Principles of Sustainable Design: Tree Roots in the Inner City

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Principles of Sustainable Design: Tree Roots in the Inner City
January 30, 2013 9:00 am
January 30, 2013 12:00 pm
Casey Trees Headquarters
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3030 12th St NE, Washington, DC, 20017, United States

Finding Space for Tree Roots in the Inner City

Trees require an extensive root system to support a large canopy but urban soils are extremely harsh environments that can inhibit tree growth. In the urban area we aspire to achieve large canopies that provide the greatest amount of environmental services. The goal is to maximize tree size while limiting infrastructure conflicts like those between trees and pavement. Since the early 1990s, Cornell University’s patented CU-Structural Soils have been used to grow large trees in tough urban streetscapes. Dr. Jason Grabosky, professor in the Urban Forestry program at Rutgers University, who helped develop CU-Structural Soils, will discuss finding space for tree roots in cities with an emphasis on structural soils to support pavement and the impact of these soils on potential tree growth.


Principles of Sustainable Design Series

This is the first class in a four-part series where experts in the field of sustainable design share specific design features and projects they have been involved with that include considerations for maintaining a healthy urban forest. Learn about sustainable design techniques being used in the District and elsewhere that promote tree spaces that allow for large and healthy trees in urban areas.

Participants can register for each class separately or for the entire series at a discounted price, $50 for all four classes. To receive the discounted rate register under the Series Participant level and you will automatically be enrolled for all four sessions.

Part 2: SITES™ Rating System

Part 3: Soils Below Pavements

Part 4: Landscape Performance Panel


Getting There

The Metrorail station is Brookland-CUA (Red Line) which is a 10 minute walk. The Metrobus stop is near the intersection of 12th and Irving Street NE (served by the H8) or the Brookland-CUA Metro station (served by the H2, H4, H6, G8, R4 and 80). At our office, there is ample street parking and we accommodate bicycles on-site.


Dr. Jason Grabosky, Rutgers University

Who Should Attend?

Open to the general public for those interested in sustainable design practices that relate to the urban forest. Developers, landscape architects, engineers and students will benefit from this more advanced discussion of sustainable design.


All attendees will be provided with a light breakfast. Please note your dietary preferences and/or allergies when registering so we can attempt to accommodate your needs.

Continuing Education Credits

ISA and LACES Continuing Education Credits available.


*Scholarships are available. If interested, please contact Stephanie Juchs at or 202-828-4132*