Noticed some early signs of iron deficiency (I’ll take a pic when the lights cut on tonight) so I sprayed it with some iron chelate solution (1/8tsp to a pint) is this necessary/useful and if so how long into flower is it safe to foliar feed?
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A pint? 
Just kidding, I suppose as long as you don’t spray the buds it will be fine … 
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I stop after buds start to form. I still will spray the lower leaves if there is a really bad deficiency. Anytime I foliar buds I get some mold.