Soldier Boy Soldier Boy: orthopetala
Soldier Boy: pallida Soldier Boys Golden
Solomon's Seal Solomon's Seal 'Bill Baker Form'
Solomon's Seal (spp.) Solomon's Seal, Dwarf
Solomon's Seal, Scented (spp.) Solomon's Seal, Scented Variegated
Solomon's Seal: humile, Dwarf Somali Hemp
'Sombrero' Common Zinnia 'Something Different' Hosta
'Sonata White' Garden Cosmos 'Song Sparrow' Daylily
'Sonnet Crimson' Snapdragon 'Sonora' Black-eyed Susan
'Sooner Gold' Daylily 'Soraya' Common Sunflower
'Sorbet Orange Duet' Horned Violet Sorrel, Four Leaf
Sotol, Common Sotol, Narrow-Leaf
Soup Mint (spp.) Sour Dock
'Sour Grapes' Bearded Tongue: Penstemon South African Acanthus
'Southern Belle' Rose Mallow Southern Blue Flag 'Purple Fan'
'Southern Comfort' Alumroot: Heuchera Southern Lady Fern (spp.)
Southern Lady Fern 'Veronica-Cristata' Southern Maidenhair Fern
Southern Red Trillium Southern Star
Southern Sundrops Southern Wood Fern
Southern Wood Fern: normalis Southern Woodland Penstemon
Southwestern Cosmos (spp.) Southwestern Cosmos 'Early Wonder'
Southwestern Cosmos 'Sonata White' Sowbread
'Space Wars' Daylily Spanglegrass
Spanglegrass River Oats Spanish Bayonet (spp.)
Spanish Bayonet 'Marginata' Spanish Bayonet Variegated
Spanish Bluebells (spp.) Spanish Bluebells 'White City'
Spanish Chamomile Spanish Dagger (spp.)
Spanish Dagger 'Marginata' Spanish Dagger Variegated
Spanish Flag (spp.) Spanish Flag 'Citronella'
Spanish Iris (spp.) Spanish Moss
Spanish Needle 'Golden Eye' Spanish Needle 'Golden Goddess'
Spanish Needle 'Marietta Gold Spark' Spanish Needle 'Summerlovers Biden 1850'
Spanish Reed Grass (spp.) Spanish Reed Grass 'Picta'
Spanish Reed Grass Variegated Spanish Shawl
Spanish Thyme (spp.) Spanish Yucca
'Sparkle Devine' Cardinal Flower 'Sparkler' African Daisy: Osteospermum
'Sparkler Mix' Spider Plant: hassleriana Sparkler Sedge 'Sparkler'
'Sparkler' Sparkler Sedge 'Sparkling Burgundy' Pineapple Lily
'Sparkling Cheryl' Florist's Chrysanthemum Spatterdock
Spear Grass Spear Grass: colensoi
Spear Grass: tenuissima Spearleaf Stonecrop
Spearmint 'Kentucky Colonel' Spearwort, Greater Creeping
Spearwort, Lesser 'Speciosa (Firetail)' Knotweed: amplexicaule
'Speciosum' Sacred Lotus Speckled Wood Lily