Quick facts…
- All evergreens lose some of their leaves each year.
- Broadleaved evergreens grow best in areas protected from winter sun, cold, and drying winds.
- When selecting evergreens, consider soil and site conditions.
- Consider mature size when planting evergreens as overcrowding evergreens will affect their natural shape and beauty.
- Broadleaved evergreens generally require more consistent soil moisture than most narrow-leaved evergreens.
- Good soil drainage is essential for optimum growth.
Introduction
Evergreens add year-round beauty and attractiveness to home landscapes. For practical purposes, evergreen shrubs are classified as broadleaved or narrow-leaved.
Narrow-leaved evergreens, such as pines and junipers, have needle-like foliage. Evergreen plants that do not have needle-like foliage are known as broadleaved evergreens.
All evergreens lose some of their leaves each year. Most broadleaved evergreens lose some of the older leaves during the winter or when new growth resumes in the spring. Narrow-leaved evergreens can maintain foliage for two years or more. Eventually the innermost, oldest foliage drops off. Evergreens that are sheared tend to be bare on the inside because the outer growth promoted by shearing excessively shades the foliage towards the inside, causing it to drop.
Selecting Evergreens
When selecting landscape evergreens, consider soil and site conditions before deciding what to plant. Many broadleaved evergreens fare poorly in Colorado if placed on a south or west exposure due to bright winter sun, cold, and drying winds.
Broadleaved evergreens do best if located on protected east or north exposures. Consider mature size when planting evergreens. If evergreens are planted too close together or too close to a structure, the natural shape and beauty of the plants can be affected.
For evergreen shrubs adaptable to 6000 feet or less in Colorado, see Table 1 for narrow-leaved evergreens and Table 2 for broadleaved evergreens. Generally, broadleaved evergreens require consistent soil moisture. The general soil moisture conditions for good plant performance are shown in the tables.
Drainage and Soil Conditions
Good drainage and soil aeration are essential for optimum growth. Where planting soils are mostly clay, amend them with coarse organic material such as compost, sphagnum peat, or aged barnyard manure (6-months or older). It takes about 3-5 cubic yards of organic material per 1,000 square feet to improve clay soil. Thoroughly mix the organic material into clay soil, to a depth of 8 to 10 inches.
If planting soils are too sandy, improve water-holding capacity by similarly adding organic amendments. Organic mulch is recommended over the entire area after planting.
Most evergreen shrubs growing in Colorado landscapes, whether recently transplanted or well-established, benefit from supplemental water during winter dry spells.
Table 1: Narrow-leaved evergreen shrubs.
Tables 1A – 1D detail height, growth rate, soil moisture and exposure for Arborvitae, Juniper, Spruce and Yew.
Table Key:
Growth Rate: S=slow; M=moderate; F=fast
Soil Moisture: H=high; M=medium; L=low
Exposure: S=sun; PS=partial sun; Sh=Shade
Plant Select® plants may be viewed online at www.plantselect.org
Table 1A. Arborvitae
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Thuja occidentalis Eastern Arborvitae: ‘Hetz Midget’ | 3 x 3 | S | M | S to PS | Dense, globe-shaped. |
| Thuja occidentalis Eastern Arborvitae: ‘Holmstrup’ | 5 x 3 | S | M-H | S to PS | Compact pyramid; holds foliage color in winter. |
| Thuja occidentalis Eastern Arborvitae: ‘Little Giant’ | 4 x 4 | S | M | S to PS | Globe-shaped. |
Table 1B. Juniper
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Juniperus communis: Alpine Carpet® | 1 x 5 | M | L | S | Blue-green needles with white stripes. |
| Juniperus communis: Blueberry Delight® | 1 x 5 | M | L | S | Dense spreading juniper with silvery green needles. |
| Juniperus communis: ‘Effusa’ | 1 x 6 | M | L | PS-Sh | Low mounding juniper with silvery green needles. |
| Juniperus sabina Savin Juniper: ‘Arcadia’ | 2 x 6 | M | L | S | Spreading & mounded with lacy bright green foliage. |
| Juniperus sabina Savin Juniper: ‘Broadmoor’ | 2 x 6 | M | L | S | Dense, mounding, dark green form. |
| Juniperus sabina Savin Juniper: ‘Buffalo’ | 2 x 6 | M | L | S | Bright green foliage on a flat top form. |
| Juniperus sabina Savin Juniper: Calgary Carpet® | 1 x 6 | M | L | S | Soft green needles and spreading growth habit. |
| Juniperus sabina Savin Juniper: ‘Sierra Spreader’ | 1 x 6 | M | L | S | Soft green needles and spreading growth habit. |
| Juniperus sabina Savin Juniper: ‘Tamariscifolia’ | 2 x 6 | M | L | S | Spreading and mounded with tiered branching – also known as Tammy. |
| Juniperus scopulorum Rocky Mountain Juniper: ‘Table Top Blue’ | 6 x 8 | M | L | S | Silvery-blue foliage; broad, flat-topped habit. |
| Juniperus squamata: Singleseed Juniper ‘Blue Star’ | 3 x 4 | S | L | S-PS | Silvery-blue needles arranged in a star-like pattern; compact mounded habit. |
| Juniperus x media Spreading Juniper: ‘Armstrong’ | 4 x 8 | M | L | S | Gray-green lacy foliage on arched branches. |
| Juniperus x media Spreading Juniper: ‘Holbert’ | 3 x 8 | M | L | S | Silver-blue foliage with wide spreading growth habit. |
| Juniperus x media Spreading Juniper: ‘Old Gold’ | 3 x 6 | M | L | S | Golden-yellow arching branch tips. |
| Juniperus x media Spreading Juniper: ‘Pfitzeriana Compacta’ | 4 x 9 | M | L | S | Silver-blue foliage with wide spreading growth habit. |
| Juniperus x media Spreading Juniper: ‘Sea Green’ | 6 x 8 | M | L | S | Mint green foliage, vase-shaped habit, also known as Mint Julep™. |
| Pinus densiflora Japanese Red Pine: ‘Umbraculifera’ Tanyosho Pine | 10 x 10 | S | M | S | Umbrella form with orange bark and medium green needles. |
| Pinus mugo Mugo Pine: ‘Big Tuna’ | 10 x 7 | S | L | S | Dense, upright habit; dark green needles. |
| Pinus mugo Mugo Pine: ‘Mops’ | 3 x 3 | S | L | S | Dense, compact globe; dark green needles. |
| Pinus mugo Mugo Pine: ‘Pumilio’ | 6 x 8 | S | L | S | Variable habit; multi-stemmed. |
| Pinus mugo Mugo Pine: ‘Slowmound’ | 4 x 6 | S | L | S | Dense, compact mushroom-shaped; dark green needles. |
| Pinus mugo Mugo Pine: ‘White Bud’ | 3 x 4 | S | L | S | White buds contrast with dark green needles. |
| Pinus nigra Austrian Pine: ‘Hornibrookiana’ | 3 x 6 | S | L | S | Broad shrubby form with dark green needles. |
| Pinus strobus Eastern White Pine: ‘Blue Shag’ | 4 x 4 | S-M | M | S-PS | Globe-shape form with blue-green foliage. May turn yellowish in alkaline soils. |
| Pinus sylvestris Scotch Pine: ‘Albyn Prostrata’ | 3 x 8 | S-M | L | S | Spreading form with shiny green needles. |
| Pinus sylvestris Scotch Pine: ‘Glauca Nana’ | 8 x 6 | S | L-M | S-PS | Dense, rounded habit; blue-green needles. |
| Pinus sylvestris Scotch Pine: ‘Hillside Creeper’ | 3 x 8 | M | L-M | S-PS | Spreading form with medium green needles that become lighter in winter months. |
| Pinus sylvestris Scotch Pine: ‘Pumila’ | 10 x 6 | S-M | L-M | S-PS | Broad, upright habit; bluish-green needles. |
Table 1C. Spruce
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Picea abies Norway Spruce: ‘Elegans’ | 4 x 6 | S | M | S-PS | Nest-shaped with short needles. |
| Picea abies Norway Spruce: ‘Nidiformis’ | 3 x 5 | S | M | S-PS | Nest-shaped with short green needles. |
| Picea abies Norway Spruce: ‘Pendula’ | 6 x 8 | S | M | S-PS | Weeping habit, short dark green needles. |
| Picea abies Norway Spruce: ‘Pumila’ | 4 x 5 | S | M | S-PS | Compact, nest-shaped mound with dark needles. |
| Picea glauca Dwarf Alberta Spruce: ‘Conica’ | 8 x 4 | S | M | S-PS | Dense, conical shape with short green needles; best with winter protection. |
| Picea pungens Colorado Spruce: ‘Globosa’ | 3 x 4 | S | M | S-PS | Globe-shaped with green needles. |
| Picea pungens Colorado Spruce: ‘Mesa Verde’ | 2 x 5 | S | M | S-PS | Nest-shaped with green needles. |
| Picea pungens Colorado Spruce: ‘Procumbens’ | 2 x 10 | S | M | S-PS | Silvery-blue needles on branches that hug the ground. |
| Picea pungens Colorado Spruce: ‘St Mary’s Broom’ | 3 x 4 | S | M | S-PS | Globe-shaped with blue-green needles. |
| Picea pungens Colorado Spruce: ‘Walbrunn’ | 3 x 4 | S | M | S | Nest-shaped with blue green needles. |
Table 1D. Yew
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints | |
|---|---|---|---|---|---|---|
| Taxus cuspidata Japanese Yew: Emerald Spreader® ‘Monloo’ | 3 x 8 | S | M | PS-Sh | Compact, spreading form, dark green needles and red fruit. | |
| Taxus x media Anglojap Yew: ‘Densiformis’ | 3 x 7 | S | M | PS-SH | Dense, rounded form with dark green needles and red fruit. | |
| Taxus x media Anglojap Yew: ‘Hicksii’ | 8 x 3 | M | M | PS-SH | Columnar form with dark green needles and red fruit. | |
| Taxus x media Anglojap Yew: ‘Tauntonii’ | 3 x 5 | S | M | PS-SH | Dense, wider than tall with dark green needles. | |
Table 2: Broadleaved evergreen shrubs.
Tables 2A – 2J detail height, growth rate, soil moisture and exposure for Boxwood, Broom, Cotoneaster, Daphne, Euonymus, Holly, Manzanita, Oregon Grapeholly, Pyracantha and Rhododendron.
Table Key:
Growth Rate: S=slow; M=moderate; F=fast
Soil Moisture: H=high; M=medium; L=low
Exposure: S=sun; PS=partial sun; Sh=Shade
Plant Select® plants may be viewed online at www.plantselect.org
Table 2A. Boxwood
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Buxus microphylla Littleleaf Boxwood: ‘Winter Gem’ | 4 x 4 | S-M | M | PS-Sh | Globe shaped, lustrous dark green leaves; needs protected spot. |
| Buxus microphylla Littleleaf Boxwood: ‘Wintergreen’ | 3 x 3 | S-M | M | PS–Sh | Lustrous dark green leaves; needs protected spot. |
| Buxus microphylla koreana: Korean Boxwood | 3 x 4 | S-M | M | PS-Sh | Broad, round dark green leaves turn yellowish brown in winter. |
| Buxus microphylla koreana: ‘Julia Jane’ | 4 x 4 | S-M | M | PS-Sh | Upright rounded habit; new leaves lighter green, older leaves darker green; needs protected spot. |
| Buxus sempervirens Common Boxwood: ‘Green Tower’ | 6 x 1 | S | M | PS-Sh | Upright cone shape; needs protected spot. |
| Buxus sempervirens Common Boxwood: ‘Vardar Valley’ | 3 x 4 | S-M | M | PS-Sh | Flat topped with dark blue-green leaves; needs protected spot. |
| Buxus x hybrida: ‘Green Mountain’ | 4 x 2 | S-M | M | PS-Sh | Upright cone shape; needs protected spot. |
| Buxus x hybrida: ‘Green Velvet’ | 4 x 4 | M | M | PS-Sh | Rounded, dense habit with dark green foliage; needs protected spot. |
Table 2B. Broom
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Cytisus purgans Spanish Gold™ Broom | 4 x 6 | M | M-L | S-PS | Dense mounded habit; bright yellow flowers in spring; good hardiness; Plant Select® 2000. |
| Cytisus scoparius ‘Moonlight’ Moonlight Scotch Broom | 5 x 5 | M | L | S | Upright becoming open; light yellow flowers; narrow green leaves; stems and twigs remain green. |
| Cytisus x ‘Lena’ Lena Broom | 3 x 4 | M | L | S | Upright becoming more open; yellow and red flowers; narrow green leaves; stems and twigs remain green. |
| Cytisus x praecox ‘Allgold’ Warminster Allgold Broom | 5 x 5 | M | L | S | Dense, mounding growth habit; deep yellow flowers. |
Table 2C. Cotoneaster
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Cotoneaster dammeri ‘Coral Beauty’ Coral Beauty Cotoneaster | 2 x 6 | M | M | PS | Wide spreading; glossy green leaves; semi-evergreen; white flowers; red fruit; needs protected spot. |
Table 2D. Daphne
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Daphne x burkwoodii: ‘Carol Mackie’ | 4 x 4 | S | M | PSh | Green leaves with creamy margins; fragrant pink flowers in spring. Plant Select® 1997. |
| Daphne x burkwoodii: ‘Briggs Moonlight’ | 3 x 3 | S | M | PSh | Yellow leaves with green margins; fragrant pink flowers in spring. |
Table 2E. Euonymus
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Euonymus fortune: ‘Emerald Gaiety’ | 3 x 4 | M | M | PS-S | Mounded and spreading; green leaves with white margins and pink tinge in winter; can climb. |
| Euonymus fortune: ‘Emerald ‘n Gold’ | 2 x 4 | S-M | M | PS-Sh | Mounded and spreading; green leaves with gold margins and pink tinge in winter; can climb. |
| Euonymus fortune: ‘Green Lane’ | 3 x 6 | S-M | M | PS-Sh | Mounded and spreading; glossy dark green leaves; pink fruit with orange seed in late summer; can climb. |
| Euonymus fortune: ‘Moonshadow’ | 2 x 4 | S-M | M | PS-Sh | Spreads, yellow leaves with green irregular margins; can climb. |
| Euonymus fortune: ‘Sarcoxie’ | 6 x 6 | M-F | M | PS-Sh | Upright spreading habit, glossy dark green leaves; creamy fruits with orange seeds; can climb. |
| Euonymus kiautschovicus ‘Manhattan’ Manhattan Euonymus | 4 x 6 | M-F | M | PS-Sh | Rounded, glossy dark green leaves; often winter burns in exposed sites but recovers with new growth. |
Table 2F. Holly
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Ilex x meserveae: ‘Blue Boy’ | 5 x 5 | S | M | PS-Sh | Spreading habit with glossy, dark green spiny leaves; male, does not set fruit; needs well amended soil in protected area. |
| Ilex x meserveae: ‘Blue Girl®’ | 5 x 5 | S | M | PS-Sh | Spreading habit with glossy, dark green spiny leaves; female, sets bright red fruit if planted near male plant such as ‘Blue Boy’. |
| Ilex x meserveae: Berri Magic® Kid | 5 x 5 | S | M | PS-Sh | ‘Blue Boy’ and ‘Blue Girl’ potted in the same container. |
Table 2G. Manzanita
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Arctostophylos x coloradensis | 1 x 3-5 | S | L-M | S-PS | Spreading habit, white-pink flowers followed by red fruit; needs well drained soil; Plant Select® 2005. |
| Panchito™ | 1 x 2-3 | S | L-M | S-PS | Mounded habit, white flowers followed by red fruit; needs well drained soil; Plant Select® 2006. |
| ‘Chieftain’ | 2 x 8 | S | S-PS | Spreading habit; white flowers followed by red fruit; needs well-drainied soil. Plant Select® 2013. | |
| Arctostaphylos uva-ursi | 0.5 x 5 | S | L-M | PS-Sh | Spreading habit; pink tinged red; flowers followed by red fruit; prefers neutral to acidic well drained soils. |
| Kinnikinnick, Bearberry ‘Massachusetts’ | 0.5 x 5 | S | L-M | PS–Sh | Spreading habit, pink-tinged flowers followed by red fruits; prefers neutral to acidic well drained soils. |
Table 2H. Oregon Grapeholly
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Mahonia aquifolium: Oregon Grapeholly ‘Compactum’ | 6 x 5 | S-M | L-M | PS-Sh | Upright, spreading habit with blue-green, spiny, thick leaves that turn purplish in winter; yellow flowers followed by blue-black, grape-like fruit. Subject to winter burn. |
| Mahonia aquifolium: Compact Oregon Grapeholly | 3 x 3 | S | L-M | PS-Sh | Dense, mounded habit, glossy, thick, spiny leaves turn maroon in winter; flowers and fruit as above. Subject to winter burn. |
| Mahonia repens Creeping Oregon Grapeholly | 1 x 3 | S | L-M | PS-Sh | Low, spreading ground cover; blue-green, spiny leaves turn purplish in winter; flowers and fruit as above. |
Table 2I. Pyracantha
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Pyracantha angustifolia ‘Gnozam’: Gnome®Pyracantha ‘Monon’ | 5 x 5 | M | L-M | S-PS | Globe-shaped, dense habit with thorny branches; dark green, narrow leaves; white flowers followed by orange persistent fruit. |
| Pyracantha angustifolia ‘Gnozam’: Yukon Belle® Pyracantha | 8 x 6 | M | L-M | S-PS | Upright, spreading habit with thorny branches; dark green, narrow leaves; white flowers, orange persistent fruit. |
| Pyracantha coccinea ‘Lowboy’: Lowboy Pyracantha ‘Wyattii’ | 3 x 6 | M | L-M | S-PS | Lower, spreading habit with thorny branches; rich green foliage; white flowers followed by orange persistent fruit. |
| Pyracantha coccinea ‘Lowboy’: Wyatt Pyracantha | 6 x 6 | M | L-M | S-PS | Upright, spreading habit with thorny branches; oval dark green leaves; white flowers followed by orange-red fruit. |
Table 2J. Rhododendron
| Plant Name | Height (H’xW’) | Growth Rate | Soil Moisture | Exposure | Comments and Cultural Hints |
|---|---|---|---|---|---|
| Rhododendron spp.: ‘Nova Zembla’ | 5 x 5 | S | M-H | PS-Sh | Upright, rounded habit; dark green leathery leaves and red flowers; needs amended acidic soil and a protected site. |
| Rhododendron spp.: ‘P.J.M.’ | 4 x 4 | S | M-H | PS-Sh | Rounded habit with smaller, leathery leaves that turn maroon in winter; lavender-pink flowers; needs amended acidic soil and a protected site. |
| Rhododendron spp.: ‘Ramapo’ | 3 x 3 | S | M-H | PS-Sh | Compact mounded habit; dark green leaves turn purplish in winter; violet-purple flowers; needs amended acidic soil and a protected site. |
| Rhododendron spp.: ‘Roseum Elegans’ | 5 x 6 | S | M-H | PS-Sh | Upright, spreading habit; larger oblong leaves turn reddish in winter; rose-pink flowers; needs amended acidic soil and a protected site. |
Reference: CSU Fact Sheet 7.414