| Picture | Plant Name | Botanical Name | Plant Description |
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| Agave Leaved Sea Holly | Eryngium agavifolium | Clump-forming, evergreen perennial. Bright green, lance-shaped leaves have toothed margins and resemble an agave. White, thistle-like flower heads form in summer. May not be entirely winter hardy and will struggle through Utah winters. |
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| Blue Dwarf Sea Holly | Eryngium planum 'Blauer Zwerg' | Clump-forming, evergreen perennial. Leathery, blue-green, spiny leaves grow from basal rosettes and also on upright-growing stems. Bears clusters of intense blue flowers. Plant in well-drained soils. Prefers moderately fertile to poor soils. Protect from excessive winter moisture. |
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| Blue Haze Euphorbia | Euphorbia 'Blue Haze' | Compact mounding perennial with outstanding narrow blue-green leaves. Summer brings bright yellowish-green flowers. Foliage provides year-round interest. Does not require large amounts of water. Hardy plant needs very little attention. |
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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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| Chameleon Euphorbia | Euphorbia dulcis 'Chameleon' | Densley mounding perennial. Yellow bracts appear around the inconspicuous green flowers in late-spring. Leaves are burgundy colored in spring and summer turning deep purple in the autumn. Grows best in well-drained soil with medium to dry watering. |
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| Claret Cup Cactus | Echinocereus triglochidiatus | Spiny, mound-forming cactus with bright scarlet-red, funnel-shaped flowers that bloom in spring. Native throughout the southwestern United States. Requires very little irrigation once established. |
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| Creeping Wallflower | Erysimum kotschyanum | Low-growing, mat-forming perennial. Tight masses of small, rounded, bright-green leaves grow well in small crevices and around rocks. Prefers well drained soils. Do not overwater. |
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| Cushion Spurge | Euphorbia polychroma | Clump-forming, herbaceous perennial. Produces abundant bright-yellow flowers from spring to summer. Stems are softly-hairy. Dark-green leaves turn red-purple to orange. Prefers light, well-drained soils. Great for border plantings. |
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| Dwarf Burning Bush | Euonymus alatus 'Compactus' | Dense, bushy, decidouous shrub with dark green leaves to 3 inches long turning a billiant red in autumn. Has a fairly slow growth rate and bears a insignificant white flower in May, followed by a small orange-red fruit, ripening in September. Prefers full sun, but will tolerate some shade and moist well drained soils. |
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| Early Hybrids Red Hot Poker | Kniphofia uvaria Early Hybrids | Upright growing perennial. Narrow grass-like leaves grow basally. Flowers are in shades of red and orange turning to yellow at the base. Very drought and heat tolerant. Deadheading will prolong bloom time. Plant in well-drained soils. |
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| Eastern Redbud | Cercis canadensis | Small to medium spreading tree. Often mulit-stemmed or low-branching. Beautiful heart-shaped leaves are bronze to purple when new turning bluish green then yellow in fall. Spring brings magenta buds followed by abundant clusters of rosy-pink flowers. One of the most popular small flowering landscape trees. Adaptable to many soil types. Moderately drought tolerant. |
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| Efanthia Euphorbia | Euphorbia 'Efanthia' | Compact evergreen perennial. Burgundy foliage emerges in spring turning green with higher temperatures. Autumn weather brings a return of the burgundy foliage color. Flowers are green and appear in spring. Tolerant of a wide range of conditions including drought. |
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| Elfin Pink Penstemon | Penstemon barbatus 'Elfin Pink' | Small clump forming perennial cultivar adapted to head and drought conditions. Basal rosettes of lance-shaped leaves are semi-evergreen. Bears pink blossoms on tall spikes. Regular dead-heading will promote longer blooming. Prefers well-drained soil and will bloom longer with regular watering. |
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| Elfin Thyme | Thymus serpyllum 'Elfin' | Very low-growing ground cover that forms a dense mat of foliage. Although seldom seen, lavender-pink flowers sometimes appear in mid to late-spring. Grows best in well drained soil in full sun. Suitable for planting in paving crevices, walkways and rock gardens. Will tolerates some traffic. |
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| Elijah Blue Fescue | Festuca glauca 'Elijah Blue' | The bluest of the blue fescues, this is a densely tufted, evergreen, perennial ornamental grass with upright silvery blue-green leaves 4-8" long. Bears wheat-golden seedhead 6-10" long in May-June. Extremely drought and heat tolerant. |
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| Emerald 'n' Gold Euonymus | Euonymus fortunei 'Emerald 'n' Gold' | Low-growing broadleaf evergreen shrub. Bears bright green leaves with bright yellow margins turning pinkish in winter. Inconspicuous greenish-white flowers appear in June. Spreads alond the ground. Will climb walls if given support. Tolerates a wide range of soils and conditions except for overwatering. |
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| Emerald Blue Phlox | Phlox subulata 'Emerald Blue' | Frost hardy, dense evergreen perennial. Low-growing branches form mats of bright green linear foliage. Late-spring to early-summer brings profuse light blue five-petaled flowers with notched petals. Suitable for rock gardens. Tolerant of drought. Plant in well-drained soils. |
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| Emerald Cascade Honeylocust | Gleditsia triacanthos 'Emerald Cascade' | Weeping form of the deciduous tree species. Although the species has thorns and large pods, this variety has no thorns and does not usually produce pods. The leaves are fernlike and composed of numerous leaflets making fall clean-up easy. The dark-green rounded leaflets have serrated edges and will turn butter-yellow in autumn. Flowers are yellow and insignificant. Very tolerant of dry and compacted soils as well as periods of drought and excess moisture. Provides light shade. |
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| Emerald Gaiety Euonymus | Euonymus fortunei 'Emerald Gaiety' | Compact broad-leafed evergreen. Bears bright green leaves with creamy white margins tinged pink in the winter. Inconspicous flowers are greenish-white and sparse. Can be trained to climb with some effort. Adaptable to many soil types and situations. Will not tolerate overwatering. |
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