I HAVE done a huge amount of reading and I am just getting back into it again after about 10 succesful grows a few years ago so I am no newbie!

The temps are around 70f when lights are on and about 60f when off.
Humidity is between 40 and 50%.

You seem convinced its nute burn.
I would like to hear other opinions too please.
brainfood33 Reviewed by brainfood33 on . Leaves curling up at edges Hi, I've been growing this Jack Herer from seed and they're just coming up to 2 weeks in veg. Its a hydro setup and they are under a 400W metal halide which is 11 inch from the tallest plant. They have only just made it to full strength nutes after spending the first week getting 1/4 then 1/2 strength before hitting full strength a few days ago. The problem though, is that most of the plants are showing this leaf curl in varying degrees. It starrted on the lower leaves but now new Rating: 5