So i noticed the first signs of DRAMATIC leaf colour change yesterday on two of my Mystery Seed/Juicy G plants. My inital reaction was that the 42w CFL bulbs i am using are too close to the plants and burning the leaves, but this discolouration effect only happened on 2 of my 8 plants and of those two only one or two lower leaves were affected.
To compensate i raised the lights another 4" from the plants, but when i returned today the yellowing edges have carried to another set of lower leaves on the same plant! I would usually reference my grow guide, but its currently on loan to a friend.
If this were a potassium deficiency over fert burn wouldn't all of my plants be showing signs of this? I have 4 Jack Herer plants that have not shown any signs of discolouration...
What could be causing this? Any remedy suggestions?
In the meantime... i'll be reading endless threads till i find out...