Posted: 16/05/2013 at 18:38
Hello, these are young parsnip plants. Thin them out to about 6" apart. Just carefully, with your fingers, pull out the excess.
Do the same with the little gem lettuces, you will find that if you pinch out a few together and look at them each one will have it's own roots a a few leaves.
Sorry, I've never grown turnips, don't like them much, and onions I grow from sets (baby onions that you plant). But I think the onions look a bit small to handle. I'd leave them a little longer.