Quick answer: 92 native Oklahoma plants have a recorded bloom range that includes August.
92 species
- American bellflower Campanulastrum americanum · 34 states
- 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
- Fire pink Silene virginica · 26 states
- Flowering spurge Euphorbia corollata · 29 states
- Golden alexanders Zizia aurea · 35 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
- Indian blanket Gaillardia pulchella · 17 states
- Indiangrass Sorghastrum nutans · 37 states
- Inland sea oats Chasmanthium latifolium · 21 states
- Lewis flax (blue flax) Linum lewisii · 17 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
- Michigan lily Lilium michiganense · 16 states
- New England aster Symphyotrichum novae-angliae · 29 states
- New Jersey tea Ceanothus americanus · 35 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 dropseed Sporobolus heterolepis · 19 states
- Prairie ironweed Vernonia fasciculata · 14 states
- Prairie tickseed Coreopsis palmata · 10 states
- Purple prairie clover Dalea purpurea · 18 states
- Rattlesnake master Eryngium yuccifolium · 20 states
- Rocky Mountain bee plant Peritoma serrulata · 26 states
- Rocky Mountain zinnia Zinnia grandiflora · 6 states
- Rough coneflower Rudbeckia grandiflora · 1 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
- Seaside alder Alnus maritima · 3 states
- Showy goldenrod Solidago speciosa · 28 states
- Showy milkweed Asclepias speciosa · 17 states
- Showy tick trefoil Desmodium canadense · 29 states
- Shrubby St. John's-wort Hypericum prolificum · 33 states
- Sideoats grama Bouteloua curtipendula · 38 states
- Smooth hydrangea Hydrangea arborescens · 23 states
- Smooth oxeye Heliopsis helianthoides · 30 states
- Smooth sumac Rhus glabra · 42 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
- Virginia mountain mint Pycnanthemum virginianum · 27 states
- Western ironweed Vernonia baldwinii · 1 states
- Western yarrow Achillea millefolium var. occidentalis · 18 states
- White snakeroot Ageratina altissima · 23 states
- Wholeleaf rosinweed Silphium integrifolium · 16 states
- Whorled milkweed Asclepias verticillata · 30 states
- Winged sumac Rhus copallinum · 30 states
- Woolly paperflower Psilostrophe tagetina · 7 states
- Yellow passionflower Passiflora lutea · 21 states
August in an Oklahoma native garden
August is a quieter month in Oklahoma: 92 of the state's 247 native plants flower in August, compared with 159 at the May peak. That makes these plants valuable for keeping color, and food for pollinators, going outside the main season.
14 start blooming in August, including Big bluestem, Dotted blazing star and Indiangrass. 18 finish in August, including American bellflower, Fire pink and Golden alexanders, so this is the last chance to see them in flower.
73 of them grow in full or partial sun and 30 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, 85 support pollinators, 49 provide food or cover for birds and 28 are caterpillar host plants.
74 of the 92 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
- Smooth sumac Rhus glabra · Sun, Part Shade, Shade · blooms May-Aug