Fall blooming flowers will be some of the last flowers to arrive in the garden if winter plants aren't planted. Some flowers that bloom in the fall only bloom during this season, and others can be secondary blooms for plants that can flower twice in the season. Fall flowers are from many plant families, and there are several good selections to choose from.
The mountain marigold (Tagetes lemmonii) is from the aster/daisy family. It is a fragrant perennial that is drought tolerant and attractive to butterflies. Leaves are 2 to 6 inches in length and lacy with 2-inch-wide flowers in yellow. The entire plant can reach 4 feet tall and 6 feet wide. Grow mountain marigold in full sun in well drained soil. Propagate via clump division, seed, or by cuttings. It is hardy to USDA hardiness zones of 8 to 11.
The leadwort (Plumbago auriculata) is from the leadwort family. It is an evergreen shrub that is drought tolerant and attractive to butterflies. Leaves are light yellow green and 2 inches long. Flowers are blue and 1 inch long. The mound can get approximately 3 to 10 feet tall. Grow leadwort in light sandy soils in full sun. Propagate via tip cuttings and by seeds. It is hardy to USDA hardiness zones of 8b to 11.
The garden mum (Chrysanthemum hybrids) is from the aster/daisy family. It is an easy to grow and fast growing perennial that is evergreen. There are different sizes, shapes, and colors of flowers depending on cultivar. Some can get 5 feet in height. Grow in slight acidic moist soil in sun to partial sun. Propagate via division or by tip cuttings. It is hardy to USDA hardiness zones of 5 to 9.
The spiderwort (Tradescantia Andersoniana group) is from the spiderwort family. It is an easy-to-grow wetland perennial. The size of the plant will vary but most will be 1 to 2 feet in height. Flowers are 1 inch wide and different colors depending on cultivar. Grow in partial shade in moist fertile soil. Propagate via clump division every 2 to 3 years. It is hardy to USDA hardiness zones of 5 to 9.
The crocus (Crocus spp.) is from the lily family. It is a fragrant, easy-to-grow perennial. There are grass like leaves and fall blooming varieties will produce flowers in the autumn. Colors and sizes will vary according to cultivar. Grow in full sun to partial shade. Propagate via division of cormlets or by seed. It is hardy to USDA hardiness zones of 3 to 8.