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