| Tilia americana | American Linden; Basswood | | High pH | Tree > 30 feet, Deciduous, Full sun, Zone 3a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Thuja plicata | Western or Giant Arborvitae | | Evergreens with Scales | Tree > 30 feet, Evergreen, Full sun, Part shade, Shade, Zone 4a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Thuja occidentalis | Eastern Arborvitae; White Cedar; American Arborvitae | | Evergreens with Scales | Tree > 30 feet, Evergreen, Full sun, Part shade, Zone , Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Taxus x media | Anglo Japanese Yew | | None Listed | Evergreen, Zone |
| Taxus cuspidata | Japanese Yew | | Pines et. al. | Tree < 30 feet, Shrub > 8 feet, Shrub 4 to 8 feet, Shrub < 4 feet, Evergreen, Full sun, Part shade, Shade, Zone 4b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Taxus baccata | English Yew; Common Yew | | | Tree > 30 feet, Evergreen, Full sun, Part shade, Shade, Zone 5b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Taxodium distichum | Bald Cypress | | Wet Site Plants | Tree > 30 feet, Deciduous, Full sun, Zone 5b, Requires acid (pH 5.0 to 7.0), Tolerates salt spray, Tolerates salty soil |
| Syringa x chinensis | Chinese Lilac | | None Listed | Shrub > 8 feet, Deciduous, Full sun, Zone , Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Syringa vulgaris | Common Lilac | | Flowering Landscape Shrubs | Shrub > 8 feet, Deciduous, Full sun, Zone 3b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Syringa villosa | Late Lilac | | | Shrub > 8 feet, Deciduous, Full sun, Zone 3a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Syringa reticulata | Japanese Tree Lilac | | Dry Site Plants | Tree < 30 feet, Deciduous, Full sun, Zone 3a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0), Tolerates salty soil |
| Syringa pubescens subsp patula 'Miss Kim' | Manchurian Lilac | | Flowering Landscape Shrubs | Shrub > 8 feet, Deciduous, Full sun, Part shade, Zone 3a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Syringa pekinensis | Pekin Lilac | | | Tree < 30 feet, Deciduous, Full sun, Zone 4b, Can tolerate acid to neutral soil (pH 5.0 to 7.4), Tolerates salty soil |
| Syringa meyeri 'Palibin' | Palibin Meyer Lilac | | Flowering Landscape Shrubs | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 4a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Symphoricarpos x chenaultii | Chenault Coralberry | | None Listed | Deciduous, Zone |
| Symphoricarpos orbiculatus | Coralberry; Indian Currant | | None Listed | Deciduous, Zone |
| Symphoricarpos albus | Common Snowberry | | None Listed | Shrub 4 to 8 feet, Shrub < 4 feet, Deciduous, Full sun, Part shade, Zone , Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
| Styrax obassia | Fragrant Snowbell | | None Listed | Tree < 30 feet, Deciduous, Full sun, Part shade, Zone 5a, Can tolerate acid to neutral soil (pH 5.0 to 7.4) |
| Styrax japonicus | Japanese Snowbell | | None Listed | Tree < 30 feet, Deciduous, Full sun, Part shade, Zone 5b, Can tolerate acid to neutral soil (pH 5.0 to 7.4) |
| Styphnolobium japonicum | Japanese Pagoda Tree; Scholar-Tree | | Dry Site Plants, Campus trees walk | Tree > 30 feet, Deciduous, Full sun, Zone 5b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0), Tolerates salty soil |