The Andersons Home and Garden | Cal-Mag B Pro

Cal-Mag B Pro 4-0-0

Plant Supplement

  • Highly-fortified, professional grade plant supplement formulated to support your existing nutrient program
  • Contains calcium and magnesium to correct common nutrient deficiencies
  • Unique formula includes boron for stress and disease resistance
  • Iron to support the synthesis of chlorophyll
  • Can be applied as needed during all growing stages of hemp, vegetables, fruit and herbs
  • Can be used in all types of growing medium, including hydroponics, coco, soil and garden containers
  • Made in the USA
  • The Andersons Cal-Mag B Pro 4-0-0 is available in pallet quantities - there are 96 jugs per pallet


Cal-Mag B Pro 4-0-0 is a highly-fortified, professional grade plant supplement formulated with the ideal 3:1 calcium to magnesium ratio and micronutrients boron and iron. Designed to correct nutrient deficiencies and provide stress and disease resistance, this unique formula will also enhance nitrate processing and provide photosynthetic support ensuring beautiful, healthy plants. Cal-Mag B Pro can be applied as needed during all growing stages of hemp, vegetables, fruit and herbs.

Analysis 4-0-0 + Calcium, Iron, Boron, Magnesium
Package Sizes 1 Gallon

Shake well before each use. Use with every watering as needed. Mix well and adjust pH accordingly.

Add desired amount into water and mix well. Adjust pH accordingly. See label for hydroponic rates.

Apply 2 to 4 oz per 1,000 sq ft. At bud state, repeat in 7 to 10 day intervals.

Add 1 tbsp per 1 gal of water. Mix well and adjust pH to 6.2–7.0 before application.

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