• Start-up
  • Planning
  • Action
  • Evaluation

Building resilience through intentionally-designed, diverse tree canopies.

This project analyzes the Minneapolis Park & Recreation Board’s public tree planting selection guidelines for street trees to gauge opportunities to increase urban forest resiliency in preparation for future conditions at population, community, and site scales.

Project Area

shot of minneapolis skyline
The Minneapolis Parks and Recreation Board’s forestry department plants, prunes and removes all trees on public property, including nearly 200,000 boulevard trees on 1,100 miles of streets, 400,000 park trees on more than 6,000 acres of land, and trees on other city properties, such as police and fire stations, stormwater retention ponds, and Public Works facilities.

Management Goals

photo of tree-lined street and sidewalk

The overall goal of this project is to ensure the Minneapolis public urban forest provides maximum benefits for current and future residents by being resilient to future conditions.

  • Objective: Analyze Minneapolis Park & Recreation Board public tree planting selection guidelines for street trees to gauge opportunities to increase urban forest resiliency in preparation for future conditions at population, community, and site scales.

Climate Change Impacts

For this project, the most important anticipated climate change impacts include:
The Midwest is expected to experience between 5 and 30 more days per year with a maximum temperature exceeding 95 degrees Fahrenheit by the middle of the century which could stress certain trees and make establishment of new trees more difficult.
Increasing winter low temperatures might lead to a change in hardiness zones that would also for more tree species diversity. It may also lead to increased pest pressure.
Increased precipitation could aid to tree vigor and growth. It could especially help with new tree establishment.
The number of days per year with more than 1 inch of precipitation will increase across the Midwest by the middle of the century which could lead to localized flooding

Challenges and Opportunities

Climate change will present challenges and opportunities for accomplishing the management objectives of this project, including:

Challenges

Trees on challenging sites may need additional resources and care to establish and thrive.

Opportunities

Planned intentional diversity within selections of mostly "No Change" Tree Atlas projections bodes well for urban forest resilience.

Adaptation Actions

Project participants used the Adaptation Workbook to develop several adaptation actions for this project, including:

Area/Topic
Approach
Tactics
Continue to utilize existing street tree planting guidelines which prescribe diversity at multiple scales across the urban forest.
Continue species and cultivar trials, especially with University of Minnesota partnership, to measure success of potential new or rarely used cultivars.
Identify challenging sites for tree establishment, then increase investment on these sites to aid establishment.

Monitoring

Project participants identified several monitoring items that could help inform future management, including:
Arborist and Forester compliance with tree planting guidelines.
Neighborhood scale: 10% genus threshold. Block scale: 5 tree limit per genus.
Asian Longhorned Beetle preferred host genera.
Two to Three annual check-ins/report cards to guide quality assurance. March, July, September

Next Steps

City foresters will continue to invest in quality control, invest more resources to aid in tree establishment on their most challenging sites, and continue investment in our Research and Outreach Partnership with the University of Minnesota. They will also continue to increase outreach to engage and inspire the next generation of Urban Forest decision makers.

Learn More

To learn more about this project, contact
Leslie
or visit:

Keywords

Diseases
Genetic diversity
Insect pests
Planting
Urban

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