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SUN: Annual vinca loves full sun. It will tolerate part shade but may become leggy if there is too much shade.
SOIL: Vincas demand well-draining soil. Add compost or grit to your heavy soil; alternatively, plant vincas in raised beds or containers with a porous, well-draining potting mix.
WATER: Watering too frequently is a common mistake with annual vinca. Water when the top inch of soil feels dry to the touch.
BLOOM PERIOD: It blooms all summer from July through September, only stopping at frost.
WHEN TO PLANT: Plant vinca seedlings after the last frost date in your region.
Annual vinca (Catharanthus roseus) is a tropical perennial that is grown as an annual in most regions. It has flowers and foliage that resemble impatiens, but rather than being a shade lover, the annual vinca is a perfect choice for sunny locations. The foliage is dark green and leathery. Fast-growing 6 to 18 inches tall. Annual vinca plants bear single blooms with five petals that frequently touch or overlap from early summer until the first frost.