Quick answer: 76 native Oklahoma plants have a recorded bloom range that includes September.
76 species
- Apache plume Fallugia paradoxa · 8 states
- Big bluestem Andropogon gerardii · 41 states
- Black-eyed Susan Rudbeckia hirta · 44 states
- Blackfoot daisy Melampodium leucanthum · 6 states
- Blue grama Bouteloua gracilis · 19 states
- Blue mistflower Conoclinium coelestinum · 32 states
- Blue vervain Verbena hastata · 34 states
- Buffalograss Bouteloua dactyloides · 19 states
- Butterflyweed Asclepias tuberosa · 40 states
- Cardinal flower Lobelia cardinalis · 41 states
- Chocolate flower Berlandiera lyrata · 6 states
- Common buttonbush Cephalanthus occidentalis · 29 states
- Common evening primrose Oenothera biennis · 30 states
- Common selfheal Prunella vulgaris · 25 states
- Common sneezeweed Helenium autumnale · 40 states
- Common sunflower Helianthus annuus · 18 states
- Common yarrow Achillea millefolium · 47 states
- Compass plant Silphium laciniatum · 20 states
- Crimson-eyed rose-mallow Hibiscus moscheutos · 28 states
- Culver's root Veronicastrum virginicum · 32 states
- Cup plant Silphium perfoliatum · 27 states
- Cutleaf coneflower Rudbeckia laciniata · 43 states
- Desert willow Chilopsis linearis · 5 states
- Devil's walking stick Aralia spinosa · 21 states
- Dotted blazing star Liatris punctata · 17 states
- Eastern purple coneflower Echinacea purpurea · 24 states
- Fall obedient plant Physostegia virginiana · 37 states
- Flowering spurge Euphorbia corollata · 29 states
- Grayhead coneflower Ratibida pinnata · 26 states
- Great blue lobelia Lobelia siphilitica · 36 states
- Hollow Joe-pye weed Eutrochium fistulosum · 24 states
- Honey mesquite Prosopis glandulosa · 4 states
- Hooker's evening primrose Oenothera elata · 14 states
- Indiangrass Sorghastrum nutans · 37 states
- Inland sea oats Chasmanthium latifolium · 21 states
- Little bluestem Schizachyrium scoparium · 42 states
- Maximilian sunflower Helianthus maximiliani · 3 states
- Maypop passionflower Passiflora incarnata · 21 states
- Mexican hat Ratibida columnifera · 17 states
- New England aster Symphyotrichum novae-angliae · 29 states
- Orange coneflower Rudbeckia fulgida · 23 states
- Partridge pea Chamaecrista fasciculata · 30 states
- Partridgeberry Mitchella repens · 31 states
- Pink-scale blazing star Liatris elegans · 9 states
- Prairie blazing star Liatris pycnostachya · 19 states
- Prairie ironweed Vernonia fasciculata · 14 states
- Purple prairie clover Dalea purpurea · 18 states
- Rocky Mountain bee plant Peritoma serrulata · 26 states
- Rocky Mountain zinnia Zinnia grandiflora · 6 states
- Roundhead lespedeza Lespedeza capitata · 30 states
- Rubber rabbitbrush Ericameria nauseosa · 17 states
- Scaly blazing star Liatris squarrosa · 22 states
- Scarlet gilia Ipomopsis aggregata · 13 states
- Scarlet globemallow Sphaeralcea coccinea · 12 states
- Scarlet sage Salvia coccinea · 3 states
- Showy goldenrod Solidago speciosa · 28 states
- Showy tick trefoil Desmodium canadense · 29 states
- Sideoats grama Bouteloua curtipendula · 38 states
- Smooth oxeye Heliopsis helianthoides · 30 states
- Spotted beebalm Monarda punctata · 29 states
- Swamp milkweed Asclepias incarnata · 37 states
- Swamp sunflower Helianthus angustifolius · 21 states
- Sweet Joe-Pye Eutrochium purpureum · 33 states
- Sweet coneflower Rudbeckia subtomentosa · 11 states
- Switchgrass Panicum virgatum · 43 states
- Tall blazing star Liatris aspera · 26 states
- Trumpet vine Campsis radicans · 33 states
- Western ironweed Vernonia baldwinii · 1 states
- Western yarrow Achillea millefolium var. occidentalis · 18 states
- White heath aster Symphyotrichum ericoides var. ericoides · 26 states
- White snakeroot Ageratina altissima · 23 states
- Wholeleaf rosinweed Silphium integrifolium · 16 states
- Whorled milkweed Asclepias verticillata · 30 states
- Witch-hazel Hamamelis virginiana · 33 states
- Woolly paperflower Psilostrophe tagetina · 7 states
- Yellow passionflower Passiflora lutea · 21 states
September in an Oklahoma native garden
September is a quieter month in Oklahoma: 76 of the state's 247 native plants flower in September, compared with 159 at the May peak. That makes these plants valuable for keeping color, and food for pollinators, going outside the main season.
2 start blooming in September, including White heath aster and Witch-hazel. 35 finish in September, including Blue vervain, Butterflyweed and Common buttonbush, so this is the last chance to see them in flower.
63 of them grow in full or partial sun and 22 tolerate shade, so there are options for open beds and woodland edges alike. Sizes run from low plants like Black-eyed Susan and Buffalograss to trees such as Desert willow and Devil's walking stick. For wildlife, 69 support pollinators, 46 provide food or cover for birds and 25 are caterpillar host plants.
62 of the 76 have a seed or plant listing we verified as the wild species. Be careful buying Apache plume, Black-eyed Susan, Common yarrow: common listings for these are often a bred variety or a different species.
Good places to start
Verified wild-species listings that take sun and are widely native, so they are forgiving first plants.
- Cutleaf coneflower Rudbeckia laciniata · Sun, Part Shade, Shade · blooms Jul-Oct
- Little bluestem Schizachyrium scoparium · Sun, Part Shade · blooms Jun-Dec
- Big bluestem Andropogon gerardii · Sun, Part Shade · blooms Aug-Nov