Just like humans, cannabis plants should not be left to bake in intense heat and light. Indoor gardens are highly susceptible to light burn, which happens when plants are placed too close to powerful grow lights. Heat stress and light burn typically go hand in hand.
Symptoms of light burn usually appear on plant tops, as leaves become brown, yellow, or spotted. The leaves’ middle veins may stay green, as light burn gradually moves inward. Light burn does not occur in outdoor gardens because sunlight works differently. However, when THC or CBD cannabis plants are moved outdoors after living under artificial lighting, they may exhibit signs of light burn.
When fighting light burn, light intensity and heat are two of the most important considerations. If buds and leaves exhibit trouble signs, simply move the lights away or replace bulbs with less potent ones. Indoor gardens should be kept at about 77 degrees Fahrenheit with plenty of air circulation.
Growers should regularly check the buds and leaves closest to the grow lights. Buying weaker lights for use during the flowering stage is a good choice because that’s when light burn usually occurs. Ensuring proper air circulation and grow room temperature is another smart move.
Just as we do, cannabis plants like the occasional cool breeze. However, if winds get a little too intense, the plants will show signs of stress which are known as windburn. This is a common problem in indoor grows where space limitations place fans in unnatural positions. The issue is rare outside because wind patterns eventually stabilize.
Windburn is an easy issue to identify because of the inner workings of an indoor grow op. If plant leaves close to the fan develop droopy, curly claws, windburn is likely to blame. Additionally, when fans are pointed right at plants, or when leaves are flapping vigorously, airflow may be too strong.
The simplest way to fight windburn is to position fans well and to use the right settings. Because cannabis branches and stems are strengthened by gradual airflow, leaves and plants should move gently rather than quickly. Air from fans should be directed between the canopy and the grow lights, and the fan itself should oscillate. Some growers have seen success when placing a small fan that generates a gentle vertical breeze.
To minimize the risk of windburn, plan the grow operation before planting the seeds. Windburn typically occurs when a grower tries to put too many cannabis plants into an indoor grow room. Plants need room to breathe and grow and overpacking the grow room will not increase crop yields; it just causes windburn and other problems. Consider adding fans with multiple settings so they can be tailored to the grow op or direct the fan toward a wall, so the plants are not exposed to direct winds.
It is worth a quick mention here that although autoflowering seeds make many areas of growing more simplified, they are not immune to the wind or any of the other plant stresses mentioned above.
A successful cannabis growing operation requires attention to detail and monitoring for certain conditions. By looking for the signs of windburn, pest infestation, heat stress, and the other problems we have mentioned here, you will ensure the quality and consistency of the crop whether your plants are growing in Louisiana, Nevada, or Illinois.