To warm up chilly fall days, select fall flowers with hot-colored blooms. Autumn blooming flowers need a lot of sunlight--at least 6 hours of sun a day. Move your flower pots around as the angle of the sun moves as the day grow shorter. Purchase small plants of fall-blooming perennials in the spring. Create a potting mix of equal parts composted bark, peat moss, compost and perlite. Use water-soluble fertilizer every two weeks during the growing season. Spray the foliage with cool chamomile tea once a week in the late afternoon, beginning around midsummer, to avoid powdery mildew.
Chrysanthemum "Vampire" grows 18 to 24 inches tall with rich, red flowers on strong stems. It blooms from late summer through fall. For the best autumn blossoms, pinch the plant tips back two or three times in the spring. Chrysanthemums need average water and full sun. This flower does well in a plant pot and makes a great cut flower.
Dahlia hybrids grow 1 to 5 feet tall. They produce red, pink, orange, yellow, purple or white flowers, surrounded by green or reddish leaves. Plant young dahlias 4 inches deep in full sun. The taller varieties need to be supported or they will fall over during autumn storms.
Gazania "Daybreak Red Stripe" grows to a height of 6 to 10 inches. It displays wide, yellow daisy-like flowers--streaked with red--in the fall. They need full sun and lots of water during the growing season. Pinch off dying blooms to prolong the flowering season.
Salvia x sylvestris "May Night" grows to be 18 to 24 inches tall. It produces violet-purple upright flower spikes with clusters of blossoms blooming from late spring to late summer. This flower has narrow green foliage and loves regions with hot summers. It needs well-drained soil, infrequent watering and full sun.
Lobelia erinus "Sapphire" grows 3 to 6 inches in height with green mounds of foliage. This plant has many small bright blue flowers with white throats. It requires full sunlight and an average amount of water.