Spurge Alleghany Spurge, Fireglow 'Fireglow'
Spurge, Ghost Spurge, Griffith's 'Fireglow'
Spurge, Mexican Shrubby Spurge, Prostrate
Spurge, Red Spurge: Euphorbia 'Golden Tower'
Squash: palmata Squawbush
Squirreltail Barley St. Catherine's Lace
St. James Lily 'Superba' St. Johnswort, Golden (spp.)
St. Johnswort, Golden 'Sunburst' St. Johnswort, Kalm 'Ames'
St. Johnswort, Kalm 'Blues Festival™' 'St. Mary' American Holly
'St. Mary's Broom' Colorado Spruce St. Peter's Palm (spp.)
St. Peter's Palm 'Bright Edge' St. Peter's Palm 'Color Guard'
St. Peter's Palm 'Golden Sword' St. Peter's Palm Variegated
St.Johnswort, Bushy Staghorn Sumac (spp.)
Staghorn Sumac 'Lanciniata' Stanford Manzanita (spp.)
Stanford Manzanita: stanfordiana Star Anise (spp.)
Star Apple Star Cactus
Star Grass: colorata Star Grass: hirsuta
'Star Showers' Virginia Creeper 'Star White' Creeping Zinnia: angustifolia
'Starbright Mix' Creeping Zinnia: angustifolia 'Starfire' Summer Phlox
Stargrass, Yellow 'Starn' Coyote Bush
Steeplebush 'Sterntaler' Lanceleaf Tickseed
Stewartia, Mountain Stewartia, Silky
Stickeweed Stiff Blue Star
Stiff Goldenrod Stinking Yew
Stokes' Aster (spp.) Stokes' Aster 'Blue Danube'
Stokes' Aster 'Honeysong Purple' Stokes' Aster 'Klaus Jelitto'
Stokes' Aster 'Mary Gregory' Stokes' Aster 'Omega Skyrocket'
Stokes' Aster 'Purple Parasols' Stokes' Aster 'Silver Moon'
Stoloniferous Pussytoes 'Rubra' Stone Mountain Oak
Stone Pine Stonecrop, Corsican (spp.)
Stonecrop, Lanceleaf Stonecrop, Spearleaf
Stonecrop, Spreading Stonecrop, Wild (spp.)
Stonecrop, Wild 'Shale Barrnes' Stonecrop: spathulifolium (spp.)
Stonecrop: spathulifolium 'Cape Blanco' Stonecrop: tetratinum
Stopper, Box Leaf Stopper, Red
Stopper, Redberry Stopper, Simpson's
Stopper, Spanish Stopper: rhombea
Stopper: spp. 'Stormy Seas' Coral Bells: sanguinea
Stout Blue-eyed Grass Strangler Fig
'Strata' Mealycup Sage Strawberry Bush (spp.)
Strawberry Bush 'Athens' Strawberry Bush, Running
Strawberry Pear Strawberry, Beach (spp.)
Strawberry, Sand (spp.) Stretchberry
String Lily Striped Maple
Striped Mexican Marigold 'Lulu' Styrax, American
Subalpine Fir 'Sudwelli' American Arborvitae
'Sudworth Gold' American Arborvitae 'Suecica' Common Juniper