Vinca Flower Zone. Sep 24 2020 This vinca ie Catharanthus roseus is a tender perennial growing in USDA hardiness zones 10 and 11 according to Missouri Botanical Garden but gardeners grow it as an annual in most climates. Above zone 8 vinca major needs a shadier spot and more watering but becomes a perennial and under the right conditions can become invasive in very warm zones.
Vinca minor Periwinkle Little to Moderate Viola odorata Sweet Violet Regular FULL SUN Full Sun all day or almost all day. Vinca major and V. Many of the most resistant plants are poisonous some at all times and others only at certain stages of growth.
Vinca minor is an excellent carpeting plant for shaded areas under trees on banks or in large rockeries.
There are two main species grown. Periwinkles big cousin Vinca major is known as bigleaf or greater periwinkle. On Dec 15 2006 frostweed from Josephine Arlington TX Zone 8a wrote. Depending on your zone you can plant vinca flower in February March April May June September October.