Possible K deficiency?
This is my first ever grow and I have 2 bag seeds growing in potting mix. About 8 weeks old under fluorescent lights and I’ve just started hardening them off to be outside for the summer. I just started giving them fox farm big 3 nutrients after feeding them miracle grow plant food while waiting for the fox farm in the mail. They have both developed light brown/gray and brittle spots on lower sets of leaves. Although one plant is definitely worse than the other, the both have it. After reading some of Ed Rosenthals “marijuana garden saver” I suspect a possible potassium or calcium deficiency. Is my hunch accurate or could it be something else? Pictures are attached. Any/all advice is appreciated!! Thank you!
Welcome to Percys mate, I say it was caused by the Miracle gro, that stuff isnt good for cannabis plants, very strong. But you should stop using it now the fox farms is here though right? She should start picking up now, but only give her water for a few feeds, dont add any food to it at all. Let the plant eat whats in the medium first
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