Periwinkle or vinca minor is a perennial evergreen groundcover that produces purple flowers in the spring. Although some people consider it invasive because of its ability to spread easily, it is a good choice for those shady areas of the yard where grass has difficulty growing. Since the pretty, dark green foliage only reaches a maximum height of about 6 inches, shade-loving bulbs can be interspersed among it in order to lend variety and color.
Choose a shady location with soil that drains well. Established periwinkle plants can be purchased at most garden centers in the spring. After the last frost, set the periwinkle into the ground at the same depth as the dirt enclosure in which it came. Water well. Additional plants should be spaced about 12 inches apart since they will fill in quickly. Once you have a good supply of periwinkle, you can easily transplant it to other areas of your yard by digging up plants, separating them and replanting.