Granddaddy Purple Photoperiod

Little bit of a rough week. My timer on my light is only working when it wants to, so I gotta check to make sure it comes on and goes off when it is supposed to. My middle plant is getting rust color spots on most of the leaves. I can only assume a nute deficiency but more likely I have lockout. Maddening, as this was my best looking plant. Still think I will get a pretty good harvest when it comes time. Thanks for stopping by!