The Colorado Trees and Shrubs We Treat

Most Common Species of Ash Trees in Colorado:

Yellow Delicious
Red Delicious
Cox Orange
Granny Smith
Cortland
Fireside
Fameuse
Haralson
Lodi

Pests and Diseases Affecting Apple Trees:

Fire Blight
Apple Scab
Mites
Aphids
Codling Moth Worms

Growing Season for Apple Trees in Colorado:

Spring through early summer

Dormant Season for Apple Trees:

Winter

Most Common Species of Ash Trees in Colorado:

Green Ash
White Ash
Blue Ash

Pests and Diseases Affecting Ash Trees:

Emerald Ash Borer
Lilac Ash Borer
Red-Headed Ash Borer
Ash Bark Beetles
Ash Leaf Curl Aphids

Growing Season for Ash Trees in Colorado:

Blooming occurs May through July

Fruits usually ripen in August

Dormant Season for Ash Trees:

Winter

Most Common Species of Aspen Trees in Colorado:

Quaking Aspen

Pests and Diseases Affecting Aspen Trees:

Hypoxylon Canker

Growing Season for Aspen Trees in Colorado:

Spring

Dormant Season for Aspen Trees:

Winter

Most Common Species of Boxelder Trees in Colorado:

Western Boxelder

Pests and Diseases Affecting Boxelder Trees:

Leaf Spot
Powdery Mildew
Verticillium Wilt
Slime Flux

Growing Season for Boxelder Trees in Colorado:

April and May

Dormant Season for Boxelder Trees:

Winter

Most Common Species of Catalpa Trees in Colorado:

Western Catalpa

Pests and Diseases Affecting Catalpa Trees:

Powdery Mildew
Verticillium Wilt

Growing Season for Catalpa Trees in Colorado:

Spring

Dormant Season for Catalpa Trees:

Winter

Most Common Species of Chokecherry Trees in Colorado:

Canada Red Chokecherry

Pests and Diseases Affecting Chokecherry Trees:

Honey Fungus
Canker
Black Knot
X-Disease

Growing Season for Chokecherry Trees in Colorado:

Plant in fall
Fruit blooms in May

Dormant Season for Chokecherry Trees:

Winter

Most Common Species of Cottonwood Trees in Colorado:

Plains
Narrowleaf
Eastern
Lanceleaf

Pests and Diseases Affecting Cottonwood Trees:

Powdery Mildew
Slime Flux
Cytospora Canker
Leaf Spot
Aphids
Scale Insects

Growing Season for Cottonwood Trees in Colorado:

Cottonwoods pollinate February to May
Pollen season is spring

Dormant Season for Cottonwood Trees:

Winter

Most Common Species of Crabapple Trees in Colorado:

Robinson
Spring Snow

Pests and Diseases Affecting Crabapple Trees:

Scabs
Cedar-Hawthorn Rust
Fire Blight Bacterial Disease

Growing Season for Crabapple Trees in Colorado:

Plant in Spring or Fall
Fruit Blooms in April through May

Dormant Season for Crabapple Trees:

Later Winter

Most Common Species of Elm Trees in Colorado:

American Elm
Siberian Elm

Pests and Diseases Affecting Elm Trees:

Elm Leafminer
Elm Leaf Beetle

Growing Season for Elm Trees in Colorado:

Spring

Dormant Season for Elm Trees:

Winter

Most Common Species of Hawthorn Trees in Colorado:

River Hawthorn

Pests and Diseases Affecting Hawthorn Trees:

Scale
Spider Mites
Fire Blight
Fruit Rot
Rust

Growing Season for Hawthorn Trees in Colorado:

Spring

Dormant Season for Hawthorn Trees:

Winter

Most Common Species of Linden Trees in Colorado:

American Linden
Littleleaf Linden
Redmond Linden
Greenspire Linden

Pests and Diseases Affecting Linden Trees:

The Japanese Beetle
The Linden Aphid
The Linden Borer

Growing Season for Linden Trees in Colorado:

Two week blooming period typically between May and July

Dormant Season for Linden Trees:

Late Winter

Most Common Species of Locust Trees in Colorado:

Honey Locust
Hardwood Black Locust
Purple Robe Locust
New Mexico Locust

Pests and Diseases Affecting Locust Trees:

Cankers
Root Collar Rot
Honey Locust Borer
Honey Locust Spider Mite
Honey Locust Podgall Midge

Growing Season for Locust Trees in Colorado:

May and July

Dormant Season for Locust Trees:

Winter

Most Common Species of Maple Trees in Colorado:

Blaze Maple
Norway Maple
Silver Maple

Pests and Diseases Affecting Maple Trees:

Frost Damage
Chlorosis

Growing Season for Maple Trees in Colorado:

March through April

Dormant Season for Maple Trees:

Winter

Most Common Species of Oak Trees in Colorado:

Gambel Oak

Pests and Diseases Affecting Oak Trees:

Oak Leaf Blister
Cankers
Powdery Mildew

Growing Season for Oak Trees in Colorado:

Mid fall through early spring

Dormant Season for Oak Trees:

Winter

Most Common Species of Pear Trees in Colorado:

Magness
Ayers
Honey Sweet

Pests and Diseases Affecting Pear Trees:

Fire Blight
Pear Scab
Fabraea Leaf Spot
Sooty Blotch

Growing Season for Pear Trees in Colorado:

Plant in spring
Fruit blooms in summer and early fall

Dormant Season for Pear Trees:

Winter

Most Common Species of Evergreen Trees in Colorado:

Blue Spruce
Douglas Fir
Engelman Spruce
Ponderosa Pine
Austrian Pine

Pests and Diseases Affecting Evergreen Trees:

IPS Beetle
Pine Wilt Nematode

Growing Season for Evergreen Trees in Colorado:

Pollinate in May

Dormant Season for Evergreen Trees:

Winter

Most Common Species of Willow Trees in Colorado:

Coyote Willow
Sandbar Willow
Narrowleaf Willow

Pests and Diseases Affecting Evergreen Trees:

Scabs
Blight
Crown Gall
Black Canker

Growing Season for Willow Trees in Colorado:

Plant in Fall
Willows Bloom in February through June

Dormant Season for Willow Trees:

Winter

Most Common Species of Barberry in Colorado:

Colorado Barberry
Japanese Barberry

Pests and Diseases Affecting Barberry Shrubs:

Scale
Aphids
Boxwood Blight
Powdery Mildew
Verticillium Wilt
Anthracnose
Bacterial Leaf Spots

Growing Season for Barberry in Colorado:

Plant late spring through early summer
Spring

Dormant Season for Barberry Shrubs:

Winter

Most Common Species of Boxwood in Colorado:

Korean Boxwood
Littleleaf Boxwood
Common Boxwood

Pests and Diseases Affecting Boxwood Shrubs:

Fire Blight
Nematodes
Leaf Burn
Volutella Blight

Growing Season for Boxwood in Colorado:

Late spring through early summer

Dormant Season for Boxwood Shrubs:

Winter

Most Common Species of Burning Bush in Colorado:

Winged Burning Bush
Dwarf Burning Bush

Pests and Diseases Affecting Burning Bush Shrubs:

Scale
Spider Mites
Powdery Mildew
Crown Gall

Growing Season for Burning Bush in Colorado:

Mid spring to mid summer

Dormant Season for Burning Bush Shrubs:

Winter

Most Common Species of Forsythia in Colorado:

Forsythia Northern Gold
Forsythia Citrus Swizzle
Forsythia Bronxensis

Pests and Diseases Affecting Forsythia Shrubs:

Galls
Twig Blight

Growing Season for Forsythia in Colorado:

Late winter through early spring

Dormant Season for Forsythia Shrubs:

Fall through early winter
Plant in fall

Most Common Species of Hibiscus in Colorado:

Summerific Hibiscus
Hardy Hibiscus

Pests and Diseases Affecting Hibiscus Shrubs:

Aphids
Fungus
Bugs

Growing Season for Hibiscus in Colorado:

Mid to late summer

Dormant Season for Hibiscus Shrubs:

Winter

Most Common Species of Hydrangea in Colorado:

Annabelle
Snowflake

Pests and Diseases Affecting Hydrangea Shrubs:

Scale
Slugs
Aphids

Growing Season for Hydrangea in Colorado:

Spring through early fall

Dormant Season for Hydrangea Shrubs:

Fall through Winter

Most Common Species of Juniper in Colorado:

Rocky Mountain Juniper

Pests and Diseases Affecting Juniper Shrubs:

Cedar-Hawthorn Rust
Twig Blight

Growing Season for Juniper in Colorado:

January through May
Often they have a second summer and bloom again September through December

Dormant Season for Juniper Shrubs:

Does not go dormant

Most Common Species of Lilac in Colorado:

Downy Lilac

Pests and Diseases Affecting Lilac Shrubs:

Lilac Ash Borer
Bacterial Blight
Powdery Mildew

Growing Season for Lilac in Colorado:

Spring

Dormant Season for Lilac Shrubs:

Summer through winter

Most Common Species of Mugo Pine in Colorado:

Dwarf Mugo Pine
Common Mugo Pine

Pests and Diseases Affecting Mugo Pine Shrubs:

Scale
Pine Wilt Disease

Growing Season for Mugo Pine in Colorado:

Spring through Fall

Dormant Season for Mugo Pine Shrubs:

Winter

Most Common Species of Potentilla in Colorado:

Potentilla hybridize so it’s usually difficult to identify to exact species, but they have been named according to the color of flower they produce. Some examples are:
Golddrop
Mango Tango
Pink Beauty
Sunset

Pests and Diseases Affecting Potentilla Shrubs:

Downy Mildew
Powdery Mildew

Growing Season for Potentilla in Colorado:

Bloom summer through early fall

Dormant Season for Potentilla Shrubs:

Winter

Most Common Species of Sea Grasses in Colorado:

Buffalo Grass
Blue Grama
Maiden grasses
Prairie Dropseed
Northern sea oats
Feather reed grass

Pests and Diseases Affecting Sea Grasses Shrubs:

Aphids
Mites
Rabbits

Growing Season for Sea Grasses in Colorado:

Summer

Dormant Season for Sea Grasses Shrubs:

Winter

Most Common Species of Sand Cherry in Colorado:

Western Sand Cherry

Pests and Diseases Affecting Sand Cherry Shrubs:

Japanese Beetles

Growing Season for Sand Cherry in Colorado:

April through May

Dormant Season for Sand Cherry Shrubs:

Winter

Most Common Species of Spirea in Colorado:

Mountainspray

Pests and Diseases Affecting Spirea Shrubs:

Spirea Aphid
Leaf Spot
Fire Blight
Powdery Mildew

Growing Season for Spirea in Colorado:

Bloom in late spring through early summer

Dormant Season for Spirea Shrubs:

Winter

Most Common Species of Yew in Colorado:

Taxus media
Taxus cuspidata

Pests and Diseases Affecting Yew Shrubs:

Phytophthora
Laetiporus sulphureus

Growing Season for Yew in Colorado:

Spring

Dormant Season for Yew Shrubs:

Winter