 | Calycanthus floridus | Sweetshrub; Carolina Allspice | | | Shrub > 8 feet, Deciduous, Full sun, Part shade, Zone 4a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Camellia japonica | Camellia; Rose-of-Winter | | None Listed | Shrub > 8 feet, Evergreen, Full sun, Part shade, Shade, Zone 6a, Requires acid (pH 5.0 to 7.0) |
 | Campsis radicans | Common Trumpet Creeper | | Wet Site Plants | Vine, Deciduous, Full sun, Zone 4b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0), Tolerates salt spray, Tolerates salty soil |
 | Caragana arborescens | Siberian Pea Tree | | | Tree < 30 feet, Shrub > 8 feet, Deciduous, Full sun, Zone 3a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0), Tolerates salt spray, Tolerates salty soil |
 | Carpinus betulus | European Hornbeam | | High pH | Tree > 30 feet, Deciduous, Full sun, Zone 5a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Carpinus caroliniana | American Hornbeam; Blue Beech; Ironwood; Musclewood | | High pH | Tree < 30 feet, Deciduous, Part shade, Zone 3b, Can tolerate acid to neutral soil (pH 5.0 to 7.4) |
 | Carya glabra | Pignut Hickory | | Dry Site Plants | Tree > 30 feet, Deciduous, Full sun, Zone 4a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Carya ovata | Shagbark Hickory | | Dry Site Plants | Tree > 30 feet, Deciduous, Full sun, Zone 4b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Caryopteris x clandonensis | Bluebeard, Blue-Mist Shrub | | Flowering Landscape Shrubs | Shrub < 4 feet, Groundcover, Deciduous, Full sun, Zone 5b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Castanea mollissima | Chinese Chestnut | | | Tree > 30 feet, Deciduous, Full sun, Zone 4a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Catalpa speciosa | Catalpa; Indian Bean | | High pH | Tree > 30 feet, Deciduous, Full sun, Part shade, Zone 4a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Ceanothus americanus | New Jersey Tea | | None Listed | Shrub < 4 feet, Deciduous, Full sun, Part shade, Zone 4a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Cedrus atlantica 'Glauca' | Blue Atlas Cedar | | Zone 6 & 7 Plants plus shrubs | Tree > 30 feet, Evergreen, Full sun, Zone 6b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Cedrus libani | Cedar of Lebanon | | Spruces and Firs et al. | Tree > 30 feet, Evergreen, Full sun, Zone 5b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Celastrus orbiculatus | Chinese Bittersweet | | Native and Invasive Plants | Vine, Deciduous, Full sun, Part shade, Zone 5a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Celastrus scandens | American Bittersweet | | None Listed | Vine, Deciduous, Full sun, Zone 3b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Celtis occidentalis | Hackberry; Sugarberry | | High pH | Tree > 30 feet, Deciduous, Full sun, Zone 3b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0), Tolerates salty soil |
 | Cephalanthus occidentalis | Buttonbush | | Wet Site Plants | Shrub 4 to 8 feet, Deciduous, Full sun, Part shade, Zone 3b, Can tolerate acid to neutral soil (pH 5.0 to 7.4), Tolerates salt spray, Tolerates salty soil |
 | Cercidiphyllum japonicum | Katsuratree; Katsura Tree | | Big Trees in Winter, High pH | Tree > 30 feet, Deciduous, Full sun, Zone 5a, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
 | Cercis canadensis | Eastern Redbud | | Dry Site Plants;
Spring Flowering Trees and Shrubs, Dry Site Plants | Tree < 30 feet, Shrub > 8 feet, Deciduous, Full sun, Part shade, Zone 5b, Can tolerate acid to alkaline soil (pH 5.0 to 8.0) |
