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.
Back in January we posted about a project in Shoreline, WA, where the Silva Cells were being used to extend a sidewalk rain garden underneath paving. This stretch of the project is finally completed! It looks amazing, and we’ve got a case study to tell you all about it.
Suspended pavement trenches with adequate amounts of soil are a great solution for growing healthy, mature street trees — downtown Charlotte and the Christian Science Center in Boston are just two examples of how fantastic the results can be. These two systems are 25 and 43 years old, respectively, and the trees look incredible. Still,… More
The Christian Science Center, on Huntington Ave between Mass Ave and Belvidere Street in Boston, is the oldest suspended pavement installation that we know of in the United States. These trees were planted in 1968, making them 43 years old.
A few weeks ago I was in a meeting with the chief of staff for a San Francisco supervisor. She mentioned that there are entire areas of the city — those that are predominantly Chinese and Chinese-American — where city tree planting is very limited due to cultural beliefs in feng shui. I’d heard the… More
Getting funding for tree planting isn’t always easy. Still, it’s a piece of cake compared to getting funding for tree maintenance. Look at San Francisco, which is on the cusp of turning over the responsibility of their street trees to property owners.
San Francisco has already badly missed the point on trees once, and now it looks like they may be doing it again. According to a Bay Citizen article, Mayor Ed Lee recently proposed heavy budget cuts that include transferring the responsibility for the care and maintenance of 24,000 street trees to property owners.
There is a lot of discussion going around about the benefits of creating shared soil volumes for urban trees — in other words, connecting the rooting areas of two or more trees. Do they benefit? Do they not? In my mind, a shared soil volume is kind of like living in an apartment with a… More
Occasionally we work on Silva Cell projects where the installation of the product and the soil it contains happen far in advance of any trees being planted. In these instances, we often get asked by concerned designers whether the soil biology can be maintained under sidewalks in the temporary absence of trees — and if… More
According to a recent article from Mark Kivner with the BBC, the first scientific study to examine what is commonly known as the nursery effect — that is, identical trees developing differently based on their growing conditions — has been published in the Proceedings of the National Academy of Sciences. Let the “trees don’t forget… More
In Part 1 I talked about the history of Bio Char. In Part 2, I discussed some of the controversy surrounding this soil amendment. Here in Part 3, I’ll look at how you obtain bio char and explore ideas for its future applications in cities. Bio char is made much differently than the charcoal we use… More
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