I had a similar problem and it turned out to be humidity. The leaves would curl up and the stem would look a little white or pale (almost like it was shedding).

I just took out a fan and then put bowls of water around the plants so the light would evaporate it. Seems to be working.

You should keep your humidity around 40-60 percent.

I would also move your light a lot closer.

Good luck with your grow!
Raelum Reviewed by Raelum on . Leaves curling up at the edges :( My plants are curling up at the edges. I just transplanted them into an organic potting soil; coffe ground compost mix with a slow release fert. I need help, am I overwatering, over fert., over lighting or what? I have them on a 18/6 schedule but shortly after transplanting they began to wilt and curl at the edges. I'm scared guys soo scared... I will provided some pictures shortly any prelim. suggestions? :question: Rating: 5