悟る · diagnose & fix
Cannabis Heat Stress
Environmental stress · also: heat damage, tacoing leaves, leaf cupping
Upward-cupping ("tacoing") leaves and crispy edges on the top canopy when the grow space runs too hot.
Not sure it's heat stress?
Snap a photo and get a free read — no signup. Satoru weighs the visual against the conditions that cause look-alikes, so you treat the real problem.
What it looks like
Upper leaves cup/curl UPWARD at the edges like a taco, edges turn crispy brown, and in flower foxtailing or airy buds can appear. Worst directly under the light and during lights-on heat.
Symptoms
- Leaves cupping/curling upward ('tacoing')
- Crispy brown leaf edges on top growth
- Wilting during the hottest part of lights-on
- Foxtailing or loose buds in flower
Causes
- Air temp too high (ideal roughly 20–28°C / 68–82°F)
- Light too close adding radiant heat
- Poor airflow/exhaust
- Low humidity compounding transpiration stress
How to fix it
- 1Lower temps: more exhaust/intake, AC, or raise the light
- 2Improve airflow across the canopy
- 3Bring VPD into range so the plant can transpire normally
Prevention
- Hold canopy temps in range with adequate ventilation
- Manage VPD (temp + humidity together), not just temperature
悟る · how satoru tells it apart
Upward taco-cupping is heat; droop is usually water. Satoru reads your logged temp + humidity (VPD) alongside the photo, so you fix the room instead of mis-diagnosing a watering problem.
Commonly confused with: Light Burn, Underwatering, Overwatering.
Not sure it's heat stress?
Snap a photo and get a free read — no signup. Satoru weighs the visual against the conditions that cause look-alikes, so you treat the real problem.
More plant problems
Educational reference for cultivation troubleshooting. Symptoms overlap — when in doubt, match against your own conditions. Satoru fuses your photo with your logged environment for a grounded read.