Strengthening our Community Tree Canopy Through Education

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Presentation transcript:

Strengthening our Community Tree Canopy Through Education Module #9: Root Barrier Selection & Installation Laura Sanagorski, Environmental Horticulture Extension Faculty

Strengthening Our Community Tree Canopy 2012 Urban Forestry Series This series is a part of a project titled “Strengthening Our Community Tree Canopy Through Education”. This project is made possible by a grant through the 2011 National Urban and Community Forestry Grant Program and the Florida Department of Agriculture and Consumer Services, and the Florida Forest Service.

Root Barrier Selection / Installation

Root Barriers – the Need Installed vertically Prevent root penetration, redirect growth Protection of new and existing utilities Photo: UF Laura Sanagorski

Root Barriers – the Need Tree relocation Deflecting roots near sidewalks Large trees planted near foundations Photo: UF Laura Sanagorski

Root Barriers - Types Chemical Physical Two dimensional Three dimensional Inhibitors – fabric embedded with herbicide (often trifluralin) Traps – (woven nylon / copper screen) allow penetration but not enlargement Deflectors – physical barrier: redirect growth Coarse gravel

Root Barriers: Configuration Linear – Along Narrow Trench Circular – Around ball of Newly Planted Tree Photo: Root Barriers Brisbane Photo: NDS

Root Barriers - Design Vertical ribs – deflect roots downward Locking wings or tabs Newer barriers have more rugged tops Photo: NDS

Root Barriers - Homemade Coarse gravel Tubing Screen Fabric Image: Justin Morganroth

Root Barriers – Testing Treatments Biobarrier – most effective at deflecting roots deeper DeepRoot – not effective in reducing root growth in top 4” of well-drained or poorly-drained soil Polyethylene Plastic - not effective in reducing root growth in top 4” of well-drained or poorly-drained soil Clean gravel- only one effective No effect on root diameter Photo: Biobarrier Adapted from Gilman, 2006.

Root Barriers - Installation Recommended to be done by a qualified tree professional Gilman (2006) recommends installation at deeper than 12”

Strengthening our Community Tree Canopy Through Education Module #9: Root Barrier Selection & Installation Laura Sanagorski, Environmental Horticulture Extension Faculty