It may just be your lighting but your leaves look rather dark which can be a sign of overnute (nitrogen) which can also cause the other symptoms you are describing. Unfortunately I don't grow in soil but many here do and would probably like to know what kind of soil you are using. All info helps....
Weedhound Reviewed by Weedhound on . strange browning pattern on lower leaves *pictures Got a youngling I think going on 3 weeks. with previous plants I have seen the first set of single blade leaves ( after the embryonic leaves ) yellow and wither off over time. I have attached a couple of pictures of the strange discoloration on these leaves . It is growing under a couple of CFL's, I just wanted to see if anyone recognized this as some sort of problem. The taller leaves don't show this, the only hint of this on the upper leaf is shown in picture 2, so I don't think it is heat Rating: 5