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Sagae Hosta	Hosta 'Sagae'
Sailor Boy New York Aster	Aster novi-belgii 'Sailor Boy'
Samurai Hosta	Hosta 'Samurai'
Sand Coreopsis	Coreopsis lanceolata
Sarcoxie Euonymus	Euonymus fortunei 'Sarcoxie'
Sargent Cherry	Prunus sargentii
Sargent Crab	Malus sargentii
Sargent Juniper	Juniperus chinensis var. sargentii
Sargent Viburnum	Viburnum sargentii
Sassafras	Sassafras albidum
Saucer Magnolia	Magnolia x soulangiana
Sawara False Cypress	Chamaecyparis pisifera 'Filifera'
Sawtooth Oak	Quercus acutissima
Scarlet Oak	Quercus coccinea
Scarlet Orbit Daylily	Hemerocallis 'Scarlet Orbit'
Schottland Tufted Hair Grass	Deschampsia caespitosa 'Schottland'
Schubert (Canada Red) Cherry	Prunus virginiana 'Schubert'
Scotch Pine	Pinus sylvestris
Sea Foam Rose	Rosa 'Sea Foam'
Sea Green Juniper	Juniperus chinensis 'Sea Green'
Sea Lavender	Limonium latifolium
Sensation Lilac	Syringa vulgaris 'Sensation'
Sensitive Fern	Onoclea sensibilis
Sentimental Blue Balloon Flower	Platycodon grandiflorus 'Sentimental Blue'
September Charm Windflower	Anemone x hybrida 'September Charm'
Serbian Bellflower	Campanula poscharskyana
Serbian Spruce	Picea omorika
Seven Son Flower	Heptacodium miconoides
Shadblow Serviceberry	Amelanchier canadensis
Shade Fanfare	Hosta 'Shade Fanfare'
Shademaster Honeylocust	Gleditsia triacanthos var. inermis 'Shademaster'
Shagbark Hickory	Carya ovata
Shantung Maple	Acer truncatum
Shavalski's Ligularia	Ligularia przewalskii
Shawnee Brave Bald Cypress	Taxodium distichum 'Shawnee Brave'
Shell Pink Balloon Flower	Platycodon grandiflorus 'Shell Pink'
Shell Pink Spotted Deadnettle	Lamium maculatum 'Shell Pink'
Shenandoah Red Switch Grass	Panicum virgatum 'Shenandoah'
Shieldleaf Rodger's Flower	Rodgersia tabularis
Shingle Oak	Quercus imbricaria
Shirobana Spirea	Spiraea japonica 'Shirobana'
Shortwood Garden Phlox	Phlox paniculata 'Shortwood'
Shredded Sumac	Rhus typhina 'Laciniata'
Shrubby St. Johnswort	Hypericum prolificum
Siberian Dogwood	Cornus alba 'Siberian Pearls'
Siebold Viburnum	Viburnum sieboldii
Siloam June Bug Daylily	Hemerocallis 'Siloam June Bug'
Silver Blade™ Ozark Sundrops	Oenothera macrocarpa 'Silver Blade'
Silver Carpet Lamb's Ear	Stachys byzantina 'Silver Carpet'
Silver Edge Pachysandra	Pachysandra terminalis 'Silver Edge'
Silver Frost Butterfly Bush	Buddleia davidii 'Silver Frost'
Silver Lace Vine	Polygonum aubertii
Silver Linden	Tilia tomentosa
Silver Maple	Acer saccharinum
Silver Sage	Salvia argentia
Silvermound Artemisia	Artemisia schmidtiana 'Silvermound'
Silvery Glade Fern	Athyrium thelypterioides
Sissinghurst White Lungwort	Pulmonaria officinalis 'Sissinghurst White'
Six Hills Giant Cat Mint	Nepeta x faassenii 'Six Hills Giant'
Skeleton Key Foamflower	Tiarella 'Skeleton Key'
Sky Blue Aster	Aster azureus
Skyline Honeylocust	Gleditsia triacanthos var. inermis 'Skyline'
Skyrocket Juniper	Juniperus scopulorum 'Skyrocket'
Slender Deutzia	Deutzia gracilis
Small Globethistle	Echinops ritro
Small Leaf Lilac	Syringa microphylla
Small-flowered Tamarisk	Tamarix parviflora
Smoke Bush	Cotinus coggygria
Smooth Blue Aster	Aster laevis
Smooth Witherod	Viburnum nudum 'Winterthur'
Snow Angel Coral Bells	Heuchera 'Snow Angel'
Snow Cushion New York Aster	Aster novi-belgii 'Schneekissen'
Snow Flurry Aster	Aster ericoides 'Snow Flurry'
Snow Hill Sage	Salvia x superba 'Snow Hill'
Snow Queen Oak Leaf Hydrangea	Hydrangea quercifolia 'Snow Queen'
Snowbank False Chamomile	Boltonia asteroides 'Snowbank'
Snowcap Spiderwort	Tradescantia 'Snowcap'
Snowdrift Crab	Malus 'Snowdrift'
Snowdrop Anemone	Anemone sylvestris
Snowfall Ninebark	Physocarpus opulifolius 'Snowfall'
Snowflake Candytuft	Iberis sempervirens 'Snowflake'
Snowflake Cat Mint	Nepeta x faassenii 'Snowflake'
Snow-in-Summer	Cerastium tomentosum
Snowmound Spirea	Spiraea nipponica 'Snowmound'
So Sweet Hosta	Hosta 'So Sweet'
Solar Flare Hosta	Hosta 'Solar Flare'
Sour Gum	Nyssa sylvatica
Southernwood Artemisia	Artemisia abrotanum
Sparkle Berry	Berberis thunbergii 'Sparkle'
Spice Bush	Lindera benzoin
Spike Gayfeather	Liatris spicata 'Kobald'
Spinulose Wood Fern	Dryopteris spinulosa
Spiral Juniper	Juniperus (special form)
Spitfire Quince	Chaenomeles speciosa 'Spitfire'
Spotted Geranium	Geranium maculatum
Spotted Joe Pye Weed	Eupatorium maculatum
Spreading Cotoneaster	Cotoneaster divaricatus
Spring Snow Crab	Malus 'Spring Snow'
Spring Symphony Foamflower	Tiarella 'Spring Symphony'
Sprite Astilbe	Astilbe simplicifolia 'Sprite'
Sprite Daylily	Hemerocallis 'Sprite'
Squash Casserole Hosta	Hosta 'Squash Casserole'
St. Mary's Broom Colorado Spruce	Picea pungens 'St. Mary's Broom'
St. Ola Cambridge Geranium	Geranium x cantabrigiense 'St. Ola'
Staghorn Sumac	Rhus typhina
Star Magnolia	Magnolia stellata
Starfire Garden Phlox	Phlox paniculata 'Starfire'
Starry Solomon's Seal	Smilacina stellata
State Street Maple	Acer miyabei 'Morton'
Stella de Oro Daylily	Hemerocallis 'Stella de Oro'
Sterling Star Asiatic Lily	Lilium 'Sterling Star'
Sternhimmel Garden Phlox	Phlox paniculata 'Sternhimmel'
Stinking Hellebore	Helleborus foetidus
Strawberry Candy Coral Bells	Heuchera 'Strawberry Candy'
Strawberry Candy Daylily	Hemerocallis 'Strawberry Candy'
Strawberry Parfait Crab	Malus 'Strawberry Parfait'
Striped Blood Red Geranium	Geranium sanguineum 'Lancastriense'
Striped Stonecrop	Sedum alboroseum 'Mediovariegatum'
Sugar Maple	Acer saccharum
Sugar Tyme Crab	Malus 'Sugar Tyme'
Sulphureum Bishop's Cap	Epimedium x versicolor 'Sulphureum'
Sultana Hosta	Hosta 'Sultana'
Sum and Substance Hosta	Hosta 'Sum and Substance'
Summer Beauty Butterfly Bush	Buddleia davidii 'Summer Beauty'
Summer Music Hosta	Hosta 'Summer Music'
Summer Sun False Sunflower	Heliopsis helianthoides 'Summer Sun'
Summer Wine Daylily	Hemerocallis 'Summer Wine'
Summer Wine Ninebark	Physocarpus opulifolius 'Seward'
Summersweet	Clethra alnifolia
Summit Seedless Green Ash	Fraxinus pennsylvanica 'Summit'
Sun Gold Cypress	Chamaecyparis pisifera 'Sun Gold'
Sun Power Hosta	Hosta 'Sun Power'
Sunburst St. Johnswort	Hypericum frondosum 'Sunburst'
Sundrops	Oenothera tetragona
Sunny Border Blue Spiked Veronica	Veronica spicata 'Sunny Border Blue'
Sunray Coreopsis	Coreopsis 'Sunray'
Sunrise Forsythia	Forsythia 'Sunrise'
Sunset Cloud Sedum	Sedum 'Sunset Cloud'
Susan Magnolia	Magnolia 'Susan'
Swamp White Oak	Quercus bicolor
Sweet Autumn Clematis	Clematis terniflora
Sweet Black Eyed Susan	Rudbeckia subtomentosa
Sweet Dreams Pink Coreopsis	Coreopsis x rosea 'Sweet Dreams'
Sweet Iris (Variegated Iris)	Iris pallida 'Variegata'
Sweet Joe Pye Weed	Eupatorium purpureum
Sweet Kate Spiderwort	Tradescantia 'Sweet Kate'
Sweet Woodruff	Gallium odoratum
Sweetgum	Liquidambar styraciflua
Switch Grass	Panicum virgatum
Switzerland Shasta Daisy	Leucanthemum superbum 'Switzerland'