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Is a Better Market Street Just 5 Years Away?

At the end of last month, Mayor Gavin Newsom announced the launch of the Better Market Street Project. Market Street, one of San Francisco’s largest thoroughfares, is at once both a main artery of the city and one of its biggest messes. Congested traffic and mass transit, confusing pedestrian and bike crossings, pathetic (PATHETIC) street trees… More

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Installation Tip: Innovative Ideas for Silva Cell Sites

By Patrick Greeley Now that we’ve seen about 200 Silva Cell projects go in the ground, we’ve learned a thing or two about different ways to go about making these installations a success. Last week we discussed using concrete screws for on-structure sites. Today, we take a look at other innovative ideas we’ve seen along the way.

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Things I Ask Peter MacDonagh: Leidenfrost Effect & Trees

By Rebecca Stevens I recently read a blog illustrating the Leidenfrost Effect (whereby liquids glide on cushions of vapor) by sticking one’s hand in liquid nitrogen. The pictures are amazing as is the video. You are probably wondering why we are talking about the Leidenfrost Effect on the DeepRoot blog.

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How Deep Do Tree Roots Grow?

Click here for a general overview of the factors that influence how deep tree roots grow. Or, continue reading below to dig in to the science a bit deeper. By James Urban, FASLA Here’s an objection we face a lot when working on Silva Cell projects: “Tree roots don’t grow more than 24″ (65 cm)… More

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Photos From Connecting Derby Silva Cell Installation

One overcast and dreary day about two weeks ago, Silva Cells were installed in a tree installation at a car park in Derby, UK. (I was just informed, by the way, that “Derby” is pronounced “Dahr-bee,” much to my embarrassment, thankfully I didn’t say it out loud too often). The Connecting Derby site is a project… More

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Suspended Pavement at the Bartlett Tree Lab, Year 6

Last we checked, the trees in suspended pavement at the Bartlett Tree Lab were doing awesome at 5.5 years. Growing season 6 photos are in and they still look great! (Structural Soil twig on the left, Suspended Pavement twig on the right).

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Trees Help Normal, IL Streetscape Earn Silver LEED-ND

Illinois ASLA “President’s Award – Urban Category,” 2010 U.S. EPA National Award for “Smart Growth Achievement,” 2011 U.S. FTA/FHA “Transportation Planning Excellence Award,” 2012 Landscaping codes that emphasize tree growth, shade, and the minimization of heat-island effect are increasingly taking hold around the twin cities region of Bloomington and Normal, Illinois. The area, which has… More

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Silva Cell Summary of Engineering & Testing

While we don’t usually address super technical issues on this blog, we get asked plenty of questions about the engineering and testing that has been done on the Silva Cell, and rightly so. This product can meet AASHTO H-20 loading standards and is used in applications where strength and compliance with safety and testing standard… More

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Minimizing the Effects of Salting on Urban Trees

In areas where it snows and freezes, salting is a frustrating reality of the road. Salt used for melting ice on pavements in northern climates is quite harmful to trees and soil. The most common and least expensive form of ice melting salt is sodium chloride, which is the same salt we put on our… More

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Tree-Lined Streets Not Worth The Trouble… Er, What?

Every so often I’ll read a take on an important and relevant topic that means well, but just leaves me scratching my head. Such was the case with a recent article in Toronto’s The Star about planting street trees. Let’s start with the title, “Tree-Lined Streets Not Worth the Cost, Arborists Say” — eeeek!

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Trees Grow in Vanouver (Cars)

Back to laboring over here at Deep Root HQ. Mike James, of Deep Root Canada Corp., snapped this picture in Vancouver over the weekend. Looks like an group called the Stick Shift Project — “a collaborative act of urban transformation” — has taken the engines and other guts out of four cars and replaced them… More

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