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It's Arbor Day.
Do you know where the trees are?

The District should look a good bit greener in 25 years if Mayor Adrian M. Fenty realizes his goal of a 40 percent "urban tree canopy" -- or a tree canopy that covers 40 percent of the city as viewed from above -- by 2035. Right now, the District has a fairly healthy 35 percent canopy, thanks to Rock Creek and Fort DuPont parks. But an effort is underway to plant more on private property in hopes of reaping such benefits as reduced air pollution, improved water quality and less demand for energy during the summer. To reach 40 percent by 2035, the District would need to add more than 2,000 acres of canopy, or about 216,000 trees. Casey Trees, a D.C. nonprofit organization that plants, monitors and cares for trees in the District, has contributed to the cause by planting more than 7,000 trees since 2003.
Use this map to learn more about the trees Casey Trees has planted since 2003:

Note: Please upgrade your Flash plug-in to view our enhanced content.
SOURCE: Casey Trees, University of Vermont Spatial Analysis Lab; CREDITS: Map by Kat Downs, Mary Kate Cannistra, Nathaniel Vaughn Kelso and Gene Thorp; Text by Bonnie Berkowitz; Illustrations by Alberto Cuadra. (Printable Version)
Species most planted by Casey Trees
American Elm

American Elm

1,742 planted since 2003
(Ulmus americana)
Mature height: 120 feet
This large, hardy tree grows in all but the western end of the United States and is one of the country's most popular shade tree because it grows quickly in many types of climate and soil conditions.

River Birch

River Birch

(Betula nigra)
422 planted since 2003
Mature height: 40 to 70 feet
Native to the eastern part of the country, red birch grow well in wet soil, making them the perfect choice for planting along rivers and streams.



(Cercis canadensis)
388 planted since 2003
Mature height: 15 to 30 feet
It's hard to miss these smallish ornamentals, which are pink or purple in the early spring as their stems sprout flowers before leaves develop.

Red Maple

Red Maple

(Acer rubrum)
259 planted since 2003
Mature height: Up to 68 feet
Popular with squirrels and people alike, these wide-ranging maples tolerate damp soil and are valuable for erosion control. In early Fall, their leaves turn fiery red.


Black Gum

(Nyssa sylvatica)
254 planted since 2003
Mature height: 60 to 95 feet
Black gum is known for its dense foliage and leathery leaves, growing naturally in a cone shape along its straight trunk. It grows well in the East and lower Midwest.

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