Your Cannabis plants may experience heat stress when exposed to too high temperatures. To save your Cannabis plants, you have to ensure adequate air circulation to your growing space. Make sure also to position your light accordingly that it receives appropriate lighting. Also, an exhaust system can control the heat of your growing area. It would be best if you also regulate your room temperature. Using ceramic pots can also help in cooling your Cannabis plants roots. Cultivating heat-resistant Cannabis plants can also help avoid the possibility of heat stress.
Cannabis heat stress happens when Cannabis plants are cultivated in temperatures too high for them to handle. Cannabis plants, despite their toughness, require a specific temperature to flourish. When the temperature is inappropriate, cannabis plants begin to exhibit various physiological symptoms or signs of stress, which are not helpful in any form. Heat stress can affect both indoor and outdoor cannabis plants. It might harm plant health and reduce your overall harvest in the end.
Varieties of factors may cause heat stress in your Cannabis plants. The following are the known causes of heat stress in your Cannabis plants:
Low Humidity in your Growing Space
Increased transpiration is one-way Cannabis tries to counteract stress in high temperatures naturally. It implies that water must be present in the surroundings and root zone of the plant for it to transpire. Transpiration becomes much more difficult in low-humidity environments.
Exposure to Extensive Light
Anyone who has put their plant too close to the grow light may have seen a stop in growth. It is because heat stress is likely to happen when your grow lights are too close to your cannabis plants. If this happen, your Cannabis plants may have bleaching around the tip. They can only withstand a particular amount of light intensity before becoming overburdened. To avoid this, check with the manufacturer of your light for recommended hanging heights.
Poor Ventilation
Poor levels of grow room extraction are a typical cause of cannabis heat stress. The significant ways to have good ventilation are removing heat and maintaining a consistent supply of fresh air for photosynthesis and respiration. Check to see if your extraction fan is sufficient for your grow tent and, if not, you have to upgrade.
Growers in hot climates should keep an eye on the outside temperature. If the temperature outside of your growing space is 95° Fahrenheit (35° Celsius), you will never achieve low temperatures no matter how robust your extractor fan is. All it will do is blow in hot air and worsening the issue. Air conditioning is the best alternative in these conditions.
To avoid heat stress in your Cannabis plants, you have to keep in mind the appropriate temperature of your growing space. During the day or lights on, keep the temperature between 75°-85° Fahrenheit (24°-29° Celsius). On the other hand, during dark cycles, regulate the temperature between 60°-75° Fahrenheit (16°-24° Celsius).
Mainly, cupped leaves, yellow or brown burnt spots, and foxtails are the common signs and symptoms of heat stress. Heat stress symptoms may vary in different stages, and the risk of heat stress varies with each growth stage. To understand better, the following are the heat stress symptoms in different growth cycles:
Heat Stress Symptoms in the Seedling Phase
Heat Stress Symptoms in the Vegetative Stage
Heat Stress Symptoms in the Flowering Stage
Indoor Cannabis Plants
Outdoor Cannabis Plants
There are several heat-resistant Cannabis strains that you can cultivate to avoid heat stress. These strains can better cope with hot and sunny areas. Keep in mind that even the most heat stress resistant strain can suffer from heat stress if the conditions are bad enough. The following are known heat-resistant Cannabis strains:
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