ive noticed the bottom leaves going yellow is that a problem ?
and also my auto outdoor grapefruit is starting to flower shod i just put lights on 12/12 but that will case my cheese bomb to flower any awnsers guys
Mature leaves at the bottom turning yellow is most likely a nitrogen deficiency. Check the N-P-K on your fertilizer; the first digit(s) being the nitrogen content. You might have to consider using a fertilizer with a higher nitrogen content.