I'm gonna chime in without reading the whole thread. The third pic has what I think is called nitrogen claw. ie too much N. It doesn't take much to get it and it's not a big deal. Hey I did it too so don't fret. The yellow leaves at the bottom could be a couple things I really dont know but I will tell ya NOT to trim them off, ok? You're vegging for enough time so flip the switch unless you want five foot tall plants. Gonna top them? Scrog? How many colas do you want to end up with? Personally I like UB's method of pruning to produce two to four main colas. Better to think about these things now before the plant wastes too much energy.
I would also like to say that for your first grow, you've done a terrific job
Thanks, Dannyboy. But I want to say straight out that any success I have had or will have is entirely due to what I have read here. In my previous life - before retirement - I was primarily a researcher, and that seems to have served me well.
I already topped the biggest plant twice, just to keep it under control, haven't touched the rest. I figure I want to learn as much as I can before I start getting fancy. Plus, after all the trouble of getting them going, I just couldn't bring myself to trim it back between the 2nd and 3rd node....I know, I'm a pussy.
The tallest plant is only a 14" and the rest are just getting to 12". I thought that they would double or triple in size with the switch, so I was waiting for 15 to 18". Is that too tall, do you think?