Quick answer: 119 native Georgia plants have a recorded bloom range that includes May.
119 species
- Adam's needle Yucca filamentosa · 2 states
- American alumroot Heuchera americana · 1 states
- American beautyberry Callicarpa americana · 10 states
- American beech Fagus grandifolia · 24 states
- American bittersweet Celastrus scandens · 11 states
- American bladdernut Staphylea trifolia · 15 states
- American hazelnut Corylus americana · 16 states
- American holly Ilex opaca · 24 states
- American hornbeam Carpinus caroliniana · 29 states
- American olive Osmanthus americanus · 4 states
- American smoketree Cotinus obovatus · 2 states
- American wisteria Wisteria frutescens · 14 states
- Bigleaf magnolia Magnolia macrophylla · 5 states
- Birdfoot violet Viola pedata · 14 states
- Black tupelo Nyssa sylvatica · 19 states
- Black walnut Juglans nigra · 33 states
- Blue wild indigo Baptisia australis · 6 states
- Bristly locust Robinia hispida · 9 states
- Butterflyweed Asclepias tuberosa · 37 states
- Cardinal flower Lobelia cardinalis · 37 states
- Carolina allspice Calycanthus floridus · 5 states
- Carolina jessamine Gelsemium sempervirens · 9 states
- Cinnamon fern Osmunda cinnamomea · 13 states
- Common elderberry Sambucus nigra ssp. canadensis · 16 states
- Common hackberry Celtis occidentalis · 15 states
- Common hoptree Ptelea trifoliata · 12 states
- Common ninebark Physocarpus opulifolius · 22 states
- Common persimmon Diospyros virginiana · 17 states
- Common winterberry Ilex verticillata · 10 states
- Coral bean Erythrina herbacea · 6 states
- Coral honeysuckle Lonicera sempervirens · 16 states
- Creeping phlox Phlox subulata · 11 states
- Crossvine Bignonia capreolata · 5 states
- Cucumbertree Magnolia acuminata · 12 states
- Deerberry Vaccinium stamineum · 10 states
- Downy serviceberry Amelanchier arborea · 34 states
- Dwarf fothergilla Fothergilla gardenii · 9 states
- Dwarf palmetto Sabal minor · 3 states
- Eastern bluestar Amsonia tabernaemontana · 8 states
- Eastern hop-hornbeam Ostrya virginiana · 18 states
- Eastern purple coneflower Echinacea purpurea · 22 states
- Eastern red cedar Juniperus virginiana · 36 states
- Eastern red columbine Aquilegia canadensis · 36 states
- Eastern redbud Cercis canadensis · 30 states
- Eastern white pine Pinus strobus · 19 states
- Farkleberry Vaccinium arboreum · 5 states
- Fevertree Pinckneya bracteata · 1 states
- Fire pink Silene virginica · 8 states
- Flame azalea Rhododendron calendulaceum · 12 states
- Florida anisetree Illicium floridanum · 1 states
- Flowering dogwood Cornus florida · 22 states
- Foxglove beardtongue Penstemon digitalis · 31 states
- Fragrant sumac Rhus aromatica · 14 states
- Green ash Fraxinus pennsylvanica · 23 states
- Green-and-gold Chrysogonum virginianum · 1 states
- Highbush blueberry Vaccinium corymbosum · 4 states
- Indian blanket Gaillardia pulchella · 18 states
- Indigo bush Amorpha fruticosa · 16 states
- Jack-in-the-pulpit Arisaema triphyllum · 14 states
- Kentucky yellowwood Cladrastis kentukea · 1 states
- Lanceleaf coreopsis Coreopsis lanceolata · 28 states
- Loblolly bay Gordonia lasianthus · 5 states
- Longleaf pine Pinus palustris · 6 states
- Mapleleaf viburnum Viburnum acerifolium · 5 states
- Maypop passionflower Passiflora incarnata · 13 states
- Mountain silverbell Halesia tetraptera · 1 states
- Mountain witch-alder Fothergilla major · 7 states
- Narrowleaf blue-eyed grass Sisyrinchium angustifolium · 2 states
- Narrowleaf evening-primrose Oenothera fruticosa · 10 states
- New Jersey tea Ceanothus americanus · 31 states
- Northern red oak Quercus rubra · 24 states
- Northern spicebush Lindera benzoin · 16 states
- Pagoda dogwood Cornus alternifolia · 25 states
- Pin oak Quercus palustris · 18 states
- Pink evening primrose Oenothera speciosa · 8 states
- Plains coreopsis Coreopsis tinctoria · 16 states
- Possumhaw Ilex decidua · 7 states
- Red baneberry Actaea rubra · 22 states
- Red buckeye Aesculus pavia · 9 states
- Red chokeberry Aronia arbutifolia · 7 states
- Redbay Persea borbonia · 1 states
- Rusty blackhaw viburnum Viburnum rufidulum · 12 states
- Sassafras Sassafras albidum · 22 states
- Saw palmetto Serenoa repens · 2 states
- Scarlet oak Quercus coccinea · 17 states
- Shagbark hickory Carya ovata · 22 states
- Shumard oak Quercus shumardii · 5 states
- Silky camellia Stewartia malacodendron · 2 states
- Smooth hydrangea Hydrangea arborescens · 12 states
- Smooth sumac Rhus glabra · 34 states
- Sourwood Oxydendrum arboreum · 14 states
- Southern arrowwood Viburnum dentatum · 13 states
- Southern crabapple Malus angustifolia · 2 states
- Southern live oak Quercus virginiana · 13 states
- Southern magnolia Magnolia grandiflora · 10 states
- Southern red oak Quercus falcata · 6 states
- Spotted beebalm Monarda punctata · 14 states
- Stokes aster Stokesia laevis · 4 states
- Sugar maple Acer saccharum · 28 states
- Sundial lupine Lupinus perennis · 25 states
- Sweetbay magnolia Magnolia virginiana · 12 states
- Sweetgum Liquidambar styraciflua · 22 states
- Titi cyrilla Cyrilla racemiflora · 5 states
- Tulip tree Liriodendron tulipifera · 17 states
- Twinleaf Jeffersonia diphylla · 1 states
- Two-wing silverbell Halesia diptera · 5 states
- Virginia creeper Parthenocissus quinquefolia · 27 states
- Virginia spiderwort Tradescantia virginiana · 2 states
- Virginia sweetspire Itea virginica · 6 states
- Water oak Quercus nigra · 4 states
- White ash Fraxinus americana · 31 states
- White fringetree Chionanthus virginicus · 14 states
- White oak Quercus alba · 33 states
- White wild indigo Baptisia alba · 10 states
- Wild blue Phlox divaricata · 32 states
- Wild geranium Geranium maculatum · 11 states
- Willow oak Quercus phellos · 16 states
- Yaupon holly Ilex vomitoria · 7 states
- Yellow buckeye Aesculus flava · 3 states