Nothing causes more headaches, backaches, and heartaches for gardeners than weeds: these many-petaled, many-seeded, and many-rooted fiends. Stealing sunlight, water, and nutrients, they may leave our gardens looking grim and growing poorly. The chemical army is losing. Resistant weeds are spreading. Soil health is suffering. Drift and overspray destroys thousands of adjoining farms, homesteads, and properties each growing season...