This is my second crop of spinach.
Has been AWESOME to date. In fact, if I sit out there long enough, I can find enough for a huge pan of spinach lagagna
but, I digress
Why are the edges getting yellow? is it too much water or too much sun?
Spinach - yellow edges
Looks a bit like sunburn to me, doesn't spinach prefer cool weather? Could be TX is too hot for it as you start to get into the summer. Or it might need some fertilizer. You might try posting this in the veggie gardening forum too, I'm sure there are a bunch of people there who grow spinach.