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This relatively uncommon plant, which has striking morning glory-like flowers, is well worth growing if you can find it. Nolana bears beautiful blue flowers all summer long, even in the hottest weather. It has a trailing habit that looks great in hanging baskets and containers. It does best in full sun and moist, well-drained soil. Though it's grown as an annual in most of the country, it is hardy in Zones 8-11.