Preserved by families, collected by seed savers, passed around among farmers, heirloom tomatoes are now being sought out by more and more home gardeners as an alternative to the bland sameness of commercial hybrids. And happily, these growers are discovering that heirlooms are not only vastly more flavorful, but are just as hardy and easy to cultivate as the hybrids. Dr. Carolyn J. Male, who has raised more than a thousand heirloom tomatoes, here...