It is likely a nitrogen deficiency. Nitrogen migrates from old growth to new causing first pale green leaves, then yellowing and withering of the lowest leaves.

If leaves are solid yellow they aren't doing much.
LolaGal Reviewed by LolaGal on . Cutting: right or wrong?? Well my automatic ak47s are almost 5 weeks old and I notice some of the big leaves are starting to turn yellow. I also noticed that the steam they come from are duplicated, by that i mean that the new leaves come from a new steam right up from the older and bigger ones. My question is: Should I cut the old leaves off so i can provide more energy for the new ones or should i let them die and fall down by theirselves? Please experienced members, help me out! Thanks! Rating: 5