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DLC Arbor Blog

Denver A City Of Trees – That’s Not Natural

Denver A City Of Trees – That’s Not Natural

Denver was settled in the early 1850s on a high plain grassland. There were no trees then besides the cottonwoods growing along streams flowing through the city. The trees you seen now in Denver were planted. Denver’s dry climate allows American Elms to survive with...

The Stump from Hell

The Stump from Hell

The Ailanthus altissima is misnamed the ‘Tree of Heaven’. Instead, its name should be the “Tree from Hell”. Some people call it a Chinese sumac since it was imported from China to Europe the 1700s. The Ailanthus is tough and tolerant to pollution. It was brought to...

Horse Chestnut Trees

Horse Chestnut Trees

Kids let their parents know that there are Horse Chestnut trees in their neighborhood in two ways. Stepping on a spiny horse chestnut seedpod barefoot is a right-of-passage for kids growing up in Denver. After the tears dry up, some wonder what is inside those thorny...

South High Street Trees – Norway Maple

South High Street Trees – Norway Maple

Acer Platanoides Walling along South High Street from Louisiana Avenue to Alameda Avenue on the east side to Washington Park in Denver will show you that the arbor scape is in transition. About 25 percent of the trees have been planted in the last 10 years. One of the...

Why Do Trees Drop Their Leafs?

Why Do Trees Drop Their Leafs?

Believe it or not, the closest relative to the whale is the Hippopotamus. What does this have to do with tree dropping leaves? Over time, animals and plants adapt to environmental change or to take advantage of an opportunity to better thrive. A great example of...

Biological Control of the Emerald Ash Borer

Biological Control of the Emerald Ash Borer

This little wasp might slow the spread of the emerald ash borer (EAB) in Colorado. Last year the Colorado Department of Agriculture, the City of Boulder and the US Department of Agriculture’s Animal and Plant Health Inspection Service released a stingless wasp to...

Emerald Ash Borer Radio Commercials

Emerald Ash Borer Radio Commercials

Have you heard the radio commercials about the emerald ash borer insecticide treatments? This means two things. Either the EAB is an immediate threat to ash trees or the insecticide company is taking a profit making opportunity by advertising. There is a little truth...

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