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Best grown in evenly moist to dry, well-draining, sandy, rich loams in full sun to partial shade. Tolerant of rocky and clayey soils as long as they are not overly moist. Tolerant of drought once established. Plants may go dormant during periods of summer drought. Cut the foliage back in late winter before new growth emerges in spring. Will readily spread by seed given the right conditions. Hardy in Zones 7-10 but generally grown as an annual in the St. Louis region.