Been using CFL's to grow this guy and everything was fine up until a week ago. The edges of the leaves started turning brown and yellow. Haven't been using any fertilizer. Any clue to what may have triggered this? Plant - Imgur
Your time release ferts in your miraclegrow soil are kicking in? Lol just kidding. It's early calcium defiency man.
Not sure about either. Haven't taken the PH yet, probably should do that. We recently switched to a better soil though.
Checking PH is essential to growing marijuana, especially when you start feeding. It's quite possible that you're feeding at a PH that's too low for the calcium and magnesium to be available. Since your in soil, I'm highly doubting that there isn't any calcium or magnesium available in the soil. Buy a 20 dollar PH pen and PH your water. The strips aren't sufficient, they fucking suck.
Will do. I was under the impression that a decent PH meter was around $80. Thanks for your help, man.