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January 30, 2024

City Trees: Majestic Life Savers

Introduction A red maple tree rises forty feet above the park across the street from my Minneapolis house, a centerpiece around which the children play in its ubiquitous shade. For decades it’s been anchoring the neighborhood’s busiest intersection, its flourishing canopy providing coverage for both the grassy park and its adjacent streets. Few would argue... More

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January 26, 2024

Compaction and Sand-Based Structural Soil (SBSS)

There are many factors that contribute to the failure of urban trees, and many are related to soil issues, such as lack of viable soil, soil volume, and compaction. For my entire career, Landscape Architects have been working with Soil Scientists, Engineers, and Arborists to design urban tree planting techniques to meet specific horticultural, structural,... More

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December 11, 2023

Green Space as Social Infrastructure

Introduction What are the benefits of city trees? One of the first (and most reasonable) responses is that they have a positive environmental impact: not only do mature trees sequester atmospheric carbon, but they improve air quality and assist in stormwater treatment. Trees likewise have an important economic influence, reducing energy usage by providing natural... More

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September 8, 2023

Urban Tree Equity: The Drive to Fair Access

Introduction As the sun blazes on another hot summer day, the thermometer on the east side of town is likely to display the same number as its counterpart three miles west — but this doesn’t tell the whole story. The way we experience heat, particularly in developed urban areas, is influenced by a number of... More

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August 25, 2023

The Limitations of Structural Soil: Why It’s Not the Best Solution for Expanding Total Soil Volume

Introduction The space constraints of dense city environments present a challenge for project planners implementing an urban forestry element. There are, however, a number of solutions to help improve conditions for healthy tree growth. The Silva Cells are one such choice, a suspended-pavement system allowing for maximum soil volume. Another option is structural soil —... More

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August 22, 2023

Using Silva Cells with Green Roofs and On-Structure Applications

Silva Cells and On-Structure Installations The DeepRoot Silva Cell system has been installed in dozens of rooftop and on-structure projects around the world. Whether on top of existing structures — such as parking garages — or a garden terrace atop a new construction project, Silva Cells can help create structure as well as bioretention for... More

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August 11, 2023

Tree Watering Bags: Are They Worth Using?

In the July 2019 issue of ISA Arboriculture & Urban Forestry magazine, Hossain, Stuhlinger, Olson, and Babst contributed, “A Comparison of Indirect Water Devices for Benefiting Newly Transplanted Urban Trees.” Urban trees often undergo a period of post-transplant stress which is exacerbated by a water-limited environment. Watering devices are available to help a newly planted... More

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July 27, 2023

Comparing Silva Cells and Structural Soil

We get asked to compare Silva Cells to CU Soil with some frequency. It’s a comparison that we always hesitate to make, because to us it’s really a case of apples and oranges. While they may seem to be solutions to the same challenges, there are some very significant differences that affect their value and performance for tree growth... More

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July 26, 2023

Silva Cells Support Trees at Bomber Command Memorial

Introduction “The fighters are our salvation but the bombers alone provide the means of victory.” Winston Churchill’s words from September 1940 were prophetic, an early forecast of the indispensable role these aircraft would play in the triumph over Nazism in World War II. Dedicated to the courageous veterans of the Bomber Command, a bronze memorial... More

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July 24, 2023

Royal Tyrrell Museum: Dinosaurs and Silva Cells

Introduction It’s August 12, 1884, and geologist Joseph Tyrrell — on the hunt for coal seams in Alberta’s Red Deer Valley — discovers something far different: the first dinosaur fossil ever found in the region, later named the Albertosaurus for its geographical lineage. A hundred years later, the Tyrrell Museum in Drumheller, an homage to... More

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