Summary of storm damage to urban trees in Minnesota

Data Collection Forty-two (42) tree species were documented as damaged by wind and/or ice loading events in Minnesota between March, 1995, and October, 2005.   One thousand five hundred eighty-four (1584) individual sample units (damaged trees) were examined and the following data was collected from each sample unit: date damaged location (community/address) siting (lawn, blvd., etc) species size type of storm* […]

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Nicollet Island brownfield study

Summary of data Principal Investigators: Gary Johnson, Jeff Gillman, Harold Pellett, Chad Giblin, Dave Hanson, Patrick Weicherding.  University of Minnesota. October 2000 through July, 2006 Introduction In October, 2000, 186 trees representing 15 different species were planted in a randomized block design on Nicollet Island, Minneapolis, Minnesota.  The purpose of our study was to evaluate tree performance over a three-year […]

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Stem Girdling Roots: The underground epidemic killing our trees

Download Stem Girdling Roots: The underground epidemic killing our trees (PDF) Gary Johnson, Professor, Urban and Community Forestry, Department of Forest Resources, St. Paul, MN; Dennis Fallon, Vegetation Management Coordinator, Xcel Energy; Andrew Rose, Creative Director, Hand/Eye Communications. How many trees die prematurely each year? Thousands? Millions? Billions? It’s almost impossible to pinpoint, but one unseen culprit – dysfunctional (abnormal) […]

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The Road to a Thoughtful Street Tree Masterplan

By Ken Simons and Gary R. Johnson Download the entire document: The Road to a Thoughtful Street Tree Master Plan (PDF, 6.9MB) and see the accompanying slideshow series, added in December 2011. Down through the ages, the roadside planting of trees has mirrored the order, prosperity and achievements of civilized societies. Man-made row plantings of uniformly spaced trees are evidence […]

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Staking and Guying Trees: Best Materials and Technique

Authors: Gary R. Johnson, Associate Professor, Urban and Community Forestry and Marc A. Shippee, Undergraduate Research Assistant. Forest Resources Extension Department When is Staking Necessary? More often than not, staking is unnecessary. Occasionally, newly planted trees may require staking when: They have abnormally small root systems that can’t physically support the larger, above-ground growth (stem and leaves). The stem bends […]

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