Tree & Shrub Gallery

This gallery contains information about our available tees and shrubs offered through our Tree Program. Click on the links below to learn more about each species. 

 
 

Caragana 

Caragana arborescens

Growth Form: irregular or hedgelike
Crown Density: dense,Size: 8-12 feet high 5-8 foot spread
Drought Resistance: excellent, Cold Hardiness: excellent
Growth Rate: rapid, Life Span: moderate
Elevational Range: to 9,500 feet
Soil Conditions: good salt and alkaline tolerance
Possible Insect Problems: aphids and grasshoppers
Possible Disease Problems: very resistant
Wildlife Value: good: songbirds
Seasonal Color: yellow spring flowers, Miscellany: does well in poor soils

 

Quaking Aspen

Populus tremuloides

Growth Form: ovoid to columnar
Crown Density: open, Size: 35-50 feet high 20-35 foot spread
Drought Resistance: poor, Cold Hardiness: excellent, 
Growth Rate: rapid, Life Span: moderate
Elevational Range: to 11,000 feet
Soil Conditions: prefer Coarse, Gravelly
Possible Insect Problems: poplar borer, scale, tent caterpillar, twig gall fly
Possible Disease Problems: cytospora canker, leaf spot
Wildlife Value: high: buds and catkins for food value for grouse and browsers
Seasonal Color: yellow fall color
Miscellany: native

 

NarrowLeaf CottonWood

Populus angustifolia          

Growth Form: ovoid to irregular, Crown Density: moderate
Size: to 50 feet high, to 30 foot spread
Drought Resistance: fair, Cold Hardiness: excellent
Growth Rate: rapid, Life Span: moderate
Elevational Range: 5,000 to 9,500 feet
Soil Conditions: tolerates alkaline well
Possible Insect Problems: blotchmine beetle
Possible Disease Problems: cytospora canker; bacterial wetwood
Wildlife Value: moderate: nesting and roosting cover; buds catkins and twigs for food value
Seasonal Color: yellow
Miscellany: native; very weak wood

 

Lilac

Syringa spp.          

Growth Form: round to irregular, Crown Density: dense
Size: 8-12 feet high 8-12 foot spread
Drought Resistance: very good, Cold Hardiness: excellent
Growth Rate: rapid, Life Span: moderate
Elevational Range: to 8,000 feet
Soil Conditions: good alkaline tolerance
Possible Insect Problems: lilac borer, leaf miners, oyster shell scale
Possible Disease Problems: lilac leaf blotch, powdery mildew, some leaf spots
Wildlife Value: moderately high: songbirds; cover value
Seasonal Color: fragrant purple or white spring flowers
Miscellany: develops into a dense barrier

 

ServiceBerry

Amelanchier spp.          

Growth Form: ovoid to irregular, Crown Density: moderate
Size: 6 feet high 5 foot spread
Drought Resistance: fair, Cold Hardiness: excellent
Growth Rate: moderate, Life Span: long
Elevational Range: to 9,000 feet
Soil Conditions: moist
Possible Insect Problems: pear slug
Possible Disease Problems: leaf spots and rust
Wildlife Value: excellent: big game browse; food value for upland game
Seasonal Color: showy white flowers
Miscellany: native; edible fruit; showy flowers

 

SUMAC (Skunkbush)

Rhus trilobata

Growth Form: irregular, Crown Density: dense
Size: to 4 feet high, to 8 foot spread
Drought Resistance: excellent, Cold Hardiness: excellent
Growth Rate: rapid to moderate, Life Span: moderate
Elevational Range: to 8,000 feet
Soil Conditions: excellent alkaline tolerance
Possible Insect Problems: fairly resistant
Possible Disease Problems: Fusarium wilt
Wildlife Value: excellent: many birds
Seasonal Color: red-orange fall foliage
Miscellany: native; berries have slight lemon taste when rolled under tongue

 

Woods Rose/Wild Rose

Rosa spp.

Growth Form: ovoid to columnar
Crown Density: open, Size: 35-50 feet high 20-35 foot spread
Drought Resistance: poor, Cold Hardiness: excellent
Growth Rate: rapid, Life Span: moderate
Elevational Range: to 11,000 feet
Soil Conditions:
Possible Insect Problems: poplar borer, scale, tent caterpillar, twig gall fly
Possible Disease Problems: cytospora canker, leaf spot
Wildlife Value: high: buds and catkins for food value for grouse and browsers
Seasonal Color: yellow fall color
Miscellany: native

 

Buffaloberry

Shepherdia argentea                   

Growth Form: round to irregular, Crown Density: dense
Size: 10 feet high; spreading
Drought Resistance: good, Cold Hardiness: excellent
Growth Rate: moderate, Life Span: long
Elevational Range: to 7,500 feet
Soil Conditions: tolerates alkaline
Possible Insect Problems: unimportant
Possible Disease Problems: unimportant
Wildlife Value: good: food value; excellent: cover for small game and songbird nesting
Seasonal Color: not conspicuous
Miscellany: native; edible fruit for jellies; forms thickets

 

Native Plum

Prunus americana               

Growth Form: irregular, Crown Density: open
Size: to 8 feet high, to 8 foot spread
Drought Resistance: good, Cold Hardiness: excellent, 
Growth Rate: rapid, Life Span: moderate
Elevational Range: to 8,000 feet
Soil Conditions: good alkaline tolerance
Possible Insect Problems: pear-slug sawfly
Possible Disease Problems: fireblight, powdery mildew
Wildlife Value: excellent: hoofed browsers; nesting cover and food value
Seasonal Color: large white flowers in May
Miscellany: native; delicious edible fruit for jellies and canning; forms a thicket

 

Chokecherry

Prunus virginiana
Growth Form: ovoid to irregular
Crown Density: moderate
Size: 6-20 feet high, 6-20 foot spread
Drought Resistance: good, Cold Hardiness: excellent
Growth Rate: rapid, Life Span: moderate
Elevational Range: to 9,000 feet
Soil Conditions: good alkaline tolerance, suitable for clay
Possible Insect Problems: borers, pear-slug sawfly
Possible Disease Problems: black knot, fireblight
Wildlife Value: high: song and ground birds; good: small mammals, and browse for deer
Seasonal Color: golden yellow to orange fall foliage, Miscellany: delicious edible fruit for jellies and pies; native; can be poisonous to livestock

 

Colorado Blue Spruce

Picea pungens


Growth Form: conical, Crown Density: dense
Size: 60-100 feet high 15-35 foot spread
Drought Resistance: fair, Cold Hardiness: excellent
Growth Rate: slow, Life Span: long
Elevational Range: to 9,500 feet
Soil Conditions: fair alkaline tolerance, coarse, gravelly
Possible Insect Problems: pine needle scale, tussock moth, terminal weevil, gall aphids
Possible Disease Problems: Valsa canker, spruce witches’ broom
Wildlife Value: high: song and ground birds and grouse; hoofed and small browsers
Seasonal Color: bluish evergreen
Miscellany: native; Colorado’s state tree; high ornamental value

 

Cotoneaster

Cotoneaster acutifolia
Growth Form: irregular or hedgelike
Crown Density: dense
Size: 8-12 feet high 5-8 foot spread
Drought Resistance: excellent, Cold Hardiness: excellent
Growth Rate: rapid, Life Span: moderate
Elevational Range: to 9,500 feet
Soil Conditions: good salt and alkaline tolerance
Possible Insect Problems: aphids and grasshoppers
Possible Disease Problems: very resistant
Wildlife Value: good: songbirds
Seasonal Color: yellow spring flowers
Miscellany: does well in poor soils

 
 

Douglas fir

Pseudotsuga menziesii

Growth Form: conical to pyramidal, Crown Density: dense
Size: 70-100 feet high, 20-35 foot spread
Drought Resistance: good, Cold Hardiness: excellent
Growth Rate: slow, Life Span: long
Elevational Range: 6,000 to 9,000 feet
Soil Conditions: Coarse, Gravelly
Possible Insect Problems: spruce budworm
Possible Disease Problems: shoestring root rot; Douglas-fir mistletoe, bacterial gall
Wildlife Value: high: food value for grouse, songbirds and small mammals; browse for deer and elk
Seasonal Color: evergreen           

 

Engelmann spruce

Picea engelmannii

Growth Form: conical to spirelike, Crown Density: dense
Size: 70-90 feet high,  15-30 foot spread
Drought Resistance: very good
Cold Hardiness: excellent, Growth Rate: slow
Life Span: long
Elevational Range: 8,000 to 11,000 feet
Soil Conditions: Coarse, Gravelly
Possible Insect Problems: spruce bark beetle, spruce budworm
Possible Disease Problems: root rot, spruce broom rust
Wildlife Value: high: food value for grouse and songbirds; browse for deer and elk
Seasonal Color: evergreen
Miscellany: native; intolerant of direct sun, requires shade, a better choice in spruce trees for our area     

 

Foresteria/privet

Forestiera neomexicana     

Growth Form: irregular, Crown Density: dense
Size: 10 feet high
Drought Resistance: excellent, Cold Hardiness: good
Growth Rate: moderate, Life Span: long
Elevational Range: to 7,500 feet
Soil Conditions: moist; alkaline tolerance
Possible Insect Problems: unimportant
Possible Disease Problems: unimportant
Wildlife Value: good; fruit valuable to quail, songbirds; excellent cover
Seasonal Color: not conspicuous, Miscellany: native; bluish-black fruit; yellow flowers

 

Golden Currant

Ribes aureum

Growth Form: round to irregular, Crown Density: moderate
Size: 7 feet high 3 foot spread
Drought Resistance: good, Cold Hardiness: good
Growth Rate: rapid, Life Span: moderate
Elevational Range: to 8,000 feet
Soil Conditions: moist
Possible Insect Problems: imported currant worm, oyster shell scale
Possible Disease Problems: blister rust
Wildlife Value: good: food and browse value; nesting cover
Seasonal Color: red to orange fall color; showy yellow flowers
Miscellany: native; edible fruit

 

Red Osier Dogwood

Cornus serica 

Growth Form: irregular, Crown Density: open
Size: to 8 feet high to 6 foot spread
Drought Resistance: fair, Cold Hardiness: excellent
Growth Rate: rapid, Life Span: moderate
Elevational Range: to 11,000 feet
Soil Conditions: not suited for dense clays
Possible Insect Problems: dogwood sawfly, polyphemus moth, oystershell scale
Possible Disease Problems: cytospora canker
Wildlife Value: excellent: grouse, pheasant, turkey, grosbeak, robin, cedar waxwing
Seasonal Color: vivid red fall foliage and stems. Showy white flowers and berries, Miscellany: for moist sites such as streamside riparian areas

 

Golden Willow

Salix alba vitellina               

Growth Form: globular to spreading
Crown Density: moderate, Size: to 35 feet high to 35 foot spread
Drought Resistance: poor, Cold Hardiness: excellent
Growth Rate: rapid, Life Span: moderate
Elevational Range: to 8,000 feet
Soil Conditions: tolerates alkaline and salts well
Possible Insect Problems: aphids
Possible Disease Problems: cytospora canker; bacterial wetwood
Wildlife Value: moderate: song and game birds; food value for buds and twigs
Seasonal Color: orange-yellow bark on young growth in winter, Miscellany: requires moist soil, suckers and spreads 

 

Coyote Willow

Salix exigua                         

Growth Form: irregular, Crown Density: dense
Size: to 10 feet high; spreading, Drought Resistance: poor
Cold Hardiness: excellent
Growth Rate: rapid, Life Span: short
Elevational Range: to 9,500 feet
Soil Conditions: moist
Possible Insect Problems: willow and poplar borers; sawfly galls
Possible Disease Problems: leaf rust
Wildlife Value: high: food and cover for birds; browse value for deer, elk and moose
Seasonal Color: not conspicuous, Miscellany: native; suckers and spreads

 

Flowering Crabapple

Malus spp. (Selkirk)

A rounded canopy of spreading branches, ultimately reaching 10-15 feet in height. The fragrant pink blooms appear in great abundance, and the single, 1.5-inch-diameter flowers are red when in bud but open pink. The blooms are followed in fall by long-lasting, bright red or yellow fruits which are very popular with the birds; can be used to make jelly. Crabapples make a mess of a lawn, walk or driveway when the fruit falls.
Soils: low salt tolerance, clay; loam; sand; acidic; occasionally wet; alkaline; well-drained
Drought tolerance: moderate