Ipomoea tricolor 'Heavenly Blue' is one of the loveliest of all climbers with huge trumpet-shaped flowers of deep azure-blue. Morning glory is an appropriate name for this beautiful Central American climber. The buds of 'Heavenly Blue', the most popular variety, are long and tightly furled, but as the morning sunshine reaches them, they can be watched steadily unfolding themselves into 8 to 13 cm (3 to 5in) wide sky-blue trumpets with clear white and yellow throats. Each flower lasts only a day, but others follow in quick succession. Ipomoea is a good climber for walls, trellis work or if allowed, to scramble through other plants or trees. The blue, trumpet shaped flowers up to 6 cm (2½in) across are attractive to bees and butterflies.