Looks like they are doing ok, maybe a little on the small side... make sure the temp isnt getting too low at night.. any lower than 60-65 and I would bring them inside. Also make sure they are in a nice dark spot if you leave them outside at night.. light from a nearby window or street light will effect the photoperiod! Are you feeding them anything? You might wanna try at least a one part food like Maxibloom from GH... something designed for flowering plants :-)