Growing Celery.... Indoors????

Does anyone know if Vikki puts this in the dark or in the window...  Vikki had planted celery plants this year as an experiment and they grew great.  She canned up a bunch.  But in the book "Putting Food Up"  it mentioned root cellaring celery but standing it up in a pot of soil.  We can't put it in the crawl space below the cabin or it would get far too cold down there.  
Photo is of Vikki and her Mom...   they had a small holiday together this last summer.  She is 83 and Vikki had a hard time keeping up.