City Trees

January/February 2017

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36 City Trees Announcing the SMA Urban Tree of The Year: Chestnut Oak The 2017 SMA Urban Tree of the Year is native to much of the Eastern United States. Hikers from New York to Tennessee who ascend to dry ridges will often see the deeply furrowed, blocky barked trunks of chestnut oak (Quercus mon- tana) (syn. Q. prinus). The bark is so distinctive, it may be the only ID feature one needs. There's growing interest in using chestnut oak in the urban environment because it is pH-adaptable, handles dry soils and periods of drought, has a beautiful mature form, requires mini- mal pruning, and tends to be free of major pests and diseases. The common name "chestnut oak" owes to the leaves looking like those of American chestnut (Castanea dentata) and indeed both are members of the beech family, Fagaceae. Other com- mon names for chestnut oak include rock oak, rock chestnut oak, or mountain oak—referring to its customary sighting in dry, rocky soils on ridgetops, where it has a competitive advantage. However, if chestnut oak is open-grown in the moist, well- drained soil that all trees dream about, it will be significantly bigger than its scrappy ridgetop cousins. Typically it reaches 50 to 70 feet (15 to 21 m) tall and almost as wide. It's hardy in USDA Zones 4 to 8 and prefers full sun. Dublin, Ohio Forestry Assistant Jocelyn Knerr nominated the tree. "We started using chestnut oak in Dublin in 2009 as a street tree," she says. "We have planted it to replace some of our ash trees as well as using it in greenspaces throughout the city. It has adapted well to the alkaline soils of Dublin and it seems to handle the salt well. The pyramidal shape is an added plus in its young age because it allows for our snowplows and garbage trucks to pass without destroying any branches." Frankfort, Kentucky Urban Forester Lorri Grueber was thrilled to learn that a native tree was named SMA Urban Tree of the Year. "Many times, especially in urban settings, we turn to non-native species and then 10-20 years down the road we regret doing so, due to their invasive qualities," she says. "With Q. montana we won't have those regrets." Grueber recommends giving chestnut oak ample room to spread its branches—for example, in large tree lawns, wide medians, or large parking lot beds. "You may also consider using structural soil to guide and protect the root sys - tem," she says. In terms of ornamental features, Grueber says, "Its habit provides an inviting canopy, it has glossy leaves in the sum- mer, and it affords fabulous winter interest with the rugged bark." Westerville, Ohio Parks and Urban Forest Manager Matt Ulrey is also a fan. "Chestnut oak adds to the variety of oak options for the urban setting," he says. "It has shown itself to be tolerant of the variety of harsh conditions placed on a street tree. At matu- (right) The stately habit of chestnut oak • Photo courtesy Cornell Woody Plants Database Chestnut oak acorn • Photo by Keith Kanoti, Maine Forest Service, Do the leaves remind you of those of the American chestnut? • Photo courtesy Missouri Botanical Garden

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