Underwatering cannabis plants
What it looks like
Leaves droop and feel thin and papery. The pot is light. The plant perks up after a proper watering, which separates it from root rot.
What usually causes it
Water slowly until the medium is wet through, then let it dry back. A pot that goes from soaked to bone-dry every day is a size or airflow problem.
Check this first
Droopy, light pot, leaves perking up after a watering. Lift the pot. If it is light, water it.
This is identification for a home grow. It is not a pesticide label and not medical advice. Follow your local law.