Every Day is Arbor Day… Somewhere

National Arbor Day is April 24, 2020. To honor this holiday, Ellyn Shea takes us through the unexpected history of this event, and points out that the way we celebrate Arbor Day may have more to do with what’s best for politics than with what’s best for trees. – DeepRoot The first Arbor Day in… More

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Come Fly With Me: Drones for Tree Assessment and Care

Unmanned Aerial Vehicles (UAVs) or “drones” evoke a variety of responses from people ranging from anger over privacy invasion to awe over the new perspectives on our world. But like the Force, drones are merely tools that can be used for either the Dark Side or the Light. My interest in drones is related to… More

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The Experience of Silence: Finland Balances Growth and Green

This year’s European Forum on Urban Forestry (EFUF) was held in Helsinki and Vantaa, Finland. The theme “Increasing Cities, Decreasing Green Areas: Challenges to Urban Foresters and Green Professionals” was very appropriate as both cities are expanding rapidly.  Don’t know about EFUF? For 21 years, EFUF has held an annual conference in various European countries,… More

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Soil Assessment in the Field and in the Lab

If you work with trees, you know how important soil is. Understanding a site’s soil is key to plant selection, amendment recommendations, and maintenance planning. But soil science is complex, and analysis takes time and money. Here are a few considerations to help make soil assessment more efficient on a budget.  Divide and conquer. Even… More

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What We Can Learn From the Street Trees of Baltimore

“She said the prettiest place on earth was Baltimore at night…” (“Streets of Baltimore,” Tompall Glaser and Harland Howard, 1966)  The classic country song “Streets of Baltimore” wasn’t originally penned about trees but maybe it’s time to consider a rewrite. These days, street trees in Baltimore are looking better than ever and, between 2007 and… More

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Prepare for the Next Drought: Plant Trees

Waiting for the Rain  As I write this in California, I am looking out at a sunny winter’s day. While the sunshine is pleasant, it reminds me that winter is our rainy season, and we don’t want too many sunny days this time of year.     In the San Francisco Bay Area where I live, we… More

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Which Trees Will We Lose First? Trees Most Vulnerable to Climate Change

Trees can do a lot of amazing things, but they can’t move away when the climate becomes inhospitable. Some can adapt to changing climate, and some can’t.  Which species will be hit the hardest? The most “vulnerable” species are those most susceptible to genetic degradation due to declining populations in the face of adverse environmental… More

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Shades of Green: The Hidden Carbon Cost of Tree Planting and Care

When you work with trees for a living, it’s easy to feel good about your impact on the environment. After all, trees provide us so many benefits including controlling stormwater runoff, reducing urban temperatures and sequestering carbon. However, there is a carbon footprint involved in their production, planting, pruning and ultimate removal. Trees play the… More

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Treequake: A seismic shift in San Francisco urban forestry

Starting July 1, 2017, the City of San Francisco will start doing something it hasn’t done since the 1970s: take responsibility for all the trees in the public right-of-way. San Francisco cut funding to urban forestry in the late 1970s, resulting in a handoff of responsibility to adjacent property owners for two thirds of the… More

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