Sidalcea hendersonii, Henderson's checker mallow, is an extremely rare native species with lovely spires pink flowers.

Sidalcea malviflora ssp. virgata is a native West Coast hollyhock relative with pink flowers on erect stems.

Silene acaulis, moss campion, is a small, mountain-dwelling wildflower with pink flowers on mossy carpets.

Silene 'Clifford Moor' has variegated leaves edged with yellow fading to creamy yellow topped with bright pink, pinwheel-like flowers.

Silene dioica 'Inane' has attractive burgundy-flushed foliage and bright magenta-pink, pinwheel-like flowers from early summer to fall.

Silene 'Ray's Golden' is an update on this species with bright pink, pinwheel-like flowers held above clean, golden-yellow foliage.

Silene virginica has fiery scarlet red stars that are a natural hummingbird magnet!

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.