Posted: 10/07/2013 at 13:43
Are you 100% sure they are carrots? The form and foliage look very much like love-in-in-a-mist (Nigella) to me. Carrots have a separate stem for each leaf, all of which come from the top of the carrot. Your plant seems to have a single stem with leaves emerging from it at vaying heights - that's exact;ly how nigella grows.
Edit - or Cosmos as FB said - difficult to tell until the buds appear.
BTW, carrots don't transplant well - always best to sow them in-situ. They send down one very long thin root from the seedling which eventually swells into the carrot. This very delicate root invariably breaks if you try and transplant, unless you sow them in root trainers or loo rolls etc.