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Polar Star features single white flowers with yellow eyes produced on tall, sturdy stalks. Unlike other hollyhocks, Polar Star is truly perennial. Plus, it has a low mound of foliage—so no need to hide bare stems. This drought-tolerant hollyhock adds charm to sunny back borders and cottage gardens. Attracts hummingbirds and butterflies. Because hollyhocks are tolerant of the toxic juglone that is emitted through walnut trees' roots, they can be grown under walnut trees. Deer and rabbits tend to avoid hollyhocks.