I planted kale seeds in the top of an egg carton, and they are doing good. The problem I am seeing though is that the outer-most leaf goes yellow and wilts. I've been clipping these off. I read to give more sun, so I put them under a plant light for the first 4 hours or so of the morning (I wasn't doing this until 2 days ago) - I also read it could be fertilizer they need, so I fertilized them a little (wasn't sure how much I should do since they are very young).
Then I thought maybe the yellowing at this stage is normal? Maybe those outer most leaves die off as new leaves come from the center? I had this thought because the very first leaves (shaped differently) also became yellow and wilted.
OR - Do I need to transplant them into little pots? I was hoping to let them grow in the egg carton and then transplant outdoors at the end of winter. I could transplant now though into little pots if that would help.
What do you guys think? All suggestions are appreciated (I am very new at this!).