Tree of the Month: American Sycamore
Some deciduous trees have a distinctive appearance in the winter, even without their leaves. The American sycamore (Platanus occidentalis) is one of these trees. Several trees are commonly called sycamores, …
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The Jefferson American Elm
The first elm to earn the name ‘Jefferson’ is on the National Mall near the Freer and Sackler Galleries. It stands out for its shape — it has the traditional …
Cultivars of the American Elm
Why do we plant different cultivars of the American Elm? Surely there’s nothing quite like the original Ulmus americana. The classic American Elm is hardy, fast-growing and can grow into …
How to identify and American Elm
How do you know an American Elm when you see one? Here are some characteristics of American Elms that will help you identify these trees on the streets of DC. …
Elm Pruning Workshop Recap
Twenty Casey Trees Citizen Foresters, staff members and other volunteers joined National Park Service horticulturist Barry Stahl on Saturday, January 8, for a tree pruning workshop at Daingerfield Island. This …
Tree of the Month: American Holly
Now that winter is approaching and the leaves of many deciduous trees have fallen, some of the most vibrant trees in our city become more apparent. The American Holly (ilex …
What does it mean? Spray paint on trees & sidewalks
Every so often you may notice spray paint marks on street trees and sidewalks. What do they mean? The District Department of Transportation’s Urban Forestry Administration (UFA), whose mission is …