- Make a mixture of one teaspoon hydrated lime to four litres of water and water in.
- Use a commercial calcium booster or liquid lime.
A calcium deficiency in cannabis plants is less common in outdoor soil grows than hydroponic or neutral-medium indoor grows. A calcium deficiency will:
- New growth at the top of the plant is primarily affected.
- Young growth slows, new leaves curl. Fresh growth is twisted and dies off quickly. Young shoots are purple or yellow.
- The root system is compromised so fewer nutrients will be absorbed. Overall growth slows and plants lose their lustre.
- Flower growth severely affected, especially at peak florescence. Young calyces are crinkled, distorted and don’t fill out.
- Large, light brown necrotic spots form on leaves. Leaf edges mottle and turn brown. Leaves become yellow as the problem advances.
- Branches are weak and break easily. Stalks may become hollow and rot inside.
- Plants do not respond well to heat.
- Roots become brown and are susceptible to slimy root rot and other pathogens.
The following represent symptoms of a calcium deficiency:
Calcium acts in concert with other important compounds to ensure overall plant health and vitality. A lack of calcium can mimic other deficiencies since the plant’s ability to maintain essential biological functions is compromised.
If your water is 150ppm (EC 0.3), then there is little risk of calcium deficiency. Using unmodified RO or distilled water can strip calcium from plants. Before making a nutrient solution, add two parts calcium to one part magnesium to the water until the ppm reading is at least 150-200 (EC 0.3-0.4).
Tomatoes are another plant notorious for their calcium demands. An old gardener’s trick is to dig a hole deeper than what is needed for the transplant. Put two fish heads and a palmful of garden lime in the bottom and water in. Backfill with soil, then plant the seedling as normal. Your plants will boom, then bloom.
Calcium is an essential compound used to aid plant growth all throughout its life. It is necessary for proper germination and early root development, right on through to flowering and healthy maturation. Calcium helps ensure cell vitality and strong plant formation. It also helps maintain healthy root growth, protein and vitamin synthesis and the proper absorption of potassium.
- Inhibit nutrient uptake at the roots. Calcium aids in the decomposition of organic matter at the root zone, facilitating nutrient absorption.
- Impede flower growth during peak florescence. Cannabis uses extra calcium in the middle of the flowering process. Depending on species, this can be from three to six weeks into flowering.
- Cause nutrient lockout. Poor functioning roots means poor nutrient uptake. The plant may display several types of nutrient problems when this happens.
- Cause plants to lose vitality and wilt. Calcium is essential for general plant health and stress resistance.
Calcium deficiency in cannabis can slow growth and inhibit flowering. Find out how to identify and fix calcium deficiencies for indoor and outdoor grows.
To control the calcium deficiency we can perform foliar applications of Ca with a Ph of 7.2 directly on the affected leaves. We can also add calcium and magnesium to the nutrient solution, increasing the initial EC value in 0.2 points during about five days.
First symptoms of Ca deficiency
Deficiencies can normally be more present in hydroponic crops due to the use of inert substrates (coco-coir, clay pebbles, rock wool, mapito. ) or when we don’t use substrate, as is the case of aeroponic systems.
- The youngest leaves of the plant are the first to be visibly affected
- The growth of the upper part of the plant is slowed down
- The root system is also affected, what reduces nutrient uptake
- As the deficiency progresses, the youngest leaves turn yellowish and become deformed
- Bud development is seriously reduced
Calcium is an element that is directly related to the transpiration of plants. This transpiration control comes, in essence, from the roots and the stomata, which are located on the leaves. It can happen that the stomata are closed by an excess of heat, causing a superficial burn which could be confused with a symptom of calcium deficiency.
Calcium is a very important secondary nutrient given the large amount of this element that the plant needs during its entire life cycle. From the very beginning, and already in the seed germination stage, calcium takes direct part in root development and protein synthesis. It’s absorbed by the roots in the form of Ca++ ion.
Fertilisers for marijuana plants already contain the necessary micro-elements for the life of the plant, but there are nutrients such as calcium or magnesium which should be present in higher concentrations – especially at the early stages – to ensure that marijuana plants have everything they need to develop properly.
As we have already mentioned, if you are using osmosis water for watering your plants you should add calcium and magnesium before adding fertilisers to the nutrient solution. Since osmosis water doesn’t contain any nutrients, your initial EC value will always be 0.0.
The role of calcium in cannabis plants
In this post we show you how to identify calcium deficiency in your plants. This nutrient imbalance is difficult to detect, so you must pay close atte