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Cannabis Plant Deficiencies

8 Key Signs Of Cannabis Plant Deficiencies

Growing cannabis plants is an all inclusive science with many technicalities. There are fixed climatic conditions and growing methods for marijuana. In order to achieve a healthy growth, you need to ensure that the seeds and the soil are of the best quality. Notwithstanding all precautions, oftentimes cannabis plants develop deficiencies and disorders. Here is a complete guide to all such conditions that can affect your marijuana plants and thus help you enjoy its varied health benefits.

Signs of Cannabis Plant Disorders

  1. Heat stress
  2. Immobile factors
  3. Mobile factors
  4. Ozone excess damage
  5. Over watering
  6. pH changes
  7. Nutrient Solution damage
  8. Nutrient deficiencies
Cannabis Plant Heat and Stress

Cannabis Plant Heat and Stress

  1. Heat Stress: A healthy plant will have fresh green leaves. If the edges are brown and dry, it indicates damage due to heat. It is difficult to differentiate it from nutrient burn. If the cause of the damage is heat, then only the top of the plant that is nearest to the lamp will be affected. The solution here is to move the plant or else change the position of the lamps so as to avoid direct heat. If the lamp cannot be moved higher, the only way to ensure safe growing is sowing dwarf (short-height) cannabis seeds.
  2. Immobile Plant Elements: Certain elements present within the plant can be the cause of plant damage. These signs are seen first on the young leaves of the plant and later on it spreads all over.
    • Sulphur: Sulphate carries out the main function of protein synthesis within the plant. It is also responsible for fatty acid metabolism and respiration in the plant. Deficiency of sulphur can make the leaves yellowish and curled. The plant is dull and lacks succulence. Its upper stems turn purplish and woody. If there is sulphur toxicity, then the leaves and the plant height will be stunted. The edges of the leaves will appear burnt.
    • Calcium: Calcium has the primary function of maintaining the cell structure and permeability of the membrane. A deficiency of calcium will make the root tip dry, cause curling of the leaf margins and also lead to marginal necrosis in the young leaves of the plant. In case of calcium excess, magnesium and potassium deficiencies may also occur.
    • Iron: Iron plays an important role in the plant system during photosynthesis. It is required for production of plant pigment, cholorophyll. If there is a deficiency of iron, then the leaves turns yellowish. The main reasons for iron deficiency are improper drainage, high pH and nematodes.
    • Manganese: This element is very essential for activation of enzymes and a deficiency could lead to necrosis of the leaves. High levels can make the leaves blotchy and slow down the growth.
    • Chlorine: If there is chlorine deficiency, the leaves get chlorotic and bronze coloured. The plant appears pale. Toxicity can lead to reduced leaf size and splitting of the leaves.
    • Boron: Lack of boron in the plant can make it brittle with swollen root tips. Boron toxicity will cause leaf necrosis and prematurely falling of the leaves.

    Other immobile plant elements that can lead to plant disorders are Molybdenum, Copper, Sodium, Silicon and Cobalt.

  3. Mobile Factors:
    • Nitrogen: Nitrogen is required by the plants but if it is added in excess it can delay the flowering process in the plant. Deficiency on the other hand will lead to a lax and weak plant.
    • Phosphorous: Deficiency of this vital element will be reflected in the plant as stunted groeth with purple pigmentation of the leaves.
    • Potassium: It plays an important role of maintaining water balance in the plant. Lack of potassium can lead to darkening of the leaves which then become dead.
  4. Ozone Excess Damage: Ozone damage is commonly seen in areas of the plant that are near the generator. The appearance of the plant is similar to the one in magnesium deficiency but the area of affection is limited.
  5. Over Watering: Giving excess water to the plant can also be harmful. The best way to tackle this problem is by establishing a drip system so that the plant can receive continuous water supply that is loaded with nutrients. If this set up is not feasible then watering of the plant should be done every 2-3 hours.
  6. pH Changes: If the pH levels within the plant are very high or low, then the nutrients can get locked up as undissolvable salts and complex compounds. These are toxic to the plant and result in abnormal growth. To correct this the grower tries to supplement with fertilizers which further cause damage to the plant by throwing the pH of balance.
  7. Nutrient Solution Damage: Nutrient solutions when applied to plants can cause harm if their EC concentration is very high. If the solution is applied while the plants are exposed to strong lamps, it can cause burns. When this occurs it means that the solution is in excess to the what the plant needs.
  8. Nutrient Deficiencies: If there is a calcium deficiency, the root of the plant will be short and thick. The plant as a whole will be brown or greyish in colour. Leaves will be pale and discolored.

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About the Author : Ruth Taylor

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