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This native of Mexico forms extremely vigorous annual vines which can grow up to 20-25 feet tall. They cover themselves in large bell shaped flowers that sit in a green saucer-like calyx. Flowers are at first greenish, then mature to velvet-blue or lavender. Very showy and easy to grow.
First, nick seed with a sharp knife. Then direct sow (edgewise) into prepared seed beds after all danger of frost. Thin to 24-36 inches apart. Can be started indoors in 2 inch pots (barely cover). Kept at 70-75° F., germination is in 10-30 days.