Hardy hibiscus hybrids descend from several species native to the eastern and central United States, including the wetland-loving H. moscheutos and H. coccineus, and that American lineage shows in their toughness. Despite the tropical scale of their blooms, these plants are winter-hardy to Zones 4 or 5, dying back to the ground each fall and resprouting reliably from woody crowns come spring. Each individual flower lasts only a single day, but new buds open in succession across a long season from midsummer through early fall, sometimes pushing on until frost. The clump grows larger every year, so the display only improves with time.

They prefer rich, consistently moist soil and full sun, which produces the sturdiest stems and the best resistance to disease. Good air circulation matters too, so site them away from walls and dense plantings. Cut stems back to 3 or 4 inches in late autumn, and resist the urge to tidy up too early in spring — these plants are reliably late to emerge and are easily mistaken for dead well into May. Near a pool, patio, or pond margin they are at their most dramatic, and the flowers draw hummingbirds and specialist bees throughout the season.