DIY CalMag for Cannabis Plants

Before we get into the DIY CalMag recipe, we need to talk about what calcium and magnesium deficiencies look like. It is totally normal for a new grower to experience some sort of deficiency when they are starting out. Knowing the signs of common deficiencies is crucial in catching them early. Let’s talk about Calcium and Magnesium deficiencies.

Calcium Deficiency

Calcium is crucial for cell integrity and growth. It also helps with the flow of nitrogen and sugars throughout the plant. First symptom is curling and distortion of lower leaves. This is followed by yellow-brownish or brown spots with brown borders that grow over time. Finally, it will cause root tips to wither and die, which causes stunted plants with low yields.

Magnesium Deficiency

Magnesium is used in high volume during photosynthesis because magnesium is the central atom in the chlorophyll molecule. It is vital for absorption of energy from the light. Magnesium also aids enzymes in creating carbohydrates/sugars that produce flowers. Signs of a deficiency will not show until 3 to 6 weeks after it has started. It can quickly progress in flower and cause low yields. It will cause the areas between the veins to yellow on lower leaves. As it continues, it will move up the plant and the yellowing will increase and effect the margins and tips as well. The plant will look unhealthy, droopy and some leaves will curl, die and fall off.

Luckily, you can make a simple CalMag solution using egg shells, epsom salt and water. With a little time and a few supplies, you can make a DIY CalMag solution.

Here’s What You’ll Need:

  • 5-6 egg shells that have been dried out
  • 1 tbsp of plain epsom salt
  • 1 gallon of water (distilled, filtered or de-chlorinated)

How to Make DIY CalMag

  • Add 5-6 dry, crushed egg shells and 1 tbsp plain epsom salt to a gallon pot
  • Add a gallon of water
  • Boil the water until the epsom salt dissolves
  • Let it cool
  • Soak for 24 hours before putting in a container and using on your plants

How to Use DIY CalMag

  • Use 2 cups of the solution to water each plant
  • This recipe makes 8 treatments

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