Alright so this problem here seems to only be occuring on the older leaves and its just the very tip of the leaf and is on both plants. They are about 2 1/2 weeks into flowering ph is good room temp is good and so is humidity. They in a soiless mix called canadian gold. Being fed a 10-15-10 every watering. And no its not nute burn so please dont say that. I had a nursery specialist tell me that it could be a reaction to it being over watered a couple of times in the past but he is unsure cause he dont know how MJ reacts to things like thank anyway. Any suggestions would be nice. -peace.
Looks like a mild case of Nitrogen deficiency. Have a look at the picks in this thread. Every grower should have this one bookmarked http://www.icmag.com/ic/showthread.php?t=11688
HIGH All, so how does he know it's not Fert burn if he has no idea how MJ reacts. Over-fertilization. First leaf tips burn (turn brown) then leaves curl.
Yup looks like nute burn to me,on next feeding go a little lighter... Better yet do a light flush of the soil then feed with a smaller dose... Good luck
Unoit man i never thought about that one. good point lol i watered just yesterday and went a little lighter on it though. I also have some wierd yellowing going on with a couple of my bottom leaves. I know flowering makes the bottoms turn yellow but its yellowing in the viens first and then spreading out. And its not a uniform yellow its blotchy. but yeah thanks for the advice guys big help.