Salvia madrensis 'Red Neck Girl' has maroon stems that are adorned later in the season with a compliment of yellow flowers.

Sarracenia leucophylla hybrid has tall, narrow green pitchers marked with white to light green mottling amongst red veins.

Sasa kurilensis 'Shimofuri' has long, variegated foliage up to 10x2" long and wide with thin white parallel stripes.

Sauromatum giganteum is a weird aroid with large, arrow-shaped leaves and burgundy spathes with burgundy-black spadices.

Sauromatum venosum is a weird, otherworldly looking aroid with a 2 foot tall inflorescence speckled deep purple and yellow.

Schefflera delavayi is a lush and tropical but totally hardy shrub or small tree at the cutting edge of woody horticulture.

Schizophragma hydrangeoides 'Moonlight' has 9" (23cm) clusters of flowers are ringed by flat lacy white bracts.

Schizophragma hydrangeoides 'Rosea' has 9"(23cm) clusters of flowers are ringed by flat lacy pink bracts.

Sedeveria 'Pink Ruby' is a colony-forming succulent with small, green, pointed, red-tipped leaves that flush with orange-red.

xSemponium are crosses of Aeonium and Sempervivum. 'Diamond' has lush green rosettes with red margins.

xSemponium are crosses of Aeonium and Sempervivum. 'Sienna' has stunning electric red rosettes.

Senecio mandraliscae is a spreading succulent with long blue gray pencil-like fleshy leaves and small white flowers.

Senecio peregrinus or String-of-Dolphins is grown for its foliage that resembles a pod of jumping dolphins. White flowers in spring,

Senecio rowleyanus or string-of-pearls is a trailing succulent with spherical, succulent leaves resembling a pearl necklace.

Senecio rowleyanus 'Variegata' is the variegated string of pearls or "VSOP". It is a very rare variegated form with leaves variably marked with white and ivory.

Senecio scaposus (syn. Caputia scaposa) is a cool succulent with silver to woolly white cylindrical leaves held in a tight clump.

Senecio serpens is a spreading succulent with long, blue gray, pencil-like, fleshy leaves and small white flowers.

Lush and tropical purple foliage hardy to zone 7!

Sinningia is a genus related to Gloxinia and African violets. 'Invasion Force' has pink, fragrant, tubular flowers atop felted foliage.

Smallanthus sonchifolius, known as an earth apple, has sweet, edible storage roots and single yellow flowers.

Soleirolia soleirolii known as baby’s tears has bright green evergreen leaves in lush moss-like mats.

Soleirolia soleirolii ‘Aurea’ known as golden baby’s tears has golden evergreen leaves in lush moss-like mats.

Sprekelia formosissima is an Aztec lily with bold scarlet flowers of gracefully arching petals and strap- like green foliage.