Quick answer: 15 native Alabama plants have a recorded bloom range that includes September.
15 species
- Big bluestem Andropogon gerardii · 25 states
- Black-eyed Susan Rudbeckia hirta · 42 states
- Blue mistflower Conoclinium coelestinum · 26 states
- Butterflyweed Asclepias tuberosa · 37 states
- Cardinal flower Lobelia cardinalis · 37 states
- Carolina jessamine Gelsemium sempervirens · 9 states
- Common yarrow Achillea millefolium · 31 states
- Eastern purple coneflower Echinacea purpurea · 22 states
- Maypop passionflower Passiflora incarnata · 13 states
- Scarlet rosemallow Hibiscus coccineus · 5 states
- Sideoats grama Bouteloua curtipendula · 25 states
- Swamp sunflower Helianthus angustifolius · 15 states
- Switchgrass Panicum virgatum · 24 states
- Trumpet vine Campsis radicans · 24 states
- Witch-hazel Hamamelis virginiana · 28 states