I haven't planted mine yet, it is rather early. Sounds like yours are struggling to reach the light. Keep them frost free for a few more weeks - I had to scrape frost off the car last night - then harden them off by gradually leaving them for longer periods of time outside but bringing them in at night.

Mine have hardly started and the've been in ages. I agree with Cammomile, need more light. Also have you been watering them too much?