Here is this year’s photo from the Bartlett Tree Lab study comparing different planting methods for urban trees. This year, we can also share a graph that demonstrates just how well the trees growing in suspended pavement are doing relative to the other treatments.
This independent study was set up by Dr. Tom Smiley to test how well trees fare in different growing media. The trees are monitored and tracked from year to year to measure their leaf extensions, height, DBH, and more.
Here are the photos of the study over the last nine years.
To see these photos, as well as many more from 2004 onward, here.