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Create the proper environment
Hardy plants will survive living near the street, but even these plants benefit from some extra attention. Enriching the soil quality is essential. Do this by elevating the bed with timbers and adding a 3-in. thick layer of mulch to conserve soil moisture and protect roots. Water these plants frequently and deeply. Also, hose off the foliage to remove dust, soot and salt, being sure to spray even the underside of the leaves.
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Asters are perennials that grow in full sun and provide bright color in the fall. You'll find pink, purple, blue and white plants that have a compact growth pattern. If you're new to gardening, this collection of tips will get you off to a good start. There are even a few in there for seasoned gardeners!