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Calnesium - Product Information

Crafted in 2015 to improve Calcium, Magnesium, and Iron availability, Calnesium is your go-to Calmag to prevent end rot in tomatoes and peppers. By preventing nutrient deficiencies, Calnesium promotes the development of sturdy cell walls, fostering healthier plant growth and enhancing yield potential.

Versatile and easy to mix, Calnesium complements your feed program as both a nutrient addition and a foliar spray. It is also the perfect partner to the Organic Calmag choice, Organical Magic, offering an organic alternative without compromise.

Compatible with any high-quality brand fertilizer, Calnesium excels when used alongside the comprehensive Future Harvest Nutrient Line, optimizing your plants' growth and yield potential.

Guy King on Aug 05, 2020

Great for tomatoes!

I have not one case of blossom rot on my tomatoes after using your magical Calnesium. This is the first year of perfect fruit! Thanks. I'll certainly be getting more next year after these results.

Directions for Use

For vigorous growth and optimal results, adhere to these guidelines:

    • 💧 Dilute: Use 2 ml per litre or 2 cc per quart of nutrient solution throughout your plants life.
    • 💧 Discontinue: using on the last week of flowering.

Growth Stage:

Vegetative, Flowering

For Use In:

Soil, Coco, Hydroponics


Every feeding until final stages of harvest, before flushing.

Key Features

  • ✔️ Inhibits blossom end rot by providing additional Calcium and enhancing nutrient uptake.
  • ✔️ Facilitates increased water, nutrient, and carbon dioxide uptake for optimal growth.
  • ✔️ Strengthens plant cells and tissues for greater resistance to stress.
  • ✔️ Promotes cell division and plant tissue development, supporting vital growth stages.
  • ✔️ Encourages more significant flower and fruit sets, enhancing yield potential.
  • ✔️ Boosts chlorophyll production for greener, healthier plants.

Minimum Guaranteed Analysis







Derived from: Calcium Nitrate, Calcium Chloride, Magnesium Nitrate, Iron EDTA, Zinc EDTA, Sodium Molybdate.


Compliance and Certifications

For those interested in the regulatory compliance and detailed composition of our product, we transparently provide all pertinent information. To verify our adherence to the rigorous standards set by the Oregon Department of Agriculture, please visit our certification page.

Furthermore, detailed information regarding the contents and levels of metals in Future Harvest products can be reviewed at the Association of American Plant Food Control Officials (AAPFCO) website.

Canadian customers can access our product’s compliance details with the Canadian Food Inspection Agency's regulations at their fertilizer database.

Future Harvest Nutrient Calculator

By entering your specific grow details, our Nutrient Calculator will outline the total amounts of Future Harvest products needed to take your plants from seeding to harvest, ensuring you're fully prepared for every stage of growth.