Hopefully some other folks will chime in here with small farm recommendations, as I do mostly ornamentals. For edibles, I just use my old Georgia MG handbook. Their recommendations for North GA track pretty well here in Knoxville, and there's good info on typical pests and diseases. Don't forget to check with your local Ag Extension office for free publications and advice.
My shelves are loaded with books on ornamental horticulture, but one I pull out frequently when designing is The Southern Gardener's Book of Lists by Lois Trigg Chaplin. Other favorites are plant specific books like The Color Encyclopedia of Hostas (Greenfell), Gardening with Conifers (Bloom), Japanese Maples (Vertrees, I like the old 2nd edition better than the new one).
My best advice before buying any book is to see if your library has it. Too many books that promise to be the "Complete Book of ..." end up being very general, "coffee table" books when what you want is good, practical info.
