PH

[enzapimp]

My ladies keep turning yellow and shade's are curling up. They are fine till they get around 24 inches. PH is at 7?

 

[Theophagy]

Are you using any nutes? could be N def.

 

[925Grow'N]

My ladies keep turning yellow and shade's are curling up. They are fine till they get around 24 inches. PH is at 7?

Your PH is too HIGH! Optimal ph for MJ plants is 5.5, with my nutrients I get 6.0 ph at the highest and that is only because of the Humboldt Nutrients Myco Madness. It is a beneficial root powder that helps the roots grow(it really works!). I would get some ph down or you can do it the old school way...take a fresh lemon and squeeze a little of the juice in and mix. Test water, and if you need to lower it more, add more lemon juice. As far as the yellow curling leaves it sounds like you might have nute burn. Got some pics?

Good luck!

 

[enzapimp]

I think I got it my bulb is very old. Changed it now I'm going to see if they recover. Thanks for the replys. My gears were grinding.