Quick answer: 159 native Oklahoma plants have a recorded bloom range that includes May.
159 species
- Alderleaf mountain mahogany Cercocarpus montanus · 15 states
- Allegheny chinquapin Castanea pumila · 21 states
- American basswood Tilia americana · 37 states
- American beautyberry Callicarpa americana · 13 states
- American beech Fagus grandifolia · 31 states
- American bittersweet Celastrus scandens · 33 states
- American bladdernut Staphylea trifolia · 28 states
- American hazelnut Corylus americana · 34 states
- American holly Ilex opaca · 28 states
- American hornbeam Carpinus caroliniana · 33 states
- American plum Prunus americana · 37 states
- American strawberry bush Euonymus americanus · 23 states
- Apache plume Fallugia paradoxa · 8 states
- Birdfoot violet Viola pedata · 34 states
- Black cherry Prunus serotina · 35 states
- Black oak Quercus velutina · 30 states
- Black tupelo Nyssa sylvatica · 31 states
- Black walnut Juglans nigra · 33 states
- Black willow Salix nigra · 24 states
- Blackfoot daisy Melampodium leucanthum · 6 states
- Blackjack oak Quercus marilandica · 24 states
- Blue wild indigo Baptisia australis · 23 states
- Broadleaf cattail Typha latifolia · 39 states
- Buffalograss Bouteloua dactyloides · 19 states
- Bur oak Quercus macrocarpa · 33 states
- Butterflyweed Asclepias tuberosa · 40 states
- Canada wild rye Elymus canadensis · 37 states
- Canadian wild ginger Asarum canadense · 30 states
- Cardinal flower Lobelia cardinalis · 41 states
- Chinkapin oak Quercus muehlenbergii · 30 states
- Chocolate flower Berlandiera lyrata · 6 states
- Chokecherry Prunus virginiana · 44 states
- Cinnamon fern Osmunda cinnamomea · 32 states
- Clasping coneflower Dracopis amplexicaulis · 7 states
- Climbing prairie rose Rosa setigera · 27 states
- Cockspur hawthorn Crataegus crus-galli · 25 states
- Common blue violet Viola sororia · 37 states
- Common elderberry Sambucus nigra ssp. canadensis · 36 states
- Common hackberry Celtis occidentalis · 33 states
- Common hoptree Ptelea trifoliata · 28 states
- Common ninebark Physocarpus opulifolius · 30 states
- Common persimmon Diospyros virginiana · 26 states
- Common selfheal Prunella vulgaris · 25 states
- Common yarrow Achillea millefolium · 47 states
- Coral bean Erythrina herbacea · 10 states
- Coralberry Symphoricarpos orbiculatus · 30 states
- Crossvine Bignonia capreolata · 16 states
- Cucumbertree Magnolia acuminata · 19 states
- Deerberry Vaccinium stamineum · 22 states
- Desert willow Chilopsis linearis · 5 states
- Downy hawthorn Crataegus mollis · 24 states
- Downy serviceberry Amelanchier arborea · 37 states
- Dutchman's breeches Dicentra cucullaria · 32 states
- Dwarf crested iris Iris cristata · 17 states
- Early azalea Rhododendron prinophyllum · 17 states
- Eastern bluestar Amsonia tabernaemontana · 18 states
- Eastern hop-hornbeam Ostrya virginiana · 37 states
- Eastern leatherwood Dirca palustris · 25 states
- Eastern purple coneflower Echinacea purpurea · 24 states
- Eastern red cedar Juniperus virginiana · 37 states
- Eastern red columbine Aquilegia canadensis · 36 states
- Eastern redbud Cercis canadensis · 32 states
- Farkleberry Vaccinium arboreum · 16 states
- Fire pink Silene virginica · 26 states
- Flowering dogwood Cornus florida · 31 states
- Foxglove beardtongue Penstemon digitalis · 35 states
- Fragrant sumac Rhus aromatica · 30 states
- Fringed bluestar Amsonia ciliata · 2 states
- Gambel oak Quercus gambelii · 8 states
- Golden alexanders Zizia aurea · 35 states
- Grayhead coneflower Ratibida pinnata · 26 states
- Green ash Fraxinus pennsylvanica · 43 states
- Heart-leaved meadow parsnip Zizia aptera · 30 states
- Honey locust Gleditsia triacanthos · 13 states
- Honey mesquite Prosopis glandulosa · 4 states
- Indian blanket Gaillardia pulchella · 17 states
- Indian ricegrass Achnatherum hymenoides · 17 states
- Indigo bush Amorpha fruticosa · 37 states
- Jack-in-the-pulpit Arisaema triphyllum · 35 states
- Jacob's ladder Polemonium reptans · 31 states
- Lanceleaf coreopsis Coreopsis lanceolata · 35 states
- Large penstemon (shell-leaf beardtongue) Penstemon grandiflorus · 12 states
- Large-flowered bellwort Uvularia grandiflora · 27 states
- Largeflower tickseed Coreopsis grandiflora · 25 states
- Lemon beebalm Monarda citriodora · 10 states
- Lewis flax (blue flax) Linum lewisii · 17 states
- Longbract wild indigo (cream false indigo) Baptisia bracteata var. leucophaea · 19 states
- Low prickly pear Opuntia humifusa · 31 states
- Lyreleaf sage Salvia lyrata · 22 states
- Mayapple Podophyllum peltatum · 35 states
- Maypop passionflower Passiflora incarnata · 21 states
- Mexican hat Ratibida columnifera · 17 states
- Narrow-leaf coneflower Echinacea angustifolia · 11 states
- New Jersey tea Ceanothus americanus · 35 states
- Northern red oak Quercus rubra · 33 states
- Northern spicebush Lindera benzoin · 31 states
- Ohio buckeye Aesculus glabra · 20 states
- Pale purple coneflower Echinacea pallida · 17 states
- Partridgeberry Mitchella repens · 31 states
- Pawpaw Asimina triloba · 29 states
- Pin oak Quercus palustris · 27 states
- Pincushion daisy (perfumeballs) Gaillardia suavis · 1 states
- Pink evening primrose Oenothera speciosa · 8 states
- Plains coreopsis Coreopsis tinctoria · 16 states
- Ponderosa pine Pinus ponderosa · 16 states
- Possumhaw Ilex decidua · 17 states
- Post oak Quercus stellata · 28 states
- Prairie Junegrass Koeleria macrantha · 29 states
- Prairie blue-eyed grass Sisyrinchium campestre · 11 states
- Prairie crabapple Malus ioensis · 15 states
- Purple meadow-rue Thalictrum dasycarpum · 17 states
- Rattlesnake master Eryngium yuccifolium · 20 states
- Red buckeye Aesculus pavia · 15 states
- Red chokeberry Aronia arbutifolia · 22 states
- Richardson's alumroot Heuchera richardsonii · 11 states
- Rocky Mountain bee plant Peritoma serrulata · 26 states
- Rough coneflower Rudbeckia grandiflora · 1 states
- Roughleaf dogwood Cornus drummondii · 11 states
- Royal fern Osmunda regalis var. spectabilis · 30 states
- Rusty blackhaw viburnum Viburnum rufidulum · 18 states
- Sassafras Sassafras albidum · 22 states
- Scarlet globemallow Sphaeralcea coccinea · 12 states
- Scarlet sage Salvia coccinea · 3 states
- Shagbark hickory Carya ovata · 34 states
- Showy milkweed Asclepias speciosa · 17 states
- Shumard oak Quercus shumardii · 22 states
- Smooth Solomon's seal Polygonatum biflorum · 34 states
- Smooth hydrangea Hydrangea arborescens · 23 states
- Smooth sumac Rhus glabra · 42 states
- Southern red oak Quercus falcata · 23 states
- Spotted beebalm Monarda punctata · 29 states
- Standing cypress Ipomopsis rubra · 6 states
- Stiff greenthread Thelesperma filifolium · 1 states
- Sugar maple Acer saccharum · 34 states
- Sweetgum Liquidambar styraciflua · 26 states
- Texas bluebonnet (state flower) Lupinus texensis · 2 states
- Texas star (prairie rose-gentian) Sabatia campestris · 1 states
- Three-flower melic grass Melica nitens · 17 states
- Virginia creeper Parthenocissus quinquefolia · 40 states
- Virginia iris Iris virginica · 26 states
- Virginia springbeauty Claytonia virginica · 28 states
- Virginia strawberry Fragaria virginiana · 30 states
- Virginia sweetspire Itea virginica · 19 states
- Water oak Quercus nigra · 17 states
- Western yarrow Achillea millefolium var. occidentalis · 18 states
- White ash Fraxinus americana · 35 states
- White baneberry Actaea pachypoda · 33 states
- White fringetree Chionanthus virginicus · 21 states
- White wild indigo Baptisia alba · 23 states
- Whorled milkweed Asclepias verticillata · 30 states
- Wild blue phlox Phlox divaricata · 36 states
- Wild geranium Geranium maculatum · 33 states
- Wild hyacinth (Atlantic camas) Camassia scilloides · 20 states
- Willow oak Quercus phellos · 23 states
- Winecup Callirhoe involucrata · 16 states
- Winterfat Krascheninnikovia lanata · 12 states
- Woodland pinkroot Spigelia marilandica · 16 states
- Woolly paperflower Psilostrophe tagetina · 7 states
- Yaupon holly Ilex vomitoria · 11 states
May in an Oklahoma native garden
May is Oklahoma's peak bloom month: 159 of the state's 247 native plants in this directory flower in May, more than in any other month.
42 start blooming in May, including American beautyberry, American bittersweet and American strawberry bush. 47 finish in May, including Alderleaf mountain mahogany, American beech and American hornbeam, so this is the last chance to see them in flower.
106 of them grow in full or partial sun and 93 tolerate shade, so there are options for open beds and woodland edges alike. Sizes run from low plants like Birdfoot violet and Buffalograss to trees such as Alderleaf mountain mahogany and Allegheny chinquapin. For wildlife, 129 support pollinators, 94 provide food or cover for birds and 54 are caterpillar host plants.
127 of the 159 have a seed or plant listing we verified as the wild species. Be careful buying Apache plume, Common yarrow, Crossvine: 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.
- Chokecherry Prunus virginiana · Sun, Part Shade, Shade · blooms Apr-Jul
- Green ash Fraxinus pennsylvanica · Sun, Part Shade, Shade · blooms Apr-Jun
- Smooth sumac Rhus glabra · Sun, Part Shade, Shade · blooms May-Aug