Smaller is better.
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"Smaller lawns mean less mowing, less maintenance, and less chemical pollution," says Steve Adamson, owner of Livingscape nursery in Portland, Oregon. He recommends dividing up your outdoor space with "steppable" plants, like low-growing creeping thyme, in areas of high foot traffic, and native plants, which are already acclimated and don't need irrigation or fertilizer. To find out what's native to your area visit plantnative.org.