Candelabras of yellow daisies atop mounds of dramatic foliage.

Silphium perfoliatum or cup plant is a dramatic perennial with towering 6-8 feet tall stems with bright yellow daisies.

Silphium perfoliatum 'The Holy Grail' is a dramatic cup plant due to its height, chartreuse foliage and bright yellow daisies.

Sisyrinchium californicum is known as the golden-eyed grass. It has iris-like foliage and cheerful six-tepaled, star-shaped flowers.

Sisyrinchium idahoense, the Idaho blue-eyed grass, has small iris-like foliage and cheerful star-shaped blue flowers.

Sisyrinchium nashii 'Suwannee' is a blue-eyed grass with small iris-like foliage and cheerful starry sky blue flowers.

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

Solanum tuberosum 'Banana' is a versatile gourmet fingerling potato with yellow flesh.

Solanum tuberosum 'Bellanita' is a versatile gourmet fingerling potato with excellent tasting yellow flesh and high yield.

Solidago caesia has arching wands of clustered gold flowers contrasted with blue-green stems.

Solidago gigantea is a steroidal species known as giant goldenrod since it can reach more than 6 feet high!

Solidago shortii 'Solar Cascade' is a nativar of the endangered Short's goldenrod with cascading branches of long-blooming yellow flowers.

Spigelia marilandica is a striking and beautiful long-blooming eastern North American native.

Spigelia marilandica 'Little Redhead' is an improvement upon the striking, long-blooming eastern North American native.

Spigelia marilandica 'Ragin Cajun' has red tubular flowers and yellow throats. A North American native commonly known as Indian Pink.

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

Spiraea douglasii or hardhack is a BC native offering very showing spires of pink pink fuzzy flowers popular with pollinators.

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

Spiraea 'Ogon' is a stunning and very hardy deciduous shrub with golden, willowy leaves and pure white flowers in spring.

Stachys monieri 'Hummelo' is the Perennial Plant of the Year for 2019 with attractive textured leaves and spikes of lavender rose pink flowers in early to mid summer.

Stachys spathulata (S. minima) is like a darling dwarf version of 'Hummelo' with attractive foliage and darling spikes of lavender pink.

Stachys 'Lilac Falls' grows as spreading mounds of lush foliage topped for months with short spikes of lilac pink flowers.

Stemmacantha centaureoides is a dramatic perennial silver-green, cardoon-like foliage and thistle-like lavender-pink flowers from shiny light brown bracts.

Streptocarpus Ladyslippers 'Red Bicolor" is a relative of the African violet with bi-color blooms of red and pink.

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