Just for reference, here’s what too much wind/fan looks like!
A closeup of those wind burn leaf spots – not bugs, not a nutrient deficiency!
Small oscillating fans are great for the grow space since they’re cheap and can be used to provide a nice gentle breeze to a relatively wide area without blowing on any one part too long.
Ideally you’d like a nice breeze surrounding the main canopy, which means you want air blowing above and under the plants.
Too Much Fan!
After placing fans, check around the grow area to make sure that all parts get a slight breeze. If you feel stagnant air or a lack or breeze, you may want to adjust your fans.
Wind-burned leaves are often curved under and form “claws.” They can look like they’re droopy from overwatering, underwatering, or possible a nitrogen toxicity, but you know you’ve got wind-burn when the leaves in front of the fan are clawing, and leaves further away from the fan look fine.
Don’t point a strong fan directly at a plant, because too much wind can start to damage the leaves and stems. Sometimes if you have a small space it’s better to point the fan at the wall than directly at the plants.
Exposure to too much breeze from the fan can affect the cannabis leaves to start to curl and "claw." Learn about wind burn and how to prevent it.