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Wind Burn

Most of the time issues with air flow tend to be from lack of air flow or stagnate air flow. More often then not air flow is an important part of an indoor or outdoor cannabis grow, exchanging air in a space is an important part of a healthy environment. But there is a point when air flow will cause leaf damage referred to as wind burn or wind damage. 

To much air flow can have negative effects on leaves and your plants health, causing to much transpiration and/or damaging your leaves. 

Windburnd cannabis leaves are clawing hard

Wind damaged leaves will look like other issues, like nitrogen toxicity and or watering issues. Most of the time what you will see with wind damage is where the wind is highest you see issues but not where the fans are not blowing. Clawing cupping, dead leaves all possible signs of wind damage alone.

These clawed leaves were wind-burned

Just for reference, here’s what too much wind/fan looks like!

Too Much Fan!

Placing Fans

  • Ideally you want air movement to be even above and below canopy and to be moving in a unified direction..
  • Air movement should be gentle but enough to move leaves a little bit
  • Putting a plant in front of even a small fan, can have a negative effect try to use fans to move air and not plants.
  • 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.
  • I highly recommend the use of oscillating fans, perimeter air flow can be expensive with tubing and industrial horticulture fans, a well-placed oscillating fan will easily move enough air without damaging your plants

Growing cannabis circulation diagram

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