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(Celtis Occidentalis) Announcing the 2020 SMA Urban Tree of the Year

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(Celtis Occidentalis) Announcing the 2020 SMA Urban Tree of the Year savatree.com Announcing the 2020 SMA Urban Tree of the Year: Hackberry (Celtis occidentalis) Study Area Outline This map, indicating tree canopy Census Block Groups prioritization, addresses the need Tree Canopy Prioritization for green infrastructure, heat island Compiled by Michelle Sutton, City Trees Editor Highest Priority relief and environmental justice. It factors in corresponding maps with the following variables: minority Red gum (Eucalyptus camaldulensis) The experienced Medium populations, median household arborist can tell right away that this tree was topped decades income, impervious surfaces, ago, with the resulting shoot growth making up most of surface temperature and existing Lowest Priority tree canopy. the canopy. The homeowners were unconcerned with the Each fall, risk it posed. They like the shade and they don’t give a hoot SMA members nom- about having to rake leaves. I love homeowners like that! inate and vote for the Urban Tree of the Year; in 2020, the Where are the trees winner of that distinction is hackberry (Celtis occidentalis). in your city? In this tribute to the humble and hardworking hackberry, we SavATree can help you look at the distribution hear from New York Tree Trust of tree canopy across your city and relate it Development Director James to the biophysical and Kaechele; State of Wyoming Community Resource Forester social environment. Tara Costanzo; Upper Arlington, Mapping is a tool Ohio Parks and Forestry to inform program, Superintendent Steve Cothrel; City of Oak Creek, Wisconsin policy, and practice to Urban Forester Rebecca Lane; identify opportunities Hamilton, Ontario Supervisor of for increasing Urban Forestry Tami Sadonoja; environmental equity. Cornell Urban Horticulture Institute Director Nina Bassuk We can assist with and City Trees Editor Michelle both mapping and Sutton; and Virginia Tech practice support. University Arborist Jamie King. Ficus (Ficus microcarpa): This gnarly street tree personifies the tough life of an urban tree. It appears to have been MEMBER James Kaechele with hackberry street tree in Syracuse, hit by vehicles more than once, but is still thriving. Contact us New York. Photo Courtesy James Kaechele What’s more is that in spite of all that it has endured, it is still providing significant environmental benefits. (888) 750-7977 www.savatree.com/consulting www.urban-forestry.com 35 Trees | Shrubs | Lawn | Deer | Ticks | Consulting This fine native tree is an underestimated contributor to many an urban forest. With a wide native range from New England through the Mid-Atlantic and west to Wyoming, hack- berry grows in rocky, alkaline sites where other trees may struggle. It weathers cold and windy winters to USDA Hardiness Zone 2 and Hackberry native range. Public domain sweats the hot summers of Zone 9; it seems equally happy curbside in Toronto as it does in a Washington, D.C. neighborhood park. Hackberry’s mature size varies correspondingly This year, the City of Hamilton, Ontario planted 252 with planting location, commonly growing to 40 hackberry trees, consisting of common hackberry (Celtis to 60 feet (12 to 18 m), with exceptional spec- occidentalis) and the columnar ‘Prairie Sentinel’. These imens approaching 100 feet (30 m). The most trees perform well in our parks, open spaces, and streets- handsome hackberry in New York City grows capes. Tolerant of dry conditions, the leaves will wilt under along the Mosholu Parkway; it approaches sustained drought, but recover quickly once watered. 80 feet (24 m) in height, with remarkable Hackberry fruit. Photo by Gmihail via Wikimedia Commons The species is very urban tolerant and with its bark American elm-like branching structure. developing into corky ridges with age, it provides Alongside measurable ecobenefits like cleaning multi-season interest. Fleshy, deep purple drupes air and water, hackberry provides a home ripen in early autumn and are favoured by birds. and food to many native creatures. Songbirds This may lead to some property owners expressing (and humans) snack on the ripe, small, ber- concern over the resulting seed dispersal. ry-like drupes that are high in protein and — Tami Sadonoja, Supervisor Urban somewhat sweet. Hackberry leaves support Forestry, Hamilton, Ontario the life cycle of numerous gall-producing insects; the resulting gall-ridden leaves are more of an unsightly irritation than they are In our region (greater Columbus, Ohio), hackberry is an detrimental to the tree’s health. Perhaps this unsung workhorse. It is native here, and in some land- informs where to plant hackberry: anywhere scapes, very common as a volunteer or as a mature folks are not looking too closely at the leaves. tree that survived nearby development as neighbor- hoods rose from fields and forests. Hackberry seems There are a number of cultivars that claim to thrive without pampering, and it is particularly improved resistance to galls and witches’ common in neighborhoods along the rivers that flank brooms; others are selected for form and vigor. the east and west borders of Upper Arlington. The upright form of ‘Prairie Sentinel’ fits into a spot that may be too skinny for a full-width Many of these sites feature shallow, alkaline soils over tree. The increased vigor of ‘Magnifica’ is limestone bedrock, and hackberry tolerates the high soil nice but comes with a reduced cold hardiness pH better than almost any other species. Upper Arlington owing to its mixed parentage from C. laevigata, Parks & Forestry Supervisor Samantha Simmons has been known through the South as sugarberry. For a strong proponent for years. She says, “It’s about time me, planting out seedling grown hackberry is a that the humble hackberry receives some overdue praise; fine choice if that’s what you have available. too many people overlook its many marvelous qualities!” — James Kaechele, New York — Steve Cothrel, Parks & Tree Trust Development Warty-corky bark of hackberry. Appressed buds and prominent lenticels Forestry Superintendent, City Director, NYC Parks Photo by Michelle Sutton of hackberry. Photo by Michelle Sutton of Upper Arlington, Ohio 36 CityTREES www.urban-forestry.com 37 The SMA 2020 Urban Tree of the Year designation rec- ognizes hackberry (Celtis occidentalis) for its service to urban forests and encourag- es its use when matched ap- propriately to site and as part of a diverse urban tree inven- tory. You can see the full list Alternate foliage of hackberry, shown here in of past Urban Tree of the Year fall season. Photo by Michelle Sutton winners on the SMA website. Winter silhouette of mature hackberry on Transplanting hackberry Virginia Tech campus. Photo by Jamie King In the late 1990s, Cornell Urban Horticulture Institute (UHI) conducted a study comparing balled-and-burlapped (B&B) and hydrogel-dipped bare root (BR) trees harvested at 1.5-inch/40 mm caliper and planted in pairs in the urban environ- ment of Ithaca, New York. Half of the B&B-BR pairs were planted in spring, half I remember years ago finding a hackberry near Buchanan, Virginia when in fall. One of the species studied was hackberry (Celtis occidentalis). our team was conducting an i-Tree inventory; we were surveying for With growth measurements repeated in years 1, 2, and 3, and with anecdotal observa- street trees but we got distracted by a HUGE hackberry tree by a stream. tion in years since, we found that hackberry can be successfully transplanted in fall or Since that encounter, I have admired this species. I further observed spring, B&B or BR. However, we found that fall-planted BR hackberry had a slight edge hackberry trees while I was working for the City of Roanoke. I’d see vol- over spring-planted BR hackberry, and that when it came to spring planting, B&B hack- unteer specimens across the park system and noted how they required berry trees grew somewhat better than BR hackberry trees. We concluded that if a very little maintenance. We routinely cleaned up downed branches from community wants to try planting BR hackberry trees in order to save resources, preserve other species, but I do not recall having to do that for hackberry trees. fine root systems, and allow more public participation, they should do it in the fall. I remain impressed by the rounded vase shape, distinctive bark char- It is important to note several caveats. BR trees were hydrogel dipped per the acteristics, and site tolerances of this year’s SMA Urban Tree of the process described in the UHI booklet, Creating the Urban Forest: The Bare Root Year. Sure, the species may be afflicted by “ugly” nipple galls or more Method. The dipping procedure is a critical element in the handling of BR trees. serious witches’ brooms, but chances are that hackberry will tolerate Because we do not assume that larger-caliper BR trees would perform the same the alkaline soils, disturbed soil profiles, and heat/drought condi- way as small-caliper trees, only trees under 50 mm (2 inches) caliper should be tions that challenge so many other species. Most of the improved used to ensure survival and transplanting success. Trees of any caliper must receive hackberry cultivars are reported to resist the witches’ brooms adequate early maintenance in terms of weeding, mulching, and watering. and galls, while retaining those valuable urban site tolerances. — Dr. Nina Bassuk, Urban Horticulture Institute While I am no longer managing as many street trees, I have begun Director, and Michelle Sutton, City Trees Editor developing the campus tree management program at Virginia Tech. One of the first species I searched for in the inventory was hackberry; we have several fine examples on campus, mostly in “My experience with hackberry over the years is that it is not as drought naturalized areas, with a few standouts in more challenging, high- tolerant as reported. In a droughty situation, the leaves can become some- traffic locations (see photo).
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