Sandersonia aurantiaca has pendulous, bell-shaped, bright orange flowers that look like Chinese lanterns.

'Lilac Squirrel' comes from a rare species of Sanguisorba or burnet. It has intriguing, pendulous, lilac-pink bottlebrushes.

Sanguisorba 'Strawberry Fost' is a medium sized burnet with long-blooming white and frosted-pink, pipe cleaner-like flowers.

Sanguisorba 'Blackthorn' is a 2-3 foot tall burnet with long-blooming rosy-pink, bottlebrush flowers.

Saponaria x lempergii 'Max Frei' is a hybrid soapwort popular as a front of border perennial for English cottage-style gardens.

Sarracenia 'Bug Bat' is a carnivorous pitcher plant with red flowers and hoods atop tall, chartreuse-green pitchers.

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

Saxifraga fortunei 'Rubrifolia' has clusters of white flowers with slender, long petals and two-toned foliage.

Saxifraga stolonifera 'Harvest Moon' is a strawberry begonia with golden foliage with hints of burgundy and pink-white flowers.

Saxifraga stolonifera 'Tricolor', the strawberry geranium or begonia, has variegated green, white, pink and maroon foliage.

Scabiosa Flutter 'Deep Blue' has larger, deeper blue flowers than 'Butterfly Blue'. Popular with butterflies.

Scabiosa Flutter 'Pure White' produces glistening, pure white pompoms from spring through summer.

Scabiosa Flutter 'Rose Pink' has large pink pincushions all summer long perfect for humans and butterflies.

Scabiosa columbaria 'Vivid Violet' offers large, glowing violet-pink pincushion flowers popular with butterflies.

Schizachryium 'Blue Paradise' forms bold, wiry, upright mounds of silvery blue foliage and stems that develop wine red colours in fall.

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.

Scilla mischtschenkoana blooms early with palest blue, starry, bell-shaped flowers with royal blue midribs.

Scilla siberica is an easy and extremely hardy beauty with glowing blue, starry, bell-shaped flowers with royal blue midribs and dark blue pollen!

Scutellaria ovata or heartleaf skullcap has purple infused new growth followed by tubular purple flowers.

Scutellaria resinosa 'Smoky Hills' is a dainty little sage relative with textured mounds of grey-green leaves and purple-blue early summer flowers.

Scutellaria suffrutescens or cherry skullcap is covered in bright pink to cherry red, snapdragon-like flowers from spring until fall.

xSedoro ‘Blue Elf’ is the first inter-generic hybrid between Sedum and Orostachys. It has steel-blue tufted rosettes topped with tight clusters of dark-pink flowers that attract bees.

Sedum ellacombianum 'Cutting Edge' is a mounding sedum with scalloped, spatula-shaped leaves with gold margins.