Low-maintenance perennials add color and charm to woodland gardens, native plant gardens and naturalized areas. Native to the United States, spiderwort's 1-in., three-petaled flowers open in clusters atop sword-shaped leaves. Spiderwort Plant Mix is a random mix of white with blue centers, red-purple, china blue, white and purple violet. These easy-to-grow perennials will bloom continuously all summer long into fall. The plants grow 18-30 in. tall and require very little attention. For best performance, plant in partial shade. Zones 3-9.