Temperature Stress

Temperature stress in cannabis plants refers to the adverse physiological and biochemical reactions that occur when the plants are exposed to temperatures outside their optimal growth range. Cannabis thrives best in a moderate climate, with ideal temperatures for vegetative growth around 70-85°F (20-30°C), and slightly cooler temperatures for the flowering phase, approximately 65-80°F (18-26°C).

When temperatures deviate significantly from these ranges, the plant experiences stress which can lead to a variety of symptoms and long-term growth issues.

High Temperature Stress

High temperature stress can lead to issues such as wilting, leaf curling or canoeing, and in severe cases, can reduce photosynthetic efficiency, resulting in stunted growth and poor yield. Excessive heat can also exacerbate transpiration, the process by which water evaporates from plant leaves, potentially leading to dehydration despite adequate soil moisture.

Heat stress might also increase susceptibility to pests and diseases as the plant’s natural defense mechanisms become compromised.

Low Temperature Stress

Conversely, low temperature stress can slow down metabolic processes, including those related to nutrient uptake and photosynthesis, leading to subdued growth and delayed flowering. Frost or extremely chilly conditions can damage the plant tissue, making the plant more prone to diseases, and in extreme scenarios, result in plant death.

Temperature stress, therefore, is a critical factor for growers to monitor and manage to ensure the health and productivity of their cannabis plants. Balancing ambient temperatures and employing strategies to mitigate temperature fluctuations are indispensable for cultivating high-quality cannabis.