SHADE TYPE LARGE TREES

Sensation Boxelder Maple Scientific Name: Acer negundo Family: Aceraceae Hardiness Zones 4 to 6. Hardy to -30. Maximum Elevation 9,000 ft.

Photos: Colorado Tree Coalition

Growth habit: Tree has a pyramidal habit as a young tree becoming more elliptical with

maturity. The right angle branching and strong central leader growth habit makes this tree a

good choice for streets and parks. Mature Height: 30-35 ft. Mature Width: 20-25 ft.

Foliage: Young emerging leaves have a reddish-orange color to them giving the tree a

multicolored appearance in the spring and early summer. In the summer leaves are a light

green color. Fall foliage color is orange to red and very showy.

Flowers: Sensation boxelder is a male tree selection. The male flowers are small and grow in

early summer.

Bark: The main trunk is gray and slightly furrowed.

Insects and diseases: No boxelder bugs have been observed on Sensation box elders planted

in western Colorado landscapes.

Landscape value: Since Sensation boxelder is a male tree it is much less attractive to the

boxelder bug. Boxelder trees are usually very tolerant of temperature extremes, drought and

high pH soils, which makes Sensation boxelder an excellent choice for both plains and

mountain communities.

Information sources: Colorado Tree Coalition - Michael Dirr, Manual of Woody Landscape

Plants (University of Georgia, 1990). The Tree Farm

Dakota Pinnacle® Asian White Birch Betula platyphylla 'Fargo' (PP 10,963) (Family Betulaceae) Description: Selected for its narrow columnar to narrowly pyramidal growth habit. Hardier than the species with dense dark green foliage that turns golden yellow in the fall. The bark is white and smooth with slight exfoliation when mature. Dakota Pinnacle® is drought tolerant and has above average tolerance to bronze birch borer and strong winds. Hardiness: USDA hardiness zone 3a-7 Mature Size: Height: 35', Spread: 10-12' Form (Shape): Upright columnar. Growth Rate: Medium - Fast Foliage: Dark green during the summer. In autumn, golden yellow leaves retained until late. Flower: Flowers/fruit are not ornamentally significant. Special Feature: Columnar growth form. Bark color goes through a transitional phase from grayish-orange on 3-year-old stems, orange-white on 6-year-old stems to yellow-white on mature trunks. Light Preferences: Full sun to partial shade Soil Preferences: It is very adaptable to both dry and moist locations. It is not particular as to soil type or pH. It is highly tolerant of urban pollution and will thrive in inner city environments. Landscape Attributes: Deer resistant. Dakota Pinnacle® is recommended for vertical accent elements or specimen tree. Supply mulch and supplementary water in stressful sites. Mulch will assist with winter protection in exposed locations or colder zones. Availability: Widely available in the wholesale and retail nursery industry. U.S. Trademark registered, U.S. Plant Patent (PP 10,963) and Canadian Trademark registered.

Source: North Dakota State University

https://www.ag.ndsu.edu/plantsciences/research/introductions/dakota-pinnacle

Hackberry Celtis occidentalis

Source: http://www.missouribotanicalgarden.org

Family: Cannabaceae Native Range: Central and Northeastern North America Zone: 2 to 9 Height: 40.00 to 60.00 feet. Spread: 40.00 to 60.00 feet Bloom Time: April to May. Sun: Full sun to part shade. Water: Medium to wet. Maintenance: Low Attracts: Birds, Butterflies. Fruit: Edible. Tolerates: Drought, Clay Soil, Wet Soil.

Culture Best grown in moist, organically rich, well-drained soils in full sun. Tolerates part shade. Also tolerates wind, many urban pollutants and a wide range of soil conditions, including both wet, dry and poor soils.

Noteworthy Characteristics

Celtis occidentalis, Hackberry, typically grows with upright-arching branching and a

rounded spreading crown. Trunk diameter ranges from 1-3’. Mature gray bark develops

corky ridges and warty texture. Greenish flowers appear in spring (April–May), with

male flowers in clusters and female flowers solitary. Female flowers give way to an

often-abundant fruit crop of round fleshy berry-like drupes maturing to deep purple.

Each drupe has one round brown seed within. Fruits are attractive to a variety of

wildlife. Birds consume the fruits and disperse the seeds. Fleshy parts of the fruit are

edible and somewhat sweet. Ovate to oblong-ovate, rough-textured, glossy to dull

green leaves (2-5” long) have mostly uneven leaf bases and are coarsely toothed from

midleaf to sharply pointed tip. Undistinguished yellow fall color.

Problems

Hackberry nipple gall is so common that it is often used as an aid in identifying the tree.

Although the galls do not hurt the tree, they often significantly disfigure the leaves.

Witches’ broom (dwarfed, dense, contorted twig clusters at the branch ends) is also

somewhat common. It also does little harm to the tree but can be quite unsightly.

Powdery mildew, leaf spot and root rot may occur. Watch for lacebugs and scale.

Ginkgo ‘Princeton Sentry’

Botanical name: Ginkgo biloba ‘Princeton Sentry’ Princeton Sentry ginkgo: non-fruiting male form; assumes an upright, nearly columnar form that tapers to a point.

Ginkgo is a very pest-resistant tree. It has interesting, fan-shaped leaves that turn vivid yellow in fall. Only male trees should be purchased as the females produce messy fruit that have a potent odor.

Common Names: ginkgo, maidenhair tree Foliage: Deciduous Native Locale: Non-native in America. Native to China. Mature Height: 50 feet or more. Mature Width: Variable. Growth Rate: Slow. Light Exposure: Full sun (6 hrs direct light daily). Hardiness Zones: Zones 4 – 9. (Laramie is Zone 4.) Soil Preference: Moist, well-drained soil. Tolerates: Dry sites, Occasional drought, Alkaline soil, Clay soil, Road salt. Moderately Tolerant: Soil Salt. Intolerant: Poor Drainage. Transplants Well: Yes

Ornamental Interest: Yellow Fall color. Flower & Fragrance: Inconspicuous. Flower arrangement: Male and female flowers on separate trees (dioecious). Tree & Plant Care Relatively low maintenance. Prune in spring. Disease, pests, and problems: No serious pests or problems. Bark color and texture: The bark is typically light gray, with shallow ridges and furrows. Leaf or needle arrangement, size, shape, and texture: Simple, alternate, fan-shaped leaves in clusters of 3 to 5 on spurs or single on long shoots; usually notched at the tip; 2 to 3 inches long.

Source: the Morton Arboretum https://www.mortonarb.org/trees-plants/tree-plant-descriptions/ginkgo

Shademaster® Honeylocust thornless Gleditsia triacanthos var. inermis 'Shademaster'

An open rounded tree with slightly arching branches turning upward at the ends.

Rich, green, fern-like foliage turns yellow in fall.

Photo: Trees on the Move Photo: Paynes Nursery

Photo: Bower & Branch

Mature Size: 30’-50' Tall, 30’-40’ Canopy Width,

Fall Color: Yellow. Tiny leaves and leaflets eliminate raking in the fall.

Flowering Season: Spring

USDA Hardiness Zone: 3, 4, 5, 6 Hardy to -40°F, -40°C

Water Needs: Moderate

Growth Rate: Fast

Sunburst® Honeylocust Gleditsia triacanthos 'Suncole'

Photo courtesy of NetPS Plant Finder

Height: 40 feet. Spread: 25 feet. Sunlight: Full. Hardiness Zone: 4a

Description:

Native North American shade tree species, valued for its delicate, ferny

appearance which casts a dappled shade below. Foliage emerges a brilliant yellow,

fading to light green with a broad spreading habit of growth. It is seedless and

tolerant of adverse growing conditions.

Ornamental Features:

The pinnately compound leaves are highly ornamental and turn an outstanding

yellow in the fall. Neither the flowers nor the fruit are ornamentally significant.

Landscape Attributes:

This is a relatively low maintenance tree and is best pruned in late winter once the

threat of extreme cold has passed. Deer don't particularly care for this plant and

will usually leave it alone in favor of tastier treats. It has no significant negative

characteristics.

It should not be planted underneath power lines. As it matures, the lower

branches of this tree can be strategically removed to create a high enough canopy

to support unobstructed human traffic underneath. It grows at a fast rate, and

under ideal conditions can be expected to live for 70 years or more.

It is very adaptable to both dry and moist locations and should do just fine under

average home landscape conditions. It is not particular as to soil type or pH and is

able to handle environmental salt.

Source: Gertens https://plants.gertens.com/12070009/Plant/806/Sunburst%C2%AE_Honeylocust/

Heritage® Oak Quercus x macdanielii 'Clemons'

Photo courtesy of NetPS Plant Finder

Height: 60 feet. Spread: up to 50 feet. Sunlight Needs: Full Hardiness Zone: 4a

Description:

A large hybrid oak with an upright habit of growth and a strong central leader. Typically,

low-branched, best for larger landscapes where it will have room to grow. Extremely

tough and faster growing than other oaks. A cross between Quercus robur (English oak)

× Quercus macrocarpa (Bur oak).

Ornamental Features:

Heritage® Oak has dark green foliage throughout summer with no appreciable fall color.

Neither the flowers nor the fruit are ornamentally significant.

Landscape Attributes:

Best pruned in late winter once the threat of extreme cold has passed.

Planting & Growing:

It should not be planted underneath power lines. As it matures, the lower branches of

this tree can be strategically removed to create a high enough canopy to support

unobstructed human traffic underneath. It grows at a slow rate, and under ideal

conditions can be expected to live to 300 years or more. Think of this as a heritage tree

for future generations!

It is very adaptable to both dry and moist locations and should do just fine under

average home landscape conditions. It is not particular as to soil type or pH.

Source: Gertens https://plants.gertens.com/12070009/Plant/1225/Heritage%C2%AE_Oak/

TRIUMPH™ elm

Botanical name: Ulmus 'Morton Glossy'

The TRIUMPH™ elm has very good resistance to Dutch elm disease (DED) and is resistant to

elm yellows; it also has good resistance to elm leaf beetle. It is easily transplanted, quick to

establish, and adaptable to most soil types. Large, lustrous, dark green summer foliage gives

way to yellow fall color.

Mature Height: 50-60 feet. Mature Width: 35-40 feet. Hardiness Zones: 4 – 7

Light Exposure: Full sun (6 hrs direct light daily), Partial sun/shade (4-6 hrs light daily).

Soil Preference: Moist, well-drained soil.

Growth Rate: Fast. Transplants Well: Yes. Native Locale: Non-native.

Tolerates: Dry sites, occasional drought, alkaline soil, clay soil, road salt, poor drainage.

Moderately Tolerant: Salt spray and soil salt.

Shape or Form: Vase-shaped.

Tree & Plant Care: Easily transplanted, quick to establish and regain rapid growth. Adaptable

to most soil types unless excessively wet. Avoid pruning elms during the growing season. Do

not plant under powerlines.

Disease, pests, and problems: Elm leaf miner, elm flea weevil and verticillium wilt are

potential problems.

Resistance to disease, pest, and problems: Very good resistance to Dutch elm disease and

resistance to elm yellows; good resistance to elm leaf beetle.

Bark color and texture: Bark is gray, ridged and furrowed.

Flower arrangement, shape, and size: Inconspicuous flowers in early spring.

Fruit, cone, nut, and seed descriptions: Seed in small oval samara (seed case with wings for

wind dispersal).

Source: The Morton Arboretum https://www.mortonarb.org/trees-plants/tree-plant-

descriptions/triumph%E2%84%A2-elm

American elm ‘Princeton’ Ulmus americana 'Princeton'

Photo: www.co.becker.mn.us

Zone: 3 to 9. Height: 50-70 feet. Spread: 30-50 feet. Bloom Time: March to April. Bloom: tiny green. Sun: Full sun. Water: Medium. Tolerates: Drought, Air Pollution Culture Grow in average, medium moisture, well-drained soils in full sun. Tolerant of light shade. Adapts to both wet and dry sites. Generally tolerant of urban conditions. Do not prune during growing season. Do not plant under powerlines.

Noteworthy Characteristics American elm is a vase-shaped, medium to large, deciduous tree. It is native to eastern and central North America. 'Princeton' reportedly has excellent resistance to Dutch elm disease. Non-showy, small green flowers appear in spring before the foliage emerges. Flowers give way to single-seeded, wafer-like samaras (each tiny seed is surrounded by a flattened oval-rounded papery wing). Seeds mature in April-May (possibly early June in Laramie) as the leaves reach full size. Rough-textured, ovate-elliptic, dark green leaves (to 6” long) have toothed margins and asymmetrical bases. Leaves typically turn yellow in fall.

Problems It is susceptible to phloem necrosis which is a disease caused by a phytoplasma that attacks the food-conducting tissue of the tree, usually resulting in a loosening of the bark, wilting, defoliation and death (Not common in Laramie). It is also susceptible to wetwood which is a bacterial disease that results in wilting and dieback. Various wilts, rots, cankers and leaf spots may also occur. Insect visitors include borers, leaf miner, beetles, mealy bugs, caterpillars and scale.

SMALL ORNAMENTAL TREES

Hot Wings Tatarian Maple Acer tataricum 'GarAnn' PP 15023

Photo NetPS Plant Finder

A Very Reliable Tree for Harsh Conditions! Showy red samaras (winged seeds)

shine in bright contrast to the dark green summer foliage of this small tree, which

is an excellent performer in rugged climates. Broadly oval when young, its

branches spread wider than tall, becoming rounded at maturity. Hot Wings

Tatarian Maple has proven to be much more tolerant of high pH soils than other

maples. Nice fall colors ranging from yellow to orange-red. Hardy to - 40°F & C.

VERY WATER THRIFTY!

USDA Hardiness Zone 3 - 7

Growth Rate Moderate

Light Needs Filtered Sun, Partial Sun, Full Sun

Mature Height 20-25 Feet Mature Width 20-25 Feet

Source: The Tree Farm thetreefarm.com

CRUSADER COCKSPUR HAWTHORN CRATAEGUS CRUS-GALLI 'CRUSADER'

Hardiness Zone: 3 to 7 Height: 25 to 35 ft Width: 25 to 35 ft

Description: 'Crusader' has a compact, round, dense form. It is most notably thornless. Cockspur hawthorns are native to North America. It is tolerant to urban pollution, drought, light shade, and a range of soil conditions, if there is good drainage.

The foliage is dark green, changing to shades of scarlet, purple, and orange in the autumn. White flowers bloom in May. The fruits ripen in fall to a deep red and are eaten by wildlife.

Insect problems include aphids, borers, caterpillars, lacebugs, leafminers, red spider mites, and scales. The major diseases for this plant are cedar-apple rust, cedar-quince rust, and fireblight. Other possibilities include apple scab, cankers, fungal leaf spots, leaf blight, powdery mildew, and twig blight. Pesticides and fungicides are available for use when problems are severe, or you have a high value tree.

References:

http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.as....

http://www.thetreefarm.com/hawthorne-cockspur-thornless

Through: University of Minnesota https://trees.umn.edu/crusader-cockspur-hawthorn-crataegus-crus-galli-crusader

Winter King Hawthorn Crataegus viridis ‘Winter King’

Small Ornamental Tree with Outstanding Winter Interest

It would do well anywhere you'd like an ornamental tree but don't have much room. The outstanding feature of your Hawthorn is its winter features. The silver-grey bark tends to peel, revealing an inner peachy-copper hue. This is best exposed after the dark green leaves transform to their golden reds in autumn and fall to the ground. It's in autumn when you'll also notice the ½ inch bright red berries. The berries remain through the winter and are a welcome treat for wildlife. Flowers are clusters of ¾ inch white blossoms with a gentle fragrance. A Hawthorn in your yard during the winter months has the effect of a silvery-grey tree decorated with dangling red berries.

USDA Hardiness Zones: 4 - 7 Mature Height: 25 – 35 feet. Mature Spread: 15 -20 feet. Soil Type: Widely adaptable. Sunlight: Full Sun

Source: NatureHills.com https://www.naturehills.com/winter-king-hawthorn

SUCKER PUNCH® chokecherry Prunus spp. ‘P002S' PP25,767

An improved red leaf chokecherry hybrid which does not sucker. This drought-tolerant

medium-sized tree is adorned with beautiful dark reddish-purple foliage. In spring there

are abundant white small fragrant blooms. The leaves emerge green in spring and

gradually change to purple. The small fruits ripen to deep purple in late July and can be

used for making jams and jellies or left on the tree to provide a favorite food for

songbirds.

Height: 20 - 25 feet. Width: 15 - 20 feet. Flowering Season: Spring.

Flower Color: White. Sun: Full Sun. Water Needs: Moderate to dry.

USDA Hardiness Zone: Zones 3 -8. Soil Type: Clay, loam, sandy

Deer Resistant: No. Good for Pollination: Yes. Winter Interest: Yes

North American Native: Yes. Year Introduced: 2019

Annual Commercial Maintenance: Good growth habit and tends not to exhibit many

crossing branches requiring less pruning maintenance. If pruning is required, use ISA

practices for pruning as plant matures.

Elevation Guide: Up to 7500 ft.

Source: Plant Select https://plantselect.org/plant/prunus-spp-p002s-pp25-767/