Answer: Hibiscus moscheutos 'Ann Arundel' is reportedly hardy from zone 5, south. You're in zone 5, so a protected site should allow your Hibiscus to survive the winter weather. Provide full sun and regular, deep watering for your Hibiscus, and provide a mulch over the roots to help keep the soil moist. The stems and leaves will die down in winter but new stems will sprout each spring, providing mid- to late-summer blooms of pink on your 'Ann Arundel'. Once established, your Hibiscus should reach 6'-8' tall. After frost nips the stems, cut to ground level and remove the plant debris from your garden. If you place a thick layer of mulch over the soil, you'll help keep the ground from alternate freezing and thawing which might pitch the roots right out.
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