Trees Conflicts Vince Urbina General Sherman Sequoia is

Trees & Conflicts Vince Urbina

General Sherman Sequoia is the largest tree by volume in the world Still actively growing in Sequoia National Park and estimated to be 2, 000 years old. It is 275 feet tall with a diameter of 25 feet.

The General Sherman Sequoia has everything it needs to thrive • No competition for sunlight • Little competition for water and nutrients • Genetically suited to the growing site • Minimal human interference to the tree • It is the; Right Tree, Right Place, Right Reason

Understanding Tree Roots Small absorbing roots Sinker root Lateral roots Taproot

Roots emerging from a cut root • White roots are new ones growing in response to the cutting • They are just one week old Photo by Edward F. Gilman, Professor, Environmental Horticulture Department, University of Florida

Roots after three years • About ten roots emerging from a cut root after three years may look like this • One or two are likely to become larger than the others in a few years from now Photo by Edward F. Gilman, Professor, Environmental Horticulture Department, University of Florida

Understanding Nursery Stock Available I I Bud grafted trees (46%) Examples: Spring snow crabapple, Skyline honeylocust, Autumn blaze pear or maple Seedlings (32%) Examples: Ponderosa pine, Colorado blue spruce, Bur oak, Catalpa Rooted Cuttings (20%) Examples: Narrowleaf cottonwood, Plains cottonwood, Peachleaf willow Collected Native Trees (2%) Examples: Aspen, Pinyon pine

Traditional nursery stock Container grown Balled & Burlapped

Container Trees Bud Graft #1 pot #20 pots

Right Tree

Colorado blue spruce 80’ tall by 30’ wide

Ponderosa pine 70’ tall by 30’wide

Rocky Mountain native Largest Tree on Aspen City ROW Narrowleaf cottonwood • Diameter at breast height = 53 inches • Condition = Good • Placement = Good • Tree Value =$30, 377 60’ tall by 40’ wide

Tree Benefits and Value - Color

Hardy Ornamental Radiant crabapple 30’ tall by 25’ wide

Bur oak Quercus macrocarpa 50’ tall by 40’ wide

New Shade Tree Princeton Elm

No serious pests YET Kentucky coffeetree 50’ tall by 30’ wide

Urban Tree Diversity Species Key: Aspen Black Locust Sensation Boxelder Narrowleaf Cottonwood Green Ash Japanese Tree Lilac Mountain Ash

Wrong Tree

EAB Detroit MI – 2002 Kansas City KS – 2012 Boulder CO – 2013 Omaha NE – 2016 Sioux Falls SD - 2018

Know Your Soil

Angry Citizen Pruning

Container Inspection Roots should be at container wall but not circling. Before planting make a clean cut on any circling roots to redirect their root growing path.

This is junk – Don’t Buy it

Girdling Root

Right Place

Tree Benefits Cooling • Shaded surfaces can be as much as 20– 45° F cooler than unshaded area. • Evapotranspiration can cool an area 2 – 9° degrees as water moves through a tree • Strategically placed trees can lower cooling costs for structures • Exposed urban surfaces can be 50 – 90° hotter than the surrounding air. Source www. epa. gov/heat-islands

Wrong Place

Look up! Look overhead to make sure you plant the right tree for the right place and right reason. If there is a wire, security light, or building nearby: • • Plant elsewhere, or Plant a small tree with a short mature height Photo by Ed Gilman, Professor, Environmental Horticulture Department, IFAS, University of Florida

Match Tree to the Site Right Tree – Right Place – Right Reason

Right Reason

Shade Seating Inviting Easy Maintenance Safe

Wind, Noise, and Visual Screen

Shadow Planting for EAB

Wrong Reason

Pruning Objective?

Only elms!!!

Mitigating Conflicts

Trees Are an Asset – Let’s NOT Forget It!

Thank You for Inviting Me! Contact: vince. urbina@colostate. edu 970 -250 -1923

Cooling surfaces reduce heat island effect and prolongs life of asphalt

Tree $ Value City of Aspen Tree Inventories – Overall Value of City-owned trees • 1993 – $3, 273, 919 • 1996 – $4, 145, 572 • 2006 – $15, 353, 565 • 2017 – $15, 984, 049 The Tree Value Formula We Use: ISA-RMC Tree Species Value X Basal Area X Species Factor X Condition Factor X Placement Factor = Tree Value

Tree $ Value • • Largest Colorado Blue Spruce in City of Aspen Pioneer Park Diameter at breast height = 37 inches Condition is Good Placement is Good Tree Value = $29, 231

The Buck, Stops Here

Dawn redwood Metasequoia glyptostroboides State Champion Diameter – 27 inches, Height – 44 feet, Spread – 32 feet

Underused Native Engelmann spruce

Underused Native Bigtooth maple

Planting B&B Holes were dug by backhoe 1) Remove at least the top half of basket. 2) Drape burlap down into the hole or remove. 3) Look for problem roots & make clean cut.

Planting Container Trees In Colorado clay plant trees 2 – 3 inches higher than grade.

Downtown Grand Junction Cooling pedestrians and businesses since 1962

To Stake or NOT to Stake? • One year MAX !!! • Not every tree needs to be staked. • Improper staking will lead to a stressed tree. Stressed trees attract pests.

Stake Only When Necessary Interstate 35 – Oklahoma •