| Picture | Plant Name | Botanical Name | Plant Description |
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| Alder-Leaf Mountain Mahogany | Cercocarpus montanus | A semi-evergreen shrub native to Western North America. Small yellow flowers turn to more conspicuous tufted seeds. The leaves are broader than other mountain mahogany species with crowded parallel veins. Very drought tolerant and will drop its leaves in extreme drought situations and then fully recover. Works great as a massed planting. |
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| Allgold Broom | Cytisus x praecox 'Allgold' | Hybrid mounding deciduous shrub. This variety of broom is slightly taller than the species. Dark green stems appear broom-like, hence the name. Bright yellow flowers adorn this shrub throughout the spring. Adapts readily to hot and dry conditions but with shorter growth. |
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| American Smoketree | Cotinus obovatus | Small deciduous tree native to North America. It is often treated more like a large shrub. Leaves emerge as pinkish-bronze turning blue-green in the summer and ending with spectacular shades of yellow, red, orange and purple in the fall. Airy panicles of flowers appear in spring and give rise to the smoke in the common name. Tolerant of drought, compacted soils and alkaline soils. |
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| Arizona Cypress | Cupressus arizonica var. arizonica | Nice, medium growth rate evergreen with silvery blue-green scales and awls. Can grow up to 50 ft high. Its pyramidal growth makes it a popular Christmas tree choice in many areas. Has beautiful red-colored, uniquely textured bark that is striking in the winter. |
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| Bailey Red Twig Dogwood | Cornus sericea 'Baileyi' | Vigorous, suckering, deciduous shrub with deep-red winter shoots. Has dark green leaves turning to red or orange in autumn. Small white flowers appear in clusters up to 2" across in late spring, followed by white fruit. Grows best in full sun and well-drained, moderately moist soil. Berrys are mildly toxic and may cause stomach aches. |
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| Blue Atlas Cedar | Cedrus atlantica 'Glauca' | Large evergreen tree with short bluish green needles. Has an irregular, open pyramidal form and is best used as a specimen tree. Trunk stays fairly straight and looks best when branches are left on to the ground. A beautiful tree that tolerates some drought but performs best with adequate water. |
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| Blue Clips Carpathian Bellflower | Campanula carpatica 'Blaue Clips' | Low-growing herbaceous perennial. Violet-blue bell shaped flowers grow profusely in mid to late-spring. Forms a mass of small dark-green leaves that stay compact and mounded. Prefers moderate amounts of water and organic soils. Use mulch to keep the soil cool. Needs adequate watering during the heat of the summer. |
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| Budd's Yellow Dogwood | Cornus sericea 'Budd's Yellow' | Multi-stemmed, rapidly-growing deciduous shrub. Spreads by suckering but not invasively. Bright yellow stems provide great winter interest. Bright green ovate leaves turn attractive shades of yellow, red and purple in the fall. Tiny yellow flowers are not very showy but turn to small white fruit that are preferred by birds. Younger branches have the best coloring. Remove 20-30% of the oldest branches each spring to stimulate growth and brighter coloring. Grows best with regular watering. |
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| California Incense Cedar | Calocedrus decurrens | Tall, narrow growing evergreen tree. Shiny, flat, dark-green needles are aromatic. Ideal for hedges and windbreaks. Small cones are produced on branch tips and produce seeds that are edible to birds. Highly drought tolerant once established. Bark on mature specimens is red and flaky. Avoid overwatering. |
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| Camperdown Elm | Ulmus glabra 'Camperdownii' | Weeping cultivar of the Scotch Elm discovered at Camperdown house in Dundee, Scotland. Umbrella-like shape gives it a distinct look in the landscape. Dark green leaves are rough and oblong. Inconspicuous greenish-red flowers appear in spring and may develop into winged seeds. Susceptible to dutch elm disease. Adaptable to a wide range of conditions. |
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| Canada Red Chokecherry | Prunus virginiana 'Schubert' | Medium to small deciduous tree available in single or multi-stemmed forms. Leaves emerge green and mature to dark purple by early summer. Clusters of pure white flowers bloom in spring eventually becoming small, bright-red, astringent fruits that make excellent jellies and jams. Prefers to grow as a multi-stemmed tree and quickly grows suckers at the tree base. Tolerates a wide range of soils. |
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| Canada Wild Rye | Elymus canadensis | Cool-season ornamental bunch grass native to North America. Long, slender, bluish-green leaves grow from 3-5 feet long. Wheat or rye-like seadheads grow on tall spikes in mid to late-summer and if left uncut provide interest during the winter months. Easily grown and tolerates a wide range of conditions. May reseed easily. |
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| Canadale Gold Wintercreeper | Euonymus fortunei 'Canadale Gold' | Mounding, broad-leaf evergreen shrub. Rounded leaves have dark-green centers with bright yellow to golden edges. Makes an excellent hedge or border plant. Annual pruning is required to maintain a good shape. |
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| Canby's Mountain Lover | Paxistima canbyi | Low-growing and spreading evergreen shrub native to the eastern United States. Grown primarily for its lustrous dark-green foliage. Inconspicuous green to red flowers bloom in the spring. Tolerates alkaline soils and drought. Grows slowly. |
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| Candied Apple Weeping Crabapple | Malus 'Candied Apple' | Weeping deciduous tree. Profuse bright-pink flowers bloom in spring followed by bright red fruit that persists on the tree until December. Leaves emerge with reddish tints and turn green in the summer. This variety is resistant to many diseases. |
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| Candytuft | Iberis sempervirens | Low-growing, evergreen perennial. Spreading branches may become woody overtime. Produces small pure white, four petalled flowers in dense, flattened clusters (corymbs) in April-May. Has dark green, leathery leaves 1-1.5" long. Prefers full sun and average, well drained soil. |
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| Cardinal Dogwood | Cornus sericea 'Cardinal' | Multi-stemmed, spreading deciduous shrub with showy bright red stems that are very attractive during the winter. Birght-green ovate leaves turn pretty shades of red and purple. White to cream flowers bloom in spring turning to white berries that are preferred by birds. Prune out 20-30% of the oldest growth each spring to promote healthy new growth with brighter coloring. |
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| Cardinal Penstemon | Penstemon cardinalis | Herbaceous perennial with upright stems native to Texas and New Mexico. Lance-shaped blue-green leaves are well-adapted to its native habitat. Dark red flowers grow on upright stems throughout the summer. Grows naturally in rocky and hot sites. Requires well-drained soil. Seldom used but is available for residential use. |
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| Cardoon | Cynara cardunculus | Thistle-like perennial, without the thorns. Forms large clumps of dark green foliage. Leaves are 20" in length. Beautiful large purple thistle-like Flowers appear in summer. The long lasting blooms attract insects. Useful ornamentally as well as for food. Leaf stalks are edible and are harvested by some. |
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| Carriere Hawthorn | Crataegus x lavalleei 'Carrierei' | Small deciduous tree with oval shape and sometime multiple stemmed. Dark green leaves are serrated on the edges and turn a bronze-red in the fall. Profuse blossoms appear in May and lead to edible fruit that is usually best left to the wildlife. Long thorns, up to 2", adorn the branches. Tolerant of a wide range of soils and drought. Susceptible to some blights. |
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