'Streaker' Daylily 'Striata' Lily of the Valley
'Stricta' Feather Reed Grass 'Strictus' Maiden Grass
'Strike it Rich' Tall Bearded German Iris String Lily
String of Hearts Stringy Stonecrop
Striped Loosestrife Striped Mexican Marigold 'Lemon Gem'
Striped Mexican Marigold 'Lulu' 'Striptease' Hosta
Succory (spp.) Succory 'Marina'
Succulent Bush Senecio Succulent Lupine
'Sue Rothbauer' Daylily 'Sugar and Cream' Hosta: Hosta
Sugar Cane, Purple Sugar Scoop 'Adagio'
Sugar Scoop 'Black Velvet' Sugar Scoop 'Crow Feather'
Sugar Scoop 'Cygnet' Sugar Scoop 'Freckles'
Sugar Scoop 'Heronswood Mist' Sugar Scoop 'Iron Butterfly'
Sugar Scoop 'Lacquer Leaf' Sugar Scoop 'Lavid of Skye'
Sugar Scoop 'Mint Chocolate' Sugar Scoop 'Pink Brushes'
Sugar Scoop 'Pink Pearls' Sugar Scoop 'Pinwheel'
Sugar Scoop 'Skeleton Key' Sugar Scoop 'Spring Symphony'
Sugar Scoop 'Tiger Stripe' Sugarbush, Common
Sugarbush, Common 'Clarks Red' Sugarcane
'Sulfur' Sweet Potato Vine Sulphur Buckwheat (spp.)
Sulphur Buckwheat 'Arizona Sun' Sulphur Buckwheat: umbellatum
Sulphur Cosmos (spp.) Sulphur Cosmos 'Cosmic Orange'
Sulphur Cosmos 'Cosmic Yellow' Sulphur Cosmos 'Ladybird Scarlet'
Sulphur Cosmos 'Lemon Twist' Sulphur Cosmos 'Sunny Red'
Sulphur Flower Sulphur Flower Buckwheat
'Sulphurea' Basket of Gold 'Sulphurea Grandiflora' Fragrant Waterlily
'Sulphureum' Epimedium Sultana (spp.)
Sultana 'Blackberry Ice' Sultana 'Blitz 2000 Red'
Sultana 'Candy® Coral Bee' Sultana 'Candy® Deep Salmon'
Sultana 'Candy® Mix' Sultana 'Candy® Rose Star'
Sultana 'Rose Parade' Sultana 'Rosette'
Sultana 'Show Stopper' Sultana 'Stardust Salmon'
Sultana 'Super Elfin Orange' Sultana 'Super Elfin Swirl'
Sultana 'Victorian Rose' 'Sultan's Ruby' Siberian Iris
'Sum & Substance' Hosta 'Sumatrana' Banana
'Summer Blues' Dwarf Delphinium 'Summer Carnival' Hollyhock
Summer Chrysanthemum 'Summer Dream Lavender' Bedding Verbena
Summer Forget-Me-Not (spp.) 'Summer Fragrance' Hosta
Summer Gentian Summer Hyacinth
Summer Hyacinth: princeps 'Summer Joy' Hosta
'Summer Light' Black-eyed Susan 'Summer Memories' Hollyhock
'Summer Music' Hosta 'Summer Pastels' Common Yarrow
Summer Phlox (spp.) Summer Phlox 'Africa'
Summer Phlox 'Australia' Summer Phlox 'Blue Paradise'
Summer Phlox 'Bright Eyes' Summer Phlox 'Creme de Menthe'
Summer Phlox 'David' Summer Phlox 'Delta Snow'
Summer Phlox 'Dodo Hanbury Forbes' Summer Phlox 'Eva Cullum'
Summer Phlox 'Fairest One' Summer Phlox 'Flamingo'
Summer Phlox 'Franz Schubert' Summer Phlox 'John Farick'
Summer Phlox 'Juliet' Summer Phlox 'Katherine'
Summer Phlox 'Laura' Summer Phlox 'Little Princess'
Summer Phlox 'Lizzy' Summer Phlox 'Mini Star'
Summer Phlox 'Miss Elie' Summer Phlox 'Miss Kelly'
Summer Phlox 'Mt. Fuji' Summer Phlox 'Nicky'
Summer Phlox 'Nora Leigh' Summer Phlox 'Prime Minister'
Summer Phlox 'Red Riding Hood' Summer Phlox 'Sandra'
Summer Phlox 'Starfire' Summer Phlox 'Tenor'
Summer Phlox 'Windsor' Summer Poinsettia: tricolor 'Molten Fire'
Summer Purslane (spp.) Summer Purslane 'Duet Yellow'
Summer Purslane 'Wildfire' 'Summer Shandy™' Ornamental Hops
'Summer Skies' Dwarf Snapdragon 'Summer Skies' Meadow Cranesbill
Summer Snapdragon 'AngelMist™ Purple Stripe' Summer Snapdragon 'Carita Deep Pink'
Summer Snapdragon 'Carita Purple' Summer Snapdragon 'Carita White'
Summer Snapdragon 'Serena Purple' Summer Snapdragon 'Serena White'
'Summer Snow' Obedient Plant 'Summer Snowball' Shasta Daisy
Summer Snowflake (spp.) 'Summer Solstice' Narrow Leaf Evening Primrose
'Summer Sorbet' Mullein 'Summer Spectacular' Orchid: Laeliocattleya
'Summer Sun' Garden Petunia 'Summer Sun' Ox Eye
Summer Tulip 'Summerlovers Biden 1850' Threadleaf Tickseed
'Summer's Kiss' Blanket Flower: grandiflorahybrid 'Summerwine' Common Yarrow
'Summit Snow' Cardinal Flower