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Ipomoea purpurea Grandpa Ott
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Flowers of intense violet-blue, with a ruby red star produced in profusion on the plant. It is a good climber for walls, trellis work or if allowed to scramble through other plants or trees. It may be grown in a warm sheltered spot outdoors, or inside a conservatory. The blue, trumpet-shaped flowers up to 7cm (2½in) across, close in the afternoon and are attractive to bees and butterflies. It requires a warm sunny position and well drained soil.