Development necessarily creates giant swaths of constructed areas that have no unifying ecosystem. It also disturbs existing natural areas that are part of the natural cycling of water, minerals, chemicals, plants and animals. Yet despite these complications, density is valuable in terms of impact mitigation on a per-person basis, as least as far as pollutant… More
All areas of study and their industries have to cope with inaccurate but often widely accepted mythologies, and arboriculture is no exception. There are a few of these that we encounter again and again. We’ve already busted the myth that tree roots don’t grow very deep, but here’s another one: do deep soils increase the risk… More
In February, the U.S. Forest Service published a report indicating that cities around the country are losing around 4 million trees per year. Of the 20 cities included in the study, 17 showed significant losses of canopy cover, and 16 showed significant increases in impervious hardscape (or paved surfaces that don’t absorb water). At the same time,… More
Last month’s Landscape Architecture Magazine had an interesting feature by Mike Singer. The article, titled “Are We Done Yet? Measuring for a project’s success is keeping clients and designers engaged well after installation,” explores an emerging trend in the field: extended contract periods to address the long-term success and performance of the site’s landscape.
This post is now out of date! Please see the updated post here. In the day-to-day, we can become so focused on what isn’t working with the way we design and plant street trees that it can be difficult to focus on the people and places that are actually doing right by them. It’s just so… More
As an urban trees and soils consultant, I am always looking for studies that examine how trees survive and adapt to the built environment. One of the biggest questions and confusions I encounter is the issue of whether organic matter (something that I discussed in a previous post) needs to be added to urban… More
Part 1 of this blog series summarized recent studies in Minnesota, Connecticut, New Hampshire, and King City, Ontario, which all found that the difference between summer and winter performance of bioretention systems is not substantial, even on sites with severe winters. Now that we know that, how do we go about maximizing bioretention performance in… More
You don’t need much experience in arboriculture or landscape design to notice that planting trees in cities is very different from planting trees in forest environments. There are many reasons for this, but perhaps the biggest is the difference in composition of the soil.
This hydrograph (diagram showing runoff flow versus time) compares the intense spike of a stream during a storm in an urbanized watershed without adequate controls, with the “gentle rolling hill” appearance of a forested watershed’s response to the same storm. Note the loss of dry weather base flow for the stream in the urbanized watershed…. More
Here are this year’s photos from the Bartlett Tree Lab study comparing different planting methods for urban trees. For comparison, check out last year’s set. And for a fuller chronological picture, you can see all the photos up to that point in this post.
Soil. Stormwater. Sustainable Infrastructure.
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