Nitrogen deficiency is a common issue in cannabis cultivation. Hydrogen, oxygen and carbon are considered macronutrients but we will not be discussing these here as we assume your plants have enough air and water. Macronutrients are minerals heavily consumed by a plant, and micronutrients are trace nutrients used in very small quantities. These can be split into two categories: macronutrients and micronutrients. Now, let's go over some of the minerals you might encounter when facing a nutrient deficiency. Depending on what you buy, make sure the EC of your solution stays more or less between these levels to avoid deficiencies or toxicities: Store bought nutrient solutions for cannabis are often heavily concentrated meaning most growers dilute them to avoid over feeding (which can lead to nutrient lock outs).Īdding nutrients to your tap water increases its electrical conductivity so it might be that a deficiency occurs because the concentration is too high. Normally EC is checked to avoid giving plants a high concentration of minerals but it can also be useful to get an idea of how much plants are consuming. Measuring the EC or PPM won't tell you exactly what mineral your cannabis plants are deficient in, but it will give you a good indication as to the strength of your water and feeding solution.
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Related story How to Grow Cannabis in Hydroponics Electrical Conductivity (EC)ĮC (electrical conductivity) and PPM (parts per million) measures the salt concentration of water or a nutrient solution. In soil the minerals have medium to absorb into, whereas in hydro the exchange is happening directly between the water and the roots. This is due to the cation exchange and how roots uptake minerals in different mediums. If the pH level falls out the correct range the different nutrients will start to become locked out.įor soil cultivation, the ideal pH range is between 6 and 7, whereas for hydroponics cannabis grows best with a pH of around 5.8. The pH will determine how effectively certain minerals are delivered from the roots to the plant. Whether you are growing in soil or hydro, the acidity or alkalinity of your grow medium is extremely important for proper nutrient absorption. However, there are a few other factors which can help explain why your cannabis plant might be suffering from a lack of nutrition. If plants are receiving a good amount of sunlight and water, it is quite likely the problem is to do with the nutrient levels. Why is my Cannabis Plant Deficient?Ĭannabis plants can become deficient at any point in their life. Immobile nutrient deficiencies can stunt a plants development more severely because plants have to work harder to search and deliver the nutrition to the new leaves. The problem with this is that plants begin to use fresh minerals being sent to the new foliage growth. Once stored in a cannabis plant, they cannot be redistributed and do not move. Immobile nutrients are not readily available to plants like mobile nutrients are. If you've ever noticed, this is why cannabis plants yellow from bottom to top towards the end of their life cycle as they use up their remaining mobile minerals. This means that the required mineral will be sent from the stores in the older fan leaves to support new growth. In the event of a deficiency, mobile nutrients can be transferred from the leaves to other leaves that need it more. These minerals can be distinguished by how they are able to move from their storage point to other areas of the plant. Understanding the difference between mobile and immobile nutrients makes it easier to diagnose a deficiency in a cannabis plant. Even if a cannabis plant is growing well, monitoring leaves daily means deficiencies can be detected early before they become too serious. It is quite easy to tell when there is a problem because the leaves will not look normal to you.
These signs are typically spotted through the plant's leaves.Ī healthy cannabis plant has the natural green colour and appearance you would expect it to. Any problems and the plant will let us know through different physical changes. A thriving marijuana plant does not require much other than sunlight, air, water and some nutrients.
Normally when we think about a cannabis plant we imagine big frosty buds surrounded by bushy, lush green leaves.
This guide will help you diagnose any possible nutrient deficiencies in your cannabis plants. The good news is there is always a quick way to resolve most nutrient deficiencies, providing they are treated properly. It is not uncommon for cannabis plants to come across some type of deficiency during their life cycle.
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