Some of my plant leaves are curling up, but only bottom leaves. It looks like heat stress but I think its something else, because why then only bottom leaves curling up, top ones would be the curling up also. Take a look at the picture guys, maybe you know a reason why it is that way. and what to do.
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I thought the same thing that lighting is incorect. But previous grow didn't had any of these problems with leaves. And I think if lightning would be incorrect, top leaves should show curling as well?