So my plants are yellowing starting from the bottom big leaves and the top leaves would yellow too but once they get bigger they turn back green so what do i do?
they look like they have nitrogen deficiency . That can be because of nutrient lockout, over watering , soil compaction, lack of nutrients in the soil, and a few other things. Not trying to sound rude but without information about your grow it hard for anyone to do more than speculate. It is always good to be as detailed as possible when asking about sick plants. Includingthings like temperature , lighting , pot size , brand or mixture of soil , watering frequency , nutrient brand dosage and schedule if feeding , and lighting schedule will help to ensure you get more accurate answers.