Use an aerator.
Credit: Dorling Kindersley / Getty Images

Many popular herbicides are known hormone disrupters and find their way into the house on shoes and pets. As an alternative, aerating, spading, and hoeing break up weeds just as effectively and help prevent insect infestation. "Avoid weed-and-feed combinations," says Jay Feldman, executive director of organic growing advocates Beyond Pesticides. "What the soil needs more is air."