Curling leaves can be attributed to not enough soil on the top side...some of the roots may be exposed to light and they turn to wood. Some of the spider roots can surface and watering uncovers these microscopic roots.

Can happen at the top and / or the bottom.

It doesn't look attractive, but there is no harm or no damage done to the end product.
HARDDON Reviewed by HARDDON on . Show your Main Colas !!! This is my AI (Aurora Indica = NorthernLights X Afghani) @ 24 days of showing sex and 35 days of 12/12. Her name is Jalissa. LET ME SEE YOUR MAIN COLAS!!!! Post: strain, how many days flowering, plant name & anything else you want :thumbsup: ... Rating: 5