According to Colorado State University Extension research, you can quadruple per-square-foot production of small kitchen vegetables such as lettuce, carrots and beets by planting them in blocks within wide beds rather than in rows. Block planting makes efficient use of space by keeping the spacing between plants tight and eliminating unnecessary pathways.
Try Vertical Gardening. When he moved from suburban Baltimore to a ground-floor condo in Albuquerque, N.M., lifelong organic gardener Ary Bruno went vertical to make the most of his limited space. By adding 3 to 4 inches of compost to his compact beds each spring, Bruno can grow trellised tomatoes, pole beans and cucumbers in his patio garden in summer, followed by greens in fall. Vertical growing can greatly increase your garden returns.