Sorghastrum nutans 'Golden Sunset' is a tall and vertical clumping yellow prairie grass with golden flower spikes.

Spirea betulifolia 'Glow Girl' is a cold-hardy, multi-stemmed shrub with white flowers and golden-green foliage.

Spirea japonica 'Double Play Gold' is a cold-hardy, multi-stemmed shrub with pink flowers and golden-green foliage.

Stapelia gigantea is a crazy succulent with amazing flowers that look like huge fuzzy starfish up to 12 inches across!

Stephania erecta (syn. S. pierrei) is a cool novelty houseplant that grows as a small vine from a rounded caudex.

Strelitzia reginae, the bird-of-paradise, is one of the most famous and distinctive of the tropical flowers resembling an orange and blue crane.

'Mandela's Gold' (formerly 'Kirstenbosch Gold') is a special form of Strelitzia reginae with yellow flowers.

Streptocarpus 'Harlequin Blue' is a Cape primrose and relative of the African violet with bi-coloured flowers of lavender-blue and yellow.

Streptocarpus 'Harlequin Purple' is a Cape primrose and relative of the African violet with bi-coloured flowers of violet and pale yellow.

Streptocarpus Ladyslippers 'Yellow Pink Cap' is a relative of the African violet with bi-colour blooms of pink and yellow.

Styrax obassia, the fragrant snowbell, is a lesser-known relative of the Japanese snowbell, Styrax japonicus.

Succisa pratensis, known as blue buttons or devil's-bit scabious, is a perennial wildflower with globular, purple pincushions.

Syringa meyeri Flowerfesta White is a reblooming, dwarf lilac producing larger-than-average white, very fragrant, dense panicles.

Syringa meyeri 'Pearl Potion' is a cold-hardy, compact lilac with pink buds and pure white fragrant flowers.

Syringa vulgaris 'Congo' has warm purple buds opening to lavender flowers.

Syringa vulgaris 'Edward J. Gardner' has unusual pink flowers.

Syringa vulgaris 'Mme Lemoine' is the classic white lilac with icy white blooms.

Syringa vulgaris New Age Lavender grows to just 5 feet with pink buds opening to fragrant lavender flowers.

Syringa vulgaris New Age White grows to just 5 feet high with cream buds opening to white fragrant flowers.

Syringa vulgaris 'Sensation' has warm purple flowers with white edges.

Syringa Bloomerang 'Dwarf Pink' is a dwarf, reblooming lilac with large, densely packed panicles of fragrant, rich pink tubular flowers.

Syringa Bloomerang 'Dwarf Purple' is a dwarf, reblooming lilac with large, densely packed panicles of fragrant, purple, tubular flowers.

Syringa 'Josee' is a reblooming, dwarf lilac producing sweetly-scented pink flowers

You'll never forget the first time you see a black bat flower in full bloom! Tacca chantrieri 'Black' is super botanically intriguing.

You'll never forget the first time you see a white bat flower in full bloom! Tacca chantrieri 'Nivea' is super botanically intriguing.