As long as it is not planted in full sun, periwinkle is an ideal groundcover for both large or small areas and under densely-rooted trees where little else will grow. For covering large, shaded beds or banks in a single season, fast-growing periwinkles are one of the best groundcover choices. They go especially well with hostas, ferns and spring bulbs.
Container Gardening: Periwinkle will grow in tubs or large clay pots on a shaded porch or patio. The large type is especially attractive in window boxes, and hanging baskets, cascading down and filling in around colorful annuals.