Quick answer: 23 native Mississippi plants have a recorded bloom range that includes September.
23 species
- Big bluestem Andropogon gerardii · 25 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
- Cutleaf coneflower Rudbeckia laciniata · 21 states
- Devil's walking stick Aralia spinosa · 14 states
- Eastern purple coneflower Echinacea purpurea · 22 states
- Great blue lobelia Lobelia siphilitica · 32 states
- Hollow Joe-pye weed Eutrochium fistulosum · 14 states
- Longleaf pine Pinus palustris · 6 states
- Mexican hat Ratibida columnifera · 17 states
- Pink-scale blazing star Liatris elegans · 5 states
- Prairie blazing star Liatris pycnostachya · 16 states
- Scarlet rosemallow Hibiscus coccineus · 5 states
- Sideoats grama Bouteloua curtipendula · 25 states
- Spotted beebalm Monarda punctata · 14 states
- Stokes aster Stokesia laevis · 4 states
- Swamp sunflower Helianthus angustifolius · 15 states
- Switchgrass Panicum virgatum · 24 states
- Trumpet vine Campsis radicans · 24 states
- Witch-hazel Hamamelis virginiana · 28 states