Saucer magnolia Magnolia ×soulangeana
Sawara Cypress Chamaecyparis pisifera
Scarlet clematis Clematis texensis
Scarlet Runner Bean Phaseolus coccineus
Scarlet Sage Salvia splendens
Schizandra Schisandra chinensis
Sea campion Silene uniflora
Sea Holly Eryngium planum
Sea Thrift Armeria maritima
(5)
Sea-buckthorn Elaeagnus rhamnoides
Senecio Jacobaea maritima
Serbian spruce Picea omorika
Shasta Daisy Chrysanthemum maximum
Sheep laurel Kalmia angustifolia
Shore juniper Juniperus rigida var. conferta
Showy baby's breath Gypsophila elegans
Siberian iris Iris sibirica
(36)
Siberian peashrub Caragana arborescens
Siberian squill Scilla siberica
Siebold's plantain lily Hosta sieboldiana
(1)
Silver birch Betula pendula
Silver Cock's-Comb Celosia argentea
(4)
Silver Fir Abies alba
Silver Lace Vine Fallopia aubertii
Singleseed juniper Juniperus squamata
Siskiyou lewisia Lewisia cotyledon
Skimmia Skimmia japonica
Smoke bush Cotinus coggygria
Smooth hydrangea Hydrangea arborescens
(25)
Snake's head fritillary Fritillaria meleagris
Snapdragon Antirrhinum majus
Snow on the mountain Euphorbia marginata
Snow-in-summer Cerastium tomentosum
Soft rush Juncus effusus
Solomon's-seal Polygonatum multiflorum
Southernwood Artemisia abrotanum
Spanish Fir Abies pinsapo
Spanish flag Ipomoea lobata
Spanish Flag Lantana camara
Spider Flower Cleome spinosa
Spiked speedwell Veronica spicata
(5)
Spindle tree Euonymus fortunei
(5)
Spotted dead-nettle Lamium maculatum
Spotted laurel Aucuba japonica
Spreading Bellflower Campanula patula
Spruced-leaved stonecrop Sedum rupestre
Staghorn Sumac Rhus typhina
Star magnolia Magnolia stellata
Star-of-Bethlehem Ornithogalum umbellatum
Stemless carline thistle Carlina acaulis
Strawberry Fragaria ×ananassa
Strawflower Helichrysum bracteatum
Summer savory Satureja hortensis
Sundaville Mandevilla sanderi
Sunflower Helianthus
Sweet Alyssum Lobularia maritima
Sweet basil Ocimum basilicum
Sweet pea Lathyrus odoratus
Sweet pepper Capsicum annuum
Sweet Potato Ipomoea batatas
Sweet Sultan Centaurea imperialis
Sweet tea vine Gynostemma pentaphyllum
Sweet Vernal Adonis vernalis
Sweet violet Viola odorata
(1)
Sweet William Dianthus barbatus
(1)
Swiss Mountain Pine Pinus mugo
Swiss Pine Pinus cembra