Gardening on rooftops, balconies, and terraces is a popular trend. After thirty-five years of experience, Susan Brownmiller writes with honesty and humor about her oasis twenty floors above a Manhattan street. She reports the catastrophes: losing daytime access during building-wide renovations; assaults from a mockingbird during his mating season. And the joys: a peach tree fruited for fifteen years; the windswept birches lasted for twenty-five. Butterflies...