DLC Arbor Blog
My Favorite Trees in Denver – Western Catalpa
Bignoniaceae The Western Catalpa is part of the Bignoniaceae family which is known for its showy flowers. Being from the South, I remember walking in a Washington Park on a nice early summer day about 25 years ago and noticing a large tree covered in white flowers. I...
Surprising Tree Count on South High Street
South High Street between Louisiana and Alameda is lined with trees. When the street is walked on foot you will notice that many newly planted trees. It is human nature to notice large things, but the tree landscape along South High Street is in transition. There are...
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...
Potential $1 Billion Economic Impact of The Emerald Ash Borer on Denver County
The Emerald Ash Borer (EAB) has killed tens of millions of ash trees in twenty-one states in the U.S. and two provinces in Canada. These states have spent millions of dollars trying to slow down the spread of this tree insect. The EAB still reached Colorado 11 years...
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
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
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?
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
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...
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