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You can use a south facingYou can use a south facing window. Just be aware that celery and romaine are more in tune with cooler weather and a south facing window might make them too hot and they would rot within a week. A cool place in the house with florescent lights or a eats window might be better.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?