Scadoxus multiflorus or blood flower produces fantastic red spheres 6-12 inches across in late summer! Like a fiery ornamental onion.

Scadoxus multiflorus subsp. katharinae (syn. Haemanthus) is an extra large form with magnificent 10 inch orange globes.

Scadoxus pole-evansii (syn. Haemanthus) is a stunning species that can reach four feet high with umbels of salmon orange.

Scadoxus puniceus (syn. Haemanthus) has beautiful clusters of golden anthers held on red filaments with burgundy bracts.

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

Schisandra chinensis 'Eastern Prince' is a self-fertile five-flavour berry that can produce up to 20 pounds of fruit per vine.

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.

Sciadopitys verticillata, the Japanese umbrella pine, is an ancient conifer with long, thick needles held like the spokes of an umbrella.

Scrophularia macrantha has curious, bird-like, bright red, tubular flowers that bloom from early summer to frost.

Scrophularia macrantha Cardinale Red has curious, bird-like, bright red, tubular flowers that bloom from early summer to frost.

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

Sedum palmeri has great evergreen rosettes of broad, rounded, blue-green foliage and very pretty clusters of yellow flowers in mid- to late summer.

Sedum Rock 'N Grow 'Boogie Woogie' is an exciting, variegated sport with a tidy, compact habit.

Selenicereus costaricensis is the Costa Rican or red pitaya or dragon fruit with deep pink skin and magenta flesh.

Selenicereus megalanthus is the vining cactus that produces yellow dragon fruit from its night blooming flowers.

Selenicereus undatus is the pitaya blanca or white dragon fruit with pink skin and white flesh from huge night-blooming flowers.

Sempervivum 'Gold Nugget' from the Chick Charms series is a stupendous gold and red cultivar.

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 candicans 'Angel Wings' is a "wow" plant with large, silver-white, ruffled, velvety leaves with toothed edges.