Autumn color comes from more than the color-changing leaves. Flowers join in with brightly-colored flowers. Plant flowers that are in season in the autumn near evergreens. The flowers complement the green leaves and the leaves make a background that shows off the colors of the flowers.
Windflower (Anemone x hybrida 'Honorine Jobert) blooms in August and September and is hardy in USDA Zones 4 to 8. The plant grows from 3 to 4 feet tall and 1-1/2 to 2 feet wide. Single, white flowers measure 2 to 3 inches in diameter growing on long stems. Dark-green leaves grow in a mound under the flowers. Plant windflower in full sun or partial shade and a soil that is moist and well-drained.
Blue sage (Salvia azurea var. grandiflora) grows from 3 to 5 feet tall and 2 to 4 feet wide. The plant is hardy in USDA Zones 5 to 9. Azure-blue flowers grow in long clusters from July through October. Narrow, lance-shaped, gray-green leaves measure 4 inches along and grow at the base of the plant. Plant blue sage in full sun and moist to dry, well-drained soil. Bees and butterflies will stop by for the nectar.
Smooth aster (Aster laevis) blooms in September and October. The plant grows from 2 to 4 feet tall and 1 to 2 feet wide. The small flowers grow in clusters and have violet to purple petals and yellow centers. Leaves are smooth and blue-green. Plant smooth aster in full sun and a soil that is dry to moist and well-drained. The plant is hardy in USDA Zones 3 to 8. The flowers are a favorite of the local butterflies.
Ornamental onion (Allium thunbergii 'Ozawa') blooms in September and October and is hardy in USDA Zones 4 to 9. The plant grows up to 12 inches tall and 8 inches wide. Leaves are thin, round, resemble blades of grass and turn orange at first frost. Red-violet flowers grow in clusters 1 to 2 inches in diameter. Plant ornamental onion in full sun or partial shade and average, well-drained soil.
Cyclamen (Cyclamen persicum) grows up to 8 inches tall and 8 inches wide. The plant produces clumps of dark-green leaves. Pink, red, violet, lavender or white flowers bloom in November through March. Plant cyclamen in partial shade and an organically rich, well-drained soil. The plant is hardy in USDA Zones 9 to 11.