Some perennials that flower in autumn include asters, hardy begonias, chrysanthemums and gaillardias. Asters, which can grow from 8 inches to 8 feet tall, are prized for their star-shaped flowers of white, blue, purple or pink.
The hardy begonia is a warm weather plant with showy pink flowers. It does best in part to full shade and moist to wet soil. Native to China, it has a height and spread of 1.5 to 2 feet.
Chrysanthemum morifolium is related to the aster and produces masses of burnt orange blossoms from September till frost. Though it is a herbaceous perennial, it is often used as an annual and is tolerant of both deer and rabbits. It likes full sun and medium levels of watering and does not require pampering. It grows to a height of 2 to 3 feet and has a spread of 1 to 2 feet, though it tends to sprawl if it doesn't get enough sunlight.
Gaillardia, or blanket flower, is prized for its long bloom time, and it produces its daisy-like blossoms from early summer to fall. Like many fall plants, the gaillardia's blooms, which can be single, double or semi-double, come in shades of orange, red and yellow. It also attracts butterflies.