Sambucus nigra Sambuco is one of the most flavourful and tasty of the European black elderberries.

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

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

Sanguisorba 'All Time High' is a 6-8 foot tall burnet with fluffy, white, pipe cleaner-like blooms.

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.

Sarcococca humilis Winter Gem has red buds and sepals which give the fragrant blooms a bicolour effect.

Sarracenia flava var. cuprea is one of the most dramatic pitcher plants with tall, lime pitchers marked with red and copper.

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

Sarracenia oreophila hybrid is a 2 foot tall pitcher plant with dramatic yellow to lime green pitchers and golden yellow flowers.

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

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.

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.

Scutellaria 'Pat Hayward' Sky's Edge is long-lived sage relative with long-blooming, violet-blue flowers from summer to fall.

Sedum pachyphyllum 'Rose' forms cute, short-trunked colonies with cylindrical, powder blue leaves like elongated jelly beans.

Sedum rupestre 'Rice Creek' Winter Fire is a stonecrop with yellow flowers and green foliage that turns red in the colder months.

Sedum Sunsparkler 'Angelina's Teacup' is a compact, dwarf form of 'Angelina' that does not bloom.

Whatever the real identity of Sedum T001, it has cute, cupped, rounded leaves that are green on top and dusty rose beneath.

Sedum spurium 'Ruby' is a vigorous, mat-forming stonecrop with small, thick, ruby red leaves and pink flowers.

Sedum spurium Spot On 'Deep Rose' offers a spreading mat of olive green foliage topped with rich magenta flowers.

Sedum spurium 'What a Doozie' is a vigorous, mat-forming stonecrop with variegated leaves edged with yellow and creamy white.

Sedum ‘Peach Pearls’ sports apricot and pink flowers over luscious burgundy-tinted, peachy foliage.