plants leaves are curling

[bongos99]

I am having a problem with my plants leaves curling under and dying. I have been growing cannabis for for a long time and never had a problem like this. What can I do to stop this problem?

 

[Canuck147]

Sorry, I was only able to read people's minds while I was working - now I'm retired. So let's see a pic and an overall scenario of what you are doing.