Once vinca starts blooming in late spring, with minimal care, it will keep on flowering all the way up until the first frost. Most vinca varieties can be found with blooms in red, pink, white or purple. Annual vincas are also known as periwinkles and are native to semi-arid regions of africa, which is why they do well in warmer and drier settings. This guide on “how to grow vinca flowers ” will help you to grow them year after year after year. Native to madagascar, the plant performs spectacularly on even the hottest summer days. Typically 8 to 12 inches tall, annual vincas grow well in hanging baskets, containers, beds and borders. This plant is known by three names: But rather than being a shade lover, annual vinca is a perfect choice for sunny locations. · annual vinca plants have five petals and love hot weather. · annual vinca with its array of colorful blooms held above glossy, emerald-green foliage passes the heat test with flying colors. The foliage is dark green and leathery, and the flowers and foliage resemble impatiens. In addition to having large, brightly colored flowers, vincas also have attractive foliage and are eye-catching even when not in bloom. Although they are actually hardy in zones 9 through 11, they grow as annuals in all other zones. · annual vinca ( catharanthus roseus ) is a tropical perennial that is grown as an annual in most regions. Their single blooms have a contrasting color center and typically come in vibrant colors like pink, lavender-rose, mauve, red, apricot, tangerine, and white. Vinca , periwinkle (or madagascar periwinkle), and myrtle. Their bloom time is during early summer or june until the first frost. A favorite choice for southern gardens, annual vinca flowers are sun loving and heat tolerant.