I remember a movie along these lines--'Silent Running' with Bruce Dern. Clifford Simak's City stories include farmers and recurring pastorals scenes, as do his great story 'Way Station.' Theoretically, you could look at Larry Niven's Ringworld constructs as gigantic hydroponic constructs. But you may be thinking of Alan Steele's 'Orbital Decay', where a beamjack grows some weed in the hydroponics bay.