| Add to Export List | Image | Common Name | Scientific Name | Cultivar/Variety | Plant Type |
|---|---|---|---|---|---|
| Add To List Remove From List | Silver Spike Grass | Spodiopogon sibiricus | Hardy perennial, Ornamental grass | ||
| Add To List Remove From List | Silver Whispers Pine | Pinus cembra | 'Klein' | Evergreen tree | |
| Add To List Remove From List | Silver Willow | Salix alba sericea | Deciduous tree | ||
| Add To List Remove From List | Silverberry | Elaeagnus commutata | Deciduous shrub | ||
| Add To List Remove From List | Silverdust dusty miller | Senecio bicolor subsp. cineraria | 'Silver dust' | Annual | |
| Add To List Remove From List | Simon Fraser Rose | Rosa | 'Simon Fraser' | Deciduous shrub | |
| Add To List Remove From List | Sioux Blue Indian Grass | Sorghastrum nutans | 'Sioux Blue' | Hardy perennial, Ornamental grass | |
| Add To List Remove From List | Siouxland Poplar | Populus deltoides | 'Siouxland' | Deciduous tree | |
| Add To List Remove From List | Sir Trevor Lawrence Clematis | Clematis texensis | 'Sir Trevor Lawrence' | Vine | |
| Add To List Remove From List | Siskiyou Evening Primrose | Oenothera berlandieri | 'Siskiyou' | Hardy perennial | |
| Add To List Remove From List | Six Hills Giant Catmint | Nepeta | 'Six Hills Giant' | Hardy perennial | |
| Add To List Remove From List | Sixteen Candles Summersweet | Clethra alnifolia | 'Sixteen Candles' | Deciduous shrub | |
| Add To List Remove From List | Skunkbush Sumac | Rhus trilobata | Deciduous shrub | ||
| Add To List Remove From List | Sky Wings Siberian Iris | Iris sibirica | 'Sky Wings' | Hardy perennial | |
| Add To List Remove From List | Skyblue Aster | Symphyotrichum oolentangiense | Wildflower, Hardy perennial | ||
| Add To List Remove From List | Skyline® Honey locust | Gleditsia triacanthos var. inermis | 'Skycole' | Deciduous tree | |
| Add To List Remove From List | Skyracer Moor Grass | Molinia caerulea spp. arundinacea | 'Sky Racer' | Hardy perennial, Ornamental grass | |
| Add To List Remove From List | Skyrocket Eastern red cedar | Juniperus virginiana | 'Skyrocket' | Evergreen shrub | |
| Add To List Remove From List | Slenderina Weeping Blue Spruce | Picea pungens | Evergreen tree | ||
| Add To List Remove From List | Slim Jim Scotch Pine | Pinus sylvestris | 'Slim Jim' | Evergreen tree | |
| Add To List Remove From List | Slowmound Mugho Pine | Pinus mugo | 'Slowmound' | Evergreen shrub | |
| Add To List Remove From List | Smooth aster | Symphyotrichum laeve | Hardy perennial, Wildflower | ||
| Add To List Remove From List | Smooth Beard-tongue | Penstemon digitalis | Hardy perennial, Wildflower | ||
| Add To List Remove From List | Smooth Sumac | Rhus glabra | Deciduous tree | ||
| Add To List Remove From List | Smooth wild rose | Rosa blanda | Deciduous shrub | ||
| Add To List Remove From List | Snakeroot | Actaea racemosa | Hardy perennial | ||
| Add To List Remove From List | Snapdragon - dwarf | Antirrhinum majus | Annual | ||
| Add To List Remove From List | Snapdragon - intermediate | Antirrhinum majus | Annual | ||
| Add To List Remove From List | Snapdragon - tall | Antirrhinum majus | Annual | ||
| Add To List Remove From List | Sneezeweed | Helenium autumnale | Hardy perennial | ||
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