23 • Measure the distance A between the line of curbside trees and the center of the sidewalk B. Then from the center of the sidewalk measure the same distance towards the buildings. This is point C, which establishes the line for the second row. • Consider spacing, height and seasonal color when choosing second row trees. A professional arborist should advise on species and sites. • Contact “Miss Utility” at www.missutility.net to mark underground lines which can limit planting space. • Persuade the nearest property owner to care for trees in the “parking,” both to follow city rules and for the good of the trees. Fig. 38 A is line of the street trees. B is the sidewalk center. C is the line of the second row. A C B Tree allées have been lovely features of European roads for centuries In Washington, the ribbons of public land between sidewalks and buildings, called the “parking,” offer additional space for a second row of major trees Along the western two miles of Mass Ave, the 40-foot-wide strip of “parking” proved excellent for growing long-lived second-row trees Early photos show that sidewalk trees and second row trees planted in the 19th and early 20th centuries grew symmetrical allées But then, sidewalk trees had more rooting space than today, when their roots are crowded by underground utilities Today, large-type species such as elm, linden, or oak will grow faster when planted in open ground of the “parking” than in sidewalk tree boxes Being bigger, the second row can more than double the benefits of the street tree row Those hoping to “green” other DC streets should consider the “parking” for a second row of trees City policy has long favored park-like landscaping on this land, as shown by the name!45 Fig. 37 Restore Mass Ave rebuilds both rows of trees. To the right of the sidewalk is a line of willow oaks we planted in the “parking” in front of 2540 Mass. To the left of the sidewalk are willow oaks planted by the city. Both lines were planted in 2007; the photo was taken in 2012. See HistorY: Double rows march westward on page 7. Step 2: Second row gives more than twice the benefit
RkJQdWJsaXNoZXIy MTk3Mzc5Mg==