Calcium Magnesium Nitrate

R69 - R965


Cal-Mag is a carefully formulated supplement that is used is commonly used to buffer coco peat bricks prior to planting. Buffering is a process whereby the growing medium is stabilized (getting rid of excess waste and supplementing useful nutrients,) in order to allow for easy uptake from the plant roots.



  • 33g/kg magnesium
  • 137g/kg nitrogen
  • 122g/kg Calcium
  • 2.1g/kg Boron
  • Group 1 Fertilizer - Registration: 2008/06722823


How to use

    To buffer a 5kg coco brick:

    • In a large container, mix 50g of CalMag with 20L of water until completely dissolved.
    • Soak washed coco brick in solution for 12 hours.
    • Drain excess water from expanded coco peat.
    • Rinse coco peat with pH balanced water.

    As a soil drench for Calcium or Magnesium deficiency:

    • Mix 1/2 teaspoon (2.5ml) per 5L of water until dissolved. 
    • Saturate growing medium with solution.
    • TIP: It is extremely unlikely to have a magnesium deficiency in soil.

    1L (approx. 1kg)