More than half of the 500-odd species of twining climbers, annual or perennial herbs, shrubs, and small trees in this large and variable genus originated in the Americas. Commonly known as morning glory, they are widely cultivated in tropical to warm-temperate areas for their showy flowers and vigorous growth. The genus is notable for easy culture, quick growth, and beautiful bell-shaped to tubular flowers appearing in colors ranging from purple through red to blue, white, or yellow. Individual flowers can be short lived but may open in succession in heads or on stalks. Some species, including the sweet potato (Ipormoea batatas), have tuberous roots that are edible.
CULTIVATION
These plants prefer full sun and plenty of water in the growing season, but will make the best of most conditions. Some species are propagated from softwood or half-hardened cuttings. Seeds are better started under glass. Germination may be improved by cutting a notch in the seed or soaking in warm water.
Top Tip
The climbing ipomoea species, such as I.nil or 1. horsfalliae, can be trained over arches, pergolas, fences, and trellises or over a cliff or steep grade.
CULTIVATION
These plants prefer full sun and plenty of water in the growing season, but will make the best of most conditions. Some species are propagated from softwood or half-hardened cuttings. Seeds are better started under glass. Germination may be improved by cutting a notch in the seed or soaking in warm water.
Top Tip
The climbing ipomoea species, such as I.nil or 1. horsfalliae, can be trained over arches, pergolas, fences, and trellises or over a cliff or steep grade.
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