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Success Factors For Civilian Urban Tree Care

A natural forest depends on a variety of partnerships between plants, animals, fungi and micro-organisms. An urban forest depends on a similarly complex series of partnerships, albeit mostly between humans. Many biological factors affect the survival of an urban tree. I want to compare two studies involving community forestry programs about young urban tree establishment… More

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What Kind of Arborist Do You Need?

If you’re involved with an urban development project, chances are trees are also involved in some way, depending on the local municipal codes. Existing trees may need to be protected or require a permit for removal. Many municipal codes require a Certified Arborist to evaluate all or some of the trees on site and write… More

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Buried Treasure: Conserving Urban Soil in Place

It’s not unusual to find a piece of art or jewelry over 500 years old in a museum’s collection. These precious artifacts are (rightly) treated with great care commensurate with their value. Yet an inch of topsoil, which may have taken more than 500 years to develop, is commonly abused, mismanaged or discarded in the… More

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What is “Good” Soil?

What does “good” soil mean? It depends on your point of view. If you are engineer, you like soil that drains well or compacts easily to bear weight. If you are a farmer, you want soil that is fertile, easy to till, and soaks up water without runoff. If you are a tree… well, what… More

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If Not Now, When?

Unless you’ve been living under a rock for the past 3 years, you know that California is having a major drought. According to the Institute for Public Policy, the three-year period between 2011 and 2014 were the driest on record since record keeping began in 1895, made worse by record high temperatures in 2014. It’s… More

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Don’t Believe the Hype (Unless It’s Supported by Science)

Humans have been managing plants for thousands of years – watering, saving seeds, protecting plants from herbivores. We began learning about horticulture initially through observation. Some of our observations were correct, such as which plants needed lots of sun and which could grow in the shade. Others, such as adding sugar to the soil for… More

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Tweet This! Resources for Tree Professionals About Bird Safety

The sound of birds in trees is so ubiquitous we may not think about the strong connections these organisms have with one another. Birds need urban trees for food, nesting and protection. Those who work with trees may not be aware that certain tree pruning activities can endanger nests and remove habitat for our feathered… More

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Beyond “Green Side Up” Four Reasons Your Trees May be Failing

You’ve done your site analysis and ensured enough rooting volume for the tree.  You spent time carefully selecting the right species and cultivar. You’ve even inspected nursery stock and rejected specimens with uncorrectable root defects. In other words, you tried to do everything right. Yet six months later, the trees don’t look so good. What… More

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One Trees forgotten art project

OneTrees: The Forgotten Tree Art Project

The other day, I passed a dead street tree in San Francisco Not an uncommon occurrence unfortunately, but this tree had once been on TV. The tree, a Paradox walnut, had been planted along with a second tree next to it as part of an art/science project called OneTrees designed by Natalie Jeremijenko. Jeremijenko cloned… More

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To Live and Die Among Trees

Quick – name three important types of urban open spaces…public parks, community gardens, umm…roof gardens…how about cemeteries? While making space for the living invariably involves destruction of open space, the space we make for the dead can be a uniquely important part of the urban forest. We owe our historical cemeteries a great deal in… More

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The Champion and the Elf: Variability of the Coast Live Oak

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

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