How Much Soil Does a
Parking Lot Tree Need?
Contact:
Todd Prager, AICP, ISA Certified Arborist
Phone | 971.295.4835
Email ...
Trees Need Soil to Grow

Graph Source: USDA Forest Service Center for Urban Forest Research
Soil Volume & Crown Diameter

10 ft Crown
100 cu ft Soil

21 ft Crown
500 cu ft Soil
Source: Casey Trees

30 ft Crown
1,00...
Soil Volume & Crown Diameter

20 ft Crown
450 cu ft Soil

5 ft Crown
40 cu ft Soil

40 ft Crown
2000+ cu ft Soil
Source: R...
Soil Volume & Crown Diameter

Source: Real World, Tigard
Tree Roots Don’t Generally Grow Under Pavement

http://www.flaroccaandsons.com/images/COM/lg/60,000-sf-Parking-Lot-Paving-...
Tree Roots Don’t Generally Grow Under Pavement

Graph Source: Up by Roots, James Urban
When Tree Roots Grow “Out of the Box”

AC surface
Aggregate base

Subgrade

Roots growing in base layer
lifting curb and a...
Options for Tree Roots Under Pavement
Options for Tree Roots Under Pavement
Options for Tree Roots Under Pavement

Structural Soil

Source: Deep Root– Silva Cell - http://www.deeproot.com
Options for Tree Roots Under Pavement

Structural Soil

Source: Cornell University – CU Structural Soil - http://www.hort....
Options for Tree Roots Under Pavement
Comparison after 10 years of growth
Olympia, WA

Control Trees

Trees with
Structura...
Canopy Deficient Commercial/Industrial Zones

Branching Out:

Urban Forest Planning
Canopy Deficient Commercial/Industrial Zones

Branching Out:

Urban Forest Planning
Canopy Deficient Commercial/Industrial Zones

Branching Out:

Urban Forest Planning
Parking Lot Greening

Existing Citywide Canopy (2007) – 25%
Citywide Canopy Goal (2047) – 40%
Parking Lot Greening

30% Canopy
Min. Per Parking Lot
&
1000 cu ft Soil Volume
Min. Per Tree

Branching Out:

Urban Forest...
Soil Volume Strategies
Soil Volume Strategies
Soil Volume Strategies
Questions?

Contact:
Todd Prager, AICP, ISA Certified Arborist
Phone | 971.295.4835
Email | todd@toddprager.com
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Parking Forest Tree Needs

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The Parking Forest is an assembly of materials to incorporate trees and stormwater management into parking lots without losing parking spaces. This presentation was presented by Todd Prager of Prager & Associates and is posted with his permission.

Published in: Design, Technology, Business
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Parking Forest Tree Needs

  1. 1. How Much Soil Does a Parking Lot Tree Need? Contact: Todd Prager, AICP, ISA Certified Arborist Phone | 971.295.4835 Email | todd@toddprager.com
  2. 2. Trees Need Soil to Grow Graph Source: USDA Forest Service Center for Urban Forest Research
  3. 3. Soil Volume & Crown Diameter 10 ft Crown 100 cu ft Soil 21 ft Crown 500 cu ft Soil Source: Casey Trees 30 ft Crown 1,000 cu ft Soil
  4. 4. Soil Volume & Crown Diameter 20 ft Crown 450 cu ft Soil 5 ft Crown 40 cu ft Soil 40 ft Crown 2000+ cu ft Soil Source: Real World, Tigard
  5. 5. Soil Volume & Crown Diameter Source: Real World, Tigard
  6. 6. Tree Roots Don’t Generally Grow Under Pavement http://www.flaroccaandsons.com/images/COM/lg/60,000-sf-Parking-Lot-Paving-4.gif Pavement Profile AC surface Aggregate base Subgrade Compaction requirements (90%-95% Proctor Density) are root limiting
  7. 7. Tree Roots Don’t Generally Grow Under Pavement Graph Source: Up by Roots, James Urban
  8. 8. When Tree Roots Grow “Out of the Box” AC surface Aggregate base Subgrade Roots growing in base layer lifting curb and asphalt
  9. 9. Options for Tree Roots Under Pavement
  10. 10. Options for Tree Roots Under Pavement
  11. 11. Options for Tree Roots Under Pavement Structural Soil Source: Deep Root– Silva Cell - http://www.deeproot.com
  12. 12. Options for Tree Roots Under Pavement Structural Soil Source: Cornell University – CU Structural Soil - http://www.hort.cornell.edu
  13. 13. Options for Tree Roots Under Pavement Comparison after 10 years of growth Olympia, WA Control Trees Trees with Structural Tree Soil
  14. 14. Canopy Deficient Commercial/Industrial Zones Branching Out: Urban Forest Planning
  15. 15. Canopy Deficient Commercial/Industrial Zones Branching Out: Urban Forest Planning
  16. 16. Canopy Deficient Commercial/Industrial Zones Branching Out: Urban Forest Planning
  17. 17. Parking Lot Greening Existing Citywide Canopy (2007) – 25% Citywide Canopy Goal (2047) – 40%
  18. 18. Parking Lot Greening 30% Canopy Min. Per Parking Lot & 1000 cu ft Soil Volume Min. Per Tree Branching Out: Urban Forest Planning
  19. 19. Soil Volume Strategies
  20. 20. Soil Volume Strategies
  21. 21. Soil Volume Strategies
  22. 22. Questions? Contact: Todd Prager, AICP, ISA Certified Arborist Phone | 971.295.4835 Email | todd@toddprager.com

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