The decline of cheap oil is inspiring increasing numbers of North Americans to achieve some measure of backyard food self-sufficiency. In hard times, the family can be greatly helped by growing a highly productive food garden, requiring little cash outlay or watering.

Currently popular intensive vegetable gardening methods are largely inappropriate to this new circumstance. Crowded raised beds require high inputs of water, fertility and organic matter, and demand large amounts of human time and effort. But, except for labor, these inputs depend on the price of oil. Prior to the...