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Lamb's-ears is a top pick for a groundcover in a hot, baked spot. Its silver felted foliage quickly forms a dense, delightful mat. It also contrasts nicely with other foliage and most flowers. enhances almost everything. Depending on the type and your growing conditions, it may self-sow freely to the point of becoming a bother. In hot humid climates, lamb's ears may "melt down" in summer, becoming brown and limp.
A quite different but related plant, big betony is worth growing for its shade tolerance, dark green crumpled leaves, and bright purple spikes of whorled 1-inch flowers in late spring. Wood betony is similar but not as shade-tolerant.
Part Sun, Sun
Under 6 inches to 3 feet
12-48 inches wide, depending on variety