesium Content: 0.9%
  • Suitable For: Soil and hydroponics
  • Organic Certification: OMRI Listed®, CDFA Organic Input
  • Derived From: Calcium carbonate, magnesium sulfate, soy protein hydrolysate
USDA Organicfoliar
Quantity Discounts for FoxFarm Cal-Mag (1 gal)
Buy 3 for $71.99 each
Buy 5 for $67.99 each
$79.99
Discount applied. Offer ends soon.
Next-day shipping available

Check Your Zone Compatibility:

Shipping Information

Ships from Northern CA.

Shipping Weight: 12.0 lb

Dimensions: 11.25"L x 6.75"W x 4.25"H

Features

    Characteristics

    Organic Status: Certified Organic Product
    Animal-Based : No
    Fertilizer Type : Prilled
    Major Nutrients : Calcium
    Major Nutrients : Magnesium
    Nutrient Release Rate : Immediate (0-1 Months)
    Use as Foliar : Yes
    Organic Certifier: OMRI, CDFA

    Use Instructions

    How to Use:
    • Shake well before using
    • Mix 1 tsp (5 ml) per gallon (4 L) of water

    Begin to use just before bud development. Continue use as needed, not more than once per week. Maintain a pH range of 5.6–6.8. A pH outside this range can affect the availability of calcium and magnesium.

    Useful Information

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