For my kitchen garden, I built eight 4-by-8 foot beds from inexpensive, rough-hewn hemlock. Hemlock, like cedar and redwood (these last two are pricey) is naturally rot-resistant. The boards of these beds are 12-inches high and 2-inches thick. Running perpendicular to the hemlock-enclosed beds are four 2-by-8 foot beds framed with 1-by-10 inch pine. Paths here are paved with shredded wood chips, and the garden is protected from woodchucks, rabbits, and deer by wire-mesh fencing.