The central idea

This page explains a framework developed through the November 2025 GreenSpacesMV Biodiversity and Urban Forest Plan letter. It presents the urban forest as a layered infrastructure system with three connected dimensions: trees and green infrastructure as core civic infrastructure; their role in improving people’s mobility, comfort, health, public space, and climate safety; and their role in supporting biodiversity, habitat, soil health, waterways, and ecological connectivity.

If trees and green infrastructure are treated as civic assets, they become part of the systems that shape usable, resilient streets and connected urban nature.

Living infrastructure for people and nature

The urban forest should not be valued only for the services it provides to people. It also connects nature to nature through habitat corridors, soil health, stormwater systems, and ecological function.

Trees, native vegetation, soils, stormwater systems, habitat, and ecological corridors form a living system. That system should support both people and the natural processes around them.

• connecting people and nature
• connecting nature to nature

Canopy as a public outcome

Planting trees is an activity, but canopy is a long-term outcome. Successful green infrastructure is measured by healthy shade, connected canopy, and public benefits over time.

Canopy should be considered along actual walking, biking, rolling, and transit routes, not only as a citywide percentage.

The distinction matters: planting trees is only the first step. Establishing healthy trees, growing useful shade, creating connected canopy, and maintaining ecological and public benefits are the outcome.

Connecting canopy with mobility

Tree-lined sidewalks, shaded bikeways, cooler transit corridors, and comfortable public spaces can connect people with homes, parks, schools, businesses, transit, services, and nature.

Shade, biodiversity, and mobility should not be delivered through separate projects when they occupy the same public right-of-way.

The urban forest as a system

The urban forest includes more than individual trees. It depends on adequate soil volume and condition, appropriate species and functional diversity, native and climate-appropriate planting, water and establishment care, root and canopy space, protection during construction, coordination with utilities, inspection and maintenance, renewal and replacement, public and private canopy data, and ecological connections between streets, parks, and other green spaces.

Biodiversity and forest health

A resilient urban forest depends on diversity in species, age, structure, canopy form, rooting characteristics, and climate and drought tolerance.

Native planting, pollinator support, habitat connectivity, soil health, and wildlife movement should be treated as functional parts of the system rather than ornamental landscaping.

Infrastructure requires implementation

Calling trees infrastructure has practical consequences. Cities should support the urban forest through capital planning, recurring operations and maintenance funding, asset inventories, soil and condition data, clear departmental responsibility, cross-department coordination, design standards, standard construction details, lifecycle planning, public reporting, and performance measurement.

Adopted plans can remain aspirational unless their goals are translated into project scopes, budgets, standards, responsibilities, and timelines.

Use street projects as opportunities

Whenever a street is repaved, reconstructed, redesigned, or opened for utility work, agencies should consider whether the project can also preserve or expand canopy, provide more growing space, create shade along mobility routes, manage stormwater, add native vegetation, improve habitat connectivity, and make walking, biking, rolling, and transit access more comfortable.

Green infrastructure should shape projects from the beginning rather than being added after the main design is complete.

Measurement and accountability

Outcome measures should include tree survival, tree condition, canopy growth, connected shade, shade along walking, biking, rolling, and transit routes, soil capacity and condition, biodiversity and habitat function, stormwater performance, equitable canopy distribution, maintenance status, replacement needs, public usability, and comfort.

Inventories, funding, standards, and public reporting make these outcomes harder to ignore or defer.

Framework principles

The urban forest is best understood as a distributed infrastructure system—not a collection of isolated landscape objects.

These framework principles are part of the broader Green Complete Streets philosophy in What Are Green Complete Streets, especially Urban Ecosystems, Systems Thinking, and Long-Term Stewardship.