Sundowner Flax
Sunflower
Sunray Coreopsis
Sunrose
Sunset Manzanita
Superba Fescue
Swan Hill Fruitless Olive
Sweet Alyssum
Sweet Bay
Sweet Flag
Sweet Gum
Sweet Hakea
Sweet Musette Bearded Iris
Sweet Olive, Tea Olive
Sweet Orange cultivars
Sweet Pea
Sweet Violet, English Violet
Sweet-Pea Shrub
Swiss Mountain Pine