The broad group of hardy perennials is justly popular in colder climates (they're generally appropriate for gardens in USDA Zones 3-8 — see Chapter 3 for details on hardiness zones). These plants emerge each spring, producing foliage and flowers. Come fall, their top growth dies down and the show is over for the year. But the roots live on underground, waiting to revive and do it all again when warm weather returns.
Popular examples of hardy perennials include aster, columbine, coneflower, daylily, delphinium, mums, penstemon, peony, phlox, and Shasta daisy.
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