Last year, Jim Urban wrote a post for this blog entitled Against Mulch. The principle reasons he cited for his position were: 1) Mulch floats and can clog drains and releases “lots of phosphorus” as it breaks down, and 2) work by Gilman et al. that suggest that mulch does not reduce evapo-transpiration. We discussed… More
In 2012 Dŵr Cymru (Welsh Water) committed a £15 million investment in Llanelli and Gowerton to help alleviate the risk of flooding in the area through the adoption of retrofit SUDS, or sustainable Urban Drainage Systems, that utilize greenspace and trees to prevent flooding by allowing rain to soak into the ground or slowly re-enter… More
My blog, The Garden Professors, has an ongoing and lively discussion about invasive plants. Let me state up front that none of the Garden Professors is promoting invasive plants. But the issues surrounding invasive plants are extremely complex and have profound implications for many groups with whom we work in landscape horticulture and urban and… More
Despite modest amounts of annual precipitation, Ireland and Britain are among some of the most perfect places to grow trees. The high latitudes and moderating Gulf Stream of the Atlantic Ocean has insured an exceptionally temperate environment is ideal for most trees, even sub-tropical ones such as palm trees. Never too hot, never too cold,… More
While on a recent visit to northern California, I had the opportunity to interview an energetic young woman who is at the forefront of a pioneering effort to educate fellow arborists on wildlife protection. Megan Morris is a Sacramento native who, after earning a degree in biological aspects of conservation at the University of Wisconsin-Madison,… More
Nature vs. nurture is an old debate in human psychology: are we the way we are because of our genetics or our environment? Plant people know that both environment and genetics play a role in plant development. Perhaps one of the most dramatic examples can be found in the Coast Live Oak (Quercus agrifolia) in… More
Earlier this month I saw a press release issued by the Morton Arboretum that discussed their use on a product containing beet juice to deice roads and trails. The mixture is quicker and less toxic than using salt alone. It sounds like a joke, but it’s not. Beet juice is actually used as an additive… More
We love trees. We also love woodies. For those of you who have been reading this blog for a while, you will know that we promote large volumes of non-compacted, biologically active loam as essential for street tree health and longevity. There are other plants which require soil volume and need attention as well. Vines,… More
How do the stormwater benefits of Silva Cell suspended pavement tree/soil systems compare to the stormwater benefits of traditional bioretention systems? Since the mechanisms by which the tree and soil provide the stormwater benefits in these systems are the same as those in traditional bioretention, we expected the benefits to be comparable as well. The… More
There is a lot of misinformation in the landscape architecture community about whether or not trees roots will grow in gravels, structural stone soils, and clear stone. Our experience indicates that roots will adventitiously grow in any medium given the right set of circumstances. Quantifying and predicting what set of circumstances produce that growth response… More
For the last two weeks in December I’m be re-posting some of my favorite blog posts from this year. Today’s shares some of the most exciting news we got in 2013, when the Washington State Department of Ecology recognized the Silva Cell as being functionally equivalent to a rain garden. Scroll all the way to the… More
For the last two weeks in December I’ll be re-posting some of my favorite blog posts from this year. Today’s post is by Dr. Bert Cregg, Associate Professor in the Department of Horticulture and Department of Forestry at Michigan State University. It was originally published on The Garden Professors and is reprinted with the author’s permission. -LM We’ve… More
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