Heat Stress

Heat stress in cannabis refers to the physiological strain experienced by the plant when exposed to excessive temperatures that exceed its optimal growth threshold. Typically, cannabis plants thrive in environments with temperatures ranging from 70-85°F (20-30°C). Once ambient temperatures surpass this range, the risk of heat stress escalates, leading to various symptoms that can hinder plant development and yield.

Symptoms of Heat Stress

Symptoms of heat stress in cannabis plants include wilting, curling, or upward folding of leaves, commonly known as “tacoing.” The foliage may display yellowing or browning edges and discolored patches due to the breakdown of chlorophyll, diminishing the plant’s ability to conduct photosynthesis efficiently.

Prolonged exposure to high temperatures can also cause stunted growth, root damage, reduced terpene and cannabinoid profiles, and poor bud development.

How Does Heat Retention Contribute to Heat Stress?

Heat retention techniques can contribute to heat stress by trapping heat close to the body, making it difficult for the body to cool down. This can lead to increased internal temperature, dehydration, and exhaustion. Proper ventilation and cooling methods are essential to prevent heat-related illnesses in hot environments.

Mitigating Heat Stress

To mitigate heat stress, growers must monitor and regulate grow room temperatures and humidity levels diligently. Effective strategies include employing climate control systems such as air conditioning, exhaust fans, and evaporative coolers, as well as optimizing light schedules to avoid peak heat periods.

Ensuring adequate watering and implementing heat-resistant plant genetics are also vital measures in protecting cannabis plants from the detrimental effects of high-temperature environments. Regular observation and prompt adjustments are key to preserving plant health and maximizing cannabis crop productivity.