Its vivid blue-and-white swirls make the 'Flying Saucer' Morning Glory a singularly pretty flower. This one caught our eye in the Xeriscape Garden in late October. Given full sun, average soil, and good drainage, the vine grows vigorously and quickly to 12-15 feet long. Like most morning glories, it's ideal for trellises, arbors, fences, poles, and other structures.