Celery grows slowly. Make sure that the seedlings have plenty of light — such as by a window (if not too cold or drafty), or under fluorescent growing lights (held about 3 inches above) for 16 hours a day (they do need a period of dark, too). Keep them warm, around 70 to 75F in the day and 60 to 65F at night. Make sure the plants are getting the right amount of water. After a while, they should start to grow taller. Good luck!
Celery grows slowly. Make sure that the seedlings have plenty of light — such as by a window (if not too cold or drafty), or under fluorescent growing lights (held about 3 inches above) for 16 hours a day (they do need a period of dark, too). Keep them warm, around 70 to 75F in the day and 60 to 65F at night. Make sure the plants are getting the right amount of water. After a while, they should start to grow taller. Good luck!