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How To Fix Calcium Nutrient Deficiency in Cannabis Plants

How To Fix Calcium Nutrient Deficiency in Cannabis Plants

Cultivating cannabis is a rewarding journey, but sometimes something gets in the way of an abundant harvest. A common issue is calcium deficiency in cannabis plants and the final yield suffers significantly if you don’t detect it fast. We share why calcium is crucial for crops and how to fix calcium deficiency in cannabis plants.

Example of Cannabis Calcium Nutrient Deficiency

First, let’s talk about the need for calcium. Calcium is a vital nutrient to cannabis plants and is essential for optimal growth. This element plays a unique role in 

  • Maintaining the expansion and
  • The structural integrity of cell walls

It also plays a central part in intracellular signaling. Plants such as cannabis that require a robust structure to support a large mass of vegetative and fruiting growth will have a higher demand for calcium. Due to this demand, calcium is required throughout most of the growing cycle, from the beginning of the vegetative phase through to the end of the flowering phase.

How to know if your Cannabis Plants have a Calcium Nutrient Deficiency?

All plants require a calcium source. Whether it’s coming from your water source or your fertilizer program, calcium is an essential secondary nutrient. When it is lacking, there are some tell-tale signs that are specific to calcium:

  • Low growth rate
  • Variable patterns of chlorosis on young leaves
  • Upward curling of leaves
  • Browning/necrosis of apical meristems (growing points)

If you’d like a more visual reference to what it looks like, download our Cannabis Fertilizer Growers Handbook.

How to use Cal Kick Cannabis Fertilizer

Plant-Prod MJ Cal Kick cannabis fertilizer was created with a traditional high calcium NPK formulation in mind, that was enhanced to meet the high demands of cannabis production. These enhancements include elevated levels of iron and the addition of a second chelating agent – EDDHA. Since this formulation contains nitrogen, potassium and a complete micronutrient package, it is ideal for alternating or simultaneous feeding with other growth stage-specific formulations. 

Plant-Prod MJ Cal Kick cannabis fertilizer has a unique formulation that allows for this feeding without the risk of micronutrient deficiencies. Programs that rely on calcium nitrate fertilizer in Tank A do not have this option as the plants will be missing essential nutrients.

The micronutrient package allows for flexibility in feeding styles and ensures that at no point, are micronutrients deficient. Feeding rates should be based on water analysis to avoid overfeeding calcium. For more information on the A-B system and why this formulation cannot be mixed with others, see our previous post here.

The source of calcium in Cal Kick is calcium nitrate. This relatively reactive salt compound is frequently used to buffer coco growing media to replace potassium or sodium ions with calcium in cation exchange sites.

How to use Spike (CaMg) Cannabis Fertilizer

Plant-Prod MJ Spike (CaMg) was formulated to meet the needs of cannabis growers who desired to supplement calcium and magnesium without additional elements, such as nitrogen, sulphur or chloride. Spike (CaMg) contains chelated calcium and chelated magnesium, and nothing else.

It is intended to be used as a periodic supplemental source of calcium and magnesium, in addition to the standard 5 product Plant-Prod MJ program. Due to the lack of NPK and micronutrients, this product cannot substitute Cal Kick.

The source of calcium in Spike (CaMg) is EDTA chelated calcium. This metal complex is far less reactive to cation exchange sites than calcium nitrate and cannot be used in the same way to buffer coco media. The claw-like EDTA structure surrounding the calcium ion allows it to remain in solution and be more readily available for plant uptake.

Things to keep in mind when using Spike (CaMg) Cannabis Fertilizer

Plant-Prod MJ Spike (CaMg) is a unique product and should be used with the following in mind:

  • Use only as a supplemental feed at first sign of deficiency
  • Curb feeding to no more than twice a week, at low rates
  • Refrain from tank mixing with other Plant-Prod MJ formulations

For more cannabis fertilizer tips, check out these:  

Want to learn about improving your cannabis plant productivity? Download our Cannabis Fertilizer Growers Handbook and learn how to get 5X more buds with 80% less fertilizer.

Plant-Prod is a manufacturer of 100% water-soluble cannabis fertilizers made from the highest technical-grade raw materials in the world. The purity and consistency of Plant-Prod MJ fertilizers means there are no fillers left in the bottom of your tank or clogging your lines saving you the time and money to clean them out. And you get bigger, denser buds and faster growth on a more consistent basis.

The choice of growers from California to Maine for over 70 years, we formulate everything from chelated iron, to calcium nitrate and zinc fertilizer in order to help you get bigger buds for your buck. Click here to find a Plant-Prod cannabis fertilizer supplier near you.

Plant-Prod MJ is growing

Plant-Prod is pleased to announce a new addition to the Plant-Prod MJ product line, designed specifically for the cannabis industry – Plant-Prod MJ Spike (CaMg).

This new Spike (CaMg) fertilizer is made of exclusively chelated calcium (Ca) and chelated magnesium (Mg). Cannabis requires significant levels of Ca and Mg throughout the production cycle, especially during flowering and bud formation to ensure maximum yield.

The fact that this product is formulated with only chelates makes it truly unique. Chelated nutrients are far more accessible to plants and are immediately available to the roots. Most forms of Ca and Mg are either in sulfate, chloride or nitrate forms. Due to the high amount of Ca and Mg required, there is a greater chance of salt damage when using sulfate and chloride sources. In soilless media, many sulphate and chloride based nutrients are lost through leaching before they can become available to plants. When in the nitrate form, more nitrogen is provided to the system, compromising yield potential by confusing the cannabis plant. By adding excessive nitrogen at bud and flowering stages, plants will begin to grow vegetatively, shifting the plant’s focus from flowering to leaf and stem growth. Reducing overall yields.

Plant-Prod MJ Spike (CaMg) is formulated to give you the perfect ratio that cannabis plants need, 2 parts Ca to 1 part Mg, providing precise nutrition for maximum results.

Note that this product is not compatible with other Plant-Prod MJTM products. Please consult your Plant-Prod sales representative.

For full product information, see the Plant-Prod MJ Spike (CaMg) product page.

See how this formulation fits into our Plant-Prod MJ Production Program.



Legal notice for marijuana growers: The information provided by Master Plant-Prod Inc. is designed for ethical, government sanctioned medical marijuana grow operations. Master Plant-Prod does not encourage nor condone operations that are unlawful. All operations should adhere to the laws in the jurisdictions in which they operate. Full legal statement here.