(,i>Ipomoea tricolor Heavenly Blue has been grown in US gardens since the early 1900s. The blooms reach 5 inches across and are a delicate sky blue with a contrasting white throat. Traditionally used to adorn mailboxes, Heavenly Blue blooms are open in the morning until they close with the heat of the summer day. The heart-shaped leaves are attractive as well. Most/full sun - Grow as Annual (tender perennial) - 20+ seeds.