A home gardener found this early-flowering version of sky-blue morning glory with heart-shaped leaves and, recognizing its importance, saved its seeds. It came to the attention of a Dutch seedsman who increased the stock and offered it under the name of 'Clarke's Early Heavenly Blue' in the early 1930s. It quickly became the most planted morning glory, then and today. This vine produces huge flowers and can be grown up strings on the edge of your porch or arbors and large trellises.