Vinca makes a good groundcover under trees because it tolerates shade and has small roots that radiate out instead of going deep. Rhododendrons and azaleas are popular woodland shrubs that thrive in dense shade. Hyacinths not only add color in shade, but add fragrance to the garden as well.
Caladiums grow well indoors, in full sun or in shade.
Native to Asia, Astilbe is easy to grow in average garden soil and requires plenty of moisture. Does well in dense shade. Daffodils, crocus and grape hyacinths all do well and add spots of purple, yellow and white. These showy foliage plants feature large heart-shaped leaves of red, pink, green and white. They prefer full shade and grow to a height of approximately 15 inches.