How to Deal with Calcium Deficiency in Cannabis Plants

Cannabis plants depend on the intricate synergy of numerous compounds to guarantee healthy development. However, calcium deficiency cannabis can delay the vegetative period and reproductive development. Dealing with this kind of cannabis concern is essential in becoming an effective grower. The good thing for cultivators is that many of the cannabis deficiencies can be rectified, and that applies to calcium deficiency, too.

What is Calcium Deficiency Cannabis?

Calcium is an essential nutrient that facilitates providing formation to the cannabis plants and helps them endure stress such as those that are triggered by heat. It is an important element for good germination and early development of the root, right on the flowering period, and healthy maturity. 

Furthermore, calcium guarantees cell endurance and robust plant structure. It also keeps the healthy growth of the root, vitamin and protein structure, and the right intake of potassium. 

Once your plant experience calcium deficiency, the common indicator that you can find is bronze or brown blemishes or stains in the leaves. There are times that this condition would be hard to pinpoint since it is commonly drafted with iron, magnesium, and other types of deficiencies. Calcium progresses comparably slow through the different parts of the plant. It could imply that it is likely to stay after it has been supplied to a leaf. It is likely to occur on leaves that are vigorously growing and acquiring some volume of light. 

Commonly, calcium deficiencies occur in the following areas:

  • Upper leaves
  • Portions of fan leaves that are introduced to light

A calcium deficiency cannabis is less visible outdoors, contrary to hydroponic or impartial-medium indoor cultivations. Plants suffering from this condition are inhibited from consuming nutrients through the roots.

Common Symptoms of Calcium Deficiency

Calcium serves in agreement with other essential compounds to guarantee vitality and overall health. Insufficient calcium can imitate other kinds of deficiencies considering that the ability of the plant to keep the fundamental biological tasks is placed in jeopardy. 

Below are the common symptoms of calcium deficiency:

  • New growth on the upper part of the plant is mainly distressed
  • Young growth becomes stagnant, while new leaves swirl. New growth is contorted and quickly dwindles. Young shoots are either yellow or purple.
  • The root system is risked so lesser nutrients shall be consumed. Comprehensive development becomes sluggish and plants deplete its lustre.
  • The growth of flowers is extremely affected, particularly at peak florescence. Immature calyces are crumpled, gnarled, and do not gain weight. 
  • Big, slightly brown necrotic spots develop on leaves. You will also notice that the edges of the leaves dapple and become brown. The leaves will eventually turn yellow as the issue progresses. 
  • Branches are fragile and easily crack. You may also notice that the stalks turn ditch and decompose inside.
  • Cannabis plants are not doing well under heat.
  • Roots turn brown and become sensitive to the viscous root as well as other pathogens. 

Dealing with Calcium Deficiency in Cannabis Plants

Cannabis plants may demonstrate indications of calcium deficiency if the levels of pH in the roots are extremely high or extremely low. This is because if the pH in the root zone is off, the cannabis plants cannot appropriately penetrate calcium via its roots. Hence, the first thing to do is to make sure that you have the right pH for the medium.

After clearing up a calcium deficiency, the issue will stop occurring on new developments, typically within one week. Remember though that leaves that were affected by calcium deficiency may not recuperate or become green, thus, you may like to be on guard for new growth for indications of recovery.

If you think that your cannabis plants are going through calcium deficiency, drench the system with clean and pH’d water that has a typical dosage of cannabis-appropriate nutrients that comprises calcium. This will eliminate any traces of nutrient salts that could be affected the consumption of calcium and keep the restoration of pH to the right levels.

  • pH Levels in the Soil

Cannabis cultivators who are utilizing soil must maintain pH levels between the range of 6.0 and 7.0. However, calcium is best penetrated if the level is over 6.2, so maintain a pH level that is a little higher than the minimum requirement.

  • pH Levels in Hydroponics

Hydroponics setups must have a pH level that ranges from 6.2 to 6.5 to make sure that the calcium is thoroughly consumed by the roots. However, it is important that the system is decontaminated with clean water that has the right pH level. Doing so will help to restore the pH levels and scrape off any traces of nutrient salts that could trigger a concern when there are more nutrients supplemented.

The moment the pH levels are appropriately balanced more amount of calcium may be provided to the cannabis plants. 

  • Calcium Alternatives for Organic Growers

There are a few calcium options ideal for organic growth. You can try dolomite lime. You can also use seashells, fish bones, and smashed up eggshells as they can give more calcium to the cannabis plants through time.

If your cannabis plants will have excess calcium, the most effective thing to perform is to clear the system and entirely replace it with pH-balanced water. The roots must be rinsed carefully, if possible, to eliminate any nutrient leftover. Then the preferred quantity of calcium may be provided, as though beginning from the very start.

The moment calcium deficiencies in cannabis plants are dealt with successfully, the leaves along with the other parts must begin to display indications of recuperation in around 5 days.


Cannabis plants relish on calcium and will commonly penetrate and consume as much as it is provided. There are moments though that if plants can begin to turn calcium-deficient, specifically if cultivated hydroponically, or in any other setups that do not involve soil like the coco coir.

Just like any other kind of deficiencies, it is necessary that cultivators will always monitor their plants and make sure they are hearty, spirited, and thriving well. Doing so will make sure that a calcium deficiency cannabis is detected and dealt with immediately.

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