Plants: T
- Tahoka Daisy Machaeranthera tanacetifolia Wildflower
- Tall Bellflower Campanulastrum americanum Wildflower
- Tall Fescue Schedonorus arundinaceus Grass
- Tall Goldenrod Solidago altissima
- Tall Green Milkweed Asclepias hirtella Wildflower
- Tall Ironweed Vernonia gigantea Wildflower
- Tall Tickseed Coreopsis tripteris Wildflower
- Tamarillo Solanum betaceum Fruiting
- Tangerine Citrus reticulata Tree fruit
- Tapertip Hawksbeard Crepis acuminata Wildflower
- Tapertip Onion Allium acuminatum Allium
- Tapioca Manihot esculenta Root
- Tarda Tulip Tulipa tarda Bulb
- Taro Colocasia esculenta Root
- Tarragon Artemisia dracunculus Herb
- Tassel Flower Emilia coccinea Garden annual
- Tassel Hyacinth Muscari comosum Bulb
- Tasteless Stonecrop Sedum sexangulare Creeping perennial
- Tatarian Aster Aster tataricus Garden perennial
- Tatsoi Brassica rapa subsp. narinosa Brassica
- Tayberry Rubus fruticosus x idaeus Berry
- Tazetta Daffodil Narcissus tazetta Bulb
- Tea Oil Camellia Camellia oleifera Nut
- Tea Olive Osmanthus fragrans Herb
- Tea Rose Rosa × odorata Flowering shrub
- Teff Eragrostis tef Grain
- Tennessee Coneflower Echinacea tennesseensis Wildflower
- Tenpetal Blazingstar Mentzelia decapetala Wildflower
- Tepary Bean Phaseolus acutifolius Legume
- Texas Bluebonnet Lupinus texensis Wildflower
- Texas Kidneywood Eysenhardtia texana Flowering shrub
- Texas Lantana Lantana urticoides Flowering shrub
- Texas Mountain Laurel Sophora secundiflora Flowering shrub
- Texas Olive Cordia boissieri Flowering shrub
- Texas Paintbrush Castilleja indivisa Wildflower
- Texas Sage Leucophyllum frutescens Flowering shrub
- Texas Sedge Carex texensis Grass sedge
- Thickleaf Beardtongue Penstemon pachyphyllus Wildflower
- Thimbleberry Rubus parviflorus Berry
- Thin-Leaved Sunflower Helianthus decapetalus Wildflower
- Thinleaf Huckleberry Vaccinium membranaceum Berry
- Thornless Blackberry Rubus fruticosus Berry
- Thornless Boysenberry Rubus ursinus x idaeus Berry
- Threadleaf Coreopsis Coreopsis verticillata Wildflower
- Threadleaf Phacelia Phacelia linearis Wildflower
- Three-Toothed Cinquefoil Sibbaldiopsis tridentata Creeping perennial
- Thryallis Galphimia glauca Flowering shrub
- Thunberg Spirea Spiraea thunbergii Flowering shrub
- Thyme Thymus vulgaris Herb
- Tickseed Sunflower Bidens aristosa Wildflower
- Tidy Tips Layia platyglossa Wildflower
- Tiger Flower Tigridia pavonia Bulb
- Tiger Lily Lilium lancifolium Garden perennial
- Titi Cyrilla racemiflora Flowering shrub
- Toad Lily Tricyrtis hirta Garden perennial
- Toadshade Trillium sessile Wildflower
- Tomatillo Physalis philadelphica Fruiting
- Tomato Solanum lycopersicum Fruiting
- Tommasini's Crocus Crocus tommasinianus Wildflower
- Torch Azalea Rhododendron kaempferi Flowering shrub
- Torch Ginger Etlingera elatior Garden perennial
- Tower of Jewels Echium wildpretii Wildflower
- Toyon Heteromeles arbutifolia Flowering shrub
- Trailing Abutilon Abutilon megapotamicum Flowering shrub
- Trailing African Daisy Osteospermum fruticosum Creeping perennial
- Trailing Arbutus Epigaea repens Creeping perennial
- Trailing Ice Plant Lampranthus spectabilis Creeping perennial
- Trailing Indigo Bush Dalea greggii
- Trailing Lantana Lantana montevidensis Creeping perennial
- Trailing Phlox Phlox nivalis Creeping perennial
- Trailing Snowberry Symphoricarpos mollis Creeping perennial
- Tree Dahlia Dahlia imperialis Garden perennial
- Tree Peony Paeonia suffruticosa Flowering shrub
- Tricolor Chrysanthemum Glebionis carinatum Garden annual
- Tropical Sage Salvia coccinea Garden perennial
- Trumpet Creeper Campsis radicans Vine
- Tube Clematis Clematis heracleifolia Flowering shrub
- Tuberose Polianthes tuberosa Garden perennial
- Tuberous Begonia Begonia × tuberhybrida Garden perennial
- Tufted Evening Primrose Oenothera caespitosa Wildflower
- Tufted Hairgrass Deschampsia cespitosa Grass
- Tufted Poppy Eschscholzia caespitosa Wildflower
- Tulip Tulipa gesneriana Bulb
- Tulip Tree Liriodendron tulipifera
- Tumbleweed Onion Allium schubertii Bulb
- Turk's Cap Malvaviscus arboreus Flowering shrub
- Turk's Cap Lily Lilium superbum Wildflower
- Turkestan Onion Allium karataviense Allium
- Turkestan Tulip Tulipa turkestanica Wildflower
- Turkish Sage Phlomis russeliana Garden perennial
- Turkish Speedwell Veronica liwanensis Creeping perennial
- Turmeric Curcuma longa Root
- Turnip Brassica rapa Root
- Turpentine Bush Ericameria laricifolia Flowering shrub
- Twinberry Honeysuckle Lonicera involucrata Flowering shrub
- Twinflower Linnaea borealis Creeping perennial
- Twinflower Dyschoriste Dyschoriste oblongifolia Creeping perennial
- Twinspur Diascia barberae Garden annual
- Two-Row Stonecrop Phedimus spurius Creeping perennial
- Twoneedle Pinyon Pinus edulis Nut