Cannabis leaves curling up like tacos – heat stress?

My leaves are curling up along the edges, making them look like taco shells. The tent temperature is around 85°F with the lights on. Is this heat stress? How do I fix it without buying an AC unit?

3 comments

3 Comments

Experienced1mo ago

85°F is too hot for most cannabis. Ideal range is 72-80°F during lights on. Fixes WITHOUT an AC unit: 1. Raise your light higher (less radiant heat) 2. Increase extraction fan speed 3. Run lights at night when ambient temps are lower 4. Add a clip fan for air circulation 5. Leave the tent slightly unzipped for more airflow The taco-curling is your plant trying to reduce surface area exposed to heat. It'll recover quickly once temps drop.

Expert Grower1mo ago

Also check your VPD. At 85°F you need higher humidity (around 60%) to keep VPD in the right range. Low humidity + high heat is a double stress on the plant.

Experienced1mo ago

Running lights at night is the easiest free fix. My tent drops 10°F just by switching to a nighttime light schedule during summer months.