Ulmus 'Morton'
Ulmus 'Morton' | |
---|---|
Genus | Ulmus |
Hybrid parentage | U. davidiana var. japonica × U. davidiana var. japonica |
Cultivar | 'Morton' = Accolade |
Origin | US |
Ulmus 'Morton' (selling name Accolade) is an
Description
The parent tree at the Morton Arboretum is noted for the resemblance of its habit to the
Accolade has a propensity to produce co-dominant stems and major branches with bark inclusions, demanding corrective pruning on at least an annual basis where planted in towns.[4]
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Accolade foliage, midsummer
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American Elm (left) and Accolade leaf comparison
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Accolade bark
Pests and diseases
In its 90+ years, the original tree at Morton has survived three epidemics of
Cultivation
Accolade is reputed to grow well in almost all soils save those excessively wet, and is notably drought-tolerant and cold hardy. In artificial freezing tests at the Morton Arboretum[9] the LT50 (temp. at which 50% of tissues die) was found to be −35.5 °C. The tree grows vigorously at first, gaining as much as one metre per annum, but slows to approximately half that rate with maturity. Thus, a typical 20-year-old tree could be expected to have reached 14 m in height with a crown about 5 m in width.[10] Trees grown by Tollgate Education, Michigan State University, at Novi were the most vigorous and robust of the 37 different cultivars and species under assessment, described as looking like 'men among boys'.[11] Accolade is being evaluated in the National Elm Trial[12] coordinated by Colorado State University. Accolade was introduced to Europe in 2006 and is now in commerce in the Netherlands.
Hybrid cultivars
Accolade was crossed with the hybrid cultivar
Synonymy
- Thornhill Elm: Anon.
Accessions
- North America
- Arnold Arboretum, US. Acc. no. 130–2002
- Bickelhaupt Arboretum, US. Acc. no. 98–051
- Brenton Arboretum, US. No details available.
- Chicago Botanic Garden, US. 3 trees, no other details available.
- Dawes Arboretum,[13] US. 1 tree. No acc. details available.
- Holden Arboretum, US. Acc. nos. 89–76, 91–114, 98–23, L–00–501
- Morton Arboretum, US. Acc. nos. 2352–24, 255–74, 128–92, 272–97, 35–98, 280–2003. 495–2004, 1095–2004, 1246–2004, 1347–2004, 269–2008.[3][14]
- Parker Arboretum, US. No acc. details.
- Smith College, US. Acc. nos. 20304, 35804, 37505
- University of Idaho Arboretum, US. 2 trees. Acc. no. 1998008.
- University of Washington campus, US. 5 trees.[15]
- Europe
- Grange Farm Arboretum, UK. Acc. no. 503.
- Great Fontley Farm, Fareham, UK. Butterfly ConservationElm Trials plantation, Home Field, one small tree planted 2010.
- Royal Botanic Garden Edinburgh, UK. Acc. no. 20021372
Nurseries
- North America
- Acorn Farms, Galena, Ohio, US.
- Bailey Nurseries, St. Paul, Minnesota, US.
- Carlton Plants, LLC, Dayton, Oregon, US.
- Charles J. Fiore, Prairie View, Illinois, US.
- ForestFarm, Williams, Oregon, US.
- J. Frank Schmidt & Son Co., Boring, Oregon, US.
- Johnson's Nursery, Menomonee Falls, Wisconsin, US.
- Linder's Garden Center, St. Paul, Minnesota, US.
- North American Plants, Lafayette, Oregon, US.
- Pea Ridge Forest, Hermann, Missouri, US.
- Sester Farms [3], Gresham, Oregon, US.
- Sun Valley Garden Centre, Eden Prairie, Minnesota, US.
- Europe
- Batouwe Boomkwekerijen B.V., Dodewaard, Netherlands. Potted whips.
- Boomkwekerij Gebr. Van den Berk B.V., Sint-Oedenrode, Netherlands.
References
- ^ Fu, L.; Xin, Y.; Whittemore, A. (2002). "Ulmaceae, in Wu, Z. & Raven, P. (eds)" (PDF). Flora of China. 5. Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, USA.
(Ulmaceae through Basellaceae)
- ^ Griffin, J.; et al. (2017). "Ten-Year Performance of the United States National Elm Trial" (PDF). Arboriculture & Urban Forestry. 43(3):107–120. International Society of Arboriculture, Atlanta, US.
- ^ a b "Accolade Elm - Ulmus x 'Accolade'". Cirrusimage.com. Retrieved 20 December 2018.
- ^ Iles, J. (2009). Forget your fear of the elms. Western University website
- ^ Ware, G. Morton Arb. Quarterly, 28(1): 1–5, 1992.
- ^ Giblin, C. P. & Gillman, J. H. (2006). Elms for the Twin Cities: A Guide for Selection and Maintenance. University of Minnesota.
- ^ McPherson, G. et al. (2008). National elm trial: Initial report from Northern California. Western Arborist, Fall 2009, 32–36.
- ^ Brady, C., Condra, J., & Potter, D. (2008) Resistance of Landscape-suitable Elm (Ulmus spp.) Cultivars to Japanese Beetle, Leaf Miners, and Gall Makers. 2008 Research Report, Nursery & Landscape Program, 15–16. University of Kentucky.
- Sakura, Japan.
- ^ Guries, R. P. & Smalley, E. B., (1986), Proc. Third Nat. Urban Forestry Conf., 214–218, 1986, Orlando, Florida.
- ^ "Thinking of ash alternatives? Don't forget about elms". MSU Extension. Retrieved 20 December 2018.
- ^ "National Elm Trial". 26 February 2008. Archived from the original on 26 February 2008. Retrieved 20 December 2018.
- ^ "The Dawes Arboretum - Newark, Ohio". 25 October 2007. Archived from the original on 25 October 2007. Retrieved 20 December 2018.
- ^ "Accolade". Archived from the original on 24 March 2012. Retrieved 20 December 2018.
- ^ "Photograph of autumn colouring of young 'Accolade' elms before Suzzallo Library: Arthur Lee Jacobson, 'Plant of the Month, 2008'". Arthurleej.com. Retrieved 20 December 2018.