Can big plants even grow properly in zero gravity?
You would probably need to spin the station to maintain the crew's health anyway. For those purposes the acceleration that results form the structure pulling the garden around the center of the spacecraft would be indistinguishable from gravity.
One issue with many traditional food crops is the relatively small percentage of the plant that would be directly consumed by the crew. If they can be convinced to consume algae bars and/or algae shakes instead of things like broccoli, lettuce and cucumbers the gardens could probably be smaller. With the more traditional crops much of the plant would have to be recycled to fertilize the next generation of crops.