If you’re hunting for Maria Finn, check the roofs of San Francisco, where she sets up edible gardens for clients. Maria’s also a writer (she contributes to Sunset) and recently penned A Little Piece of Earth (Universe Publishing, 2010; $20). The book’s simple message: You don’t need acres to grow edibles. “In a small space, you’re not going to live off your harvest, but you can do things like grow kaffir [‘Kieffer’] limes, using the leaves to season homemade curry, or grow ingredients to make cocktails. These ideas make life richer.” Click ahead to see what adds style to her garden.