Ulmus davidiana var. japonica 'Burgundy Glow'
| Ulmus davidiana var. japonica 'Burgundy Glow' | |
|---|---|
| Variety | Ulmus davidiana var. japonica |
| Cultivar | 'Burgundy Glow' = Northern Empress |
| Origin | US |
The Japanese elm cultivar Ulmus davidiana var. japonica 'Burgundy Glow' (sold as Northern Empress) was raised from a 1978 seed batch from Heilongjiang Province, China, selected at North Dakota State University Dale E. Herman Research Arboretum, Absaraka, described in 2017,[1] and released in 2021.[2] It is notable for its burgundy fall colour, rare in elms where yellow is the norm, for its cold-hardiness, and for its "good" resistance to Dutch elm disease.
NDSU report it superior in cold-hardiness to the hybrid cultivar 'Frontier', which also has wine-coloured autumn foliage.
Description
[edit]Northern Empress attains a height of about 28 ft. and a spread of about 24 ft. after 35 years, being smaller in stature than the species type,[3] and develops a rounded open crown. The cultivar has medium green leaves colouring from apricot to rich burgundy before leaf-fall. The smooth grey-brown bark begins to fissure vertically with orange tinges after the first few years of growth.[1] Seed production is light.[2]
Pests and diseases
[edit]The cultivar has the level of resistance to Dutch elm disease characteristic of the species. Minimally affected by black leaf spot.[4]
Cultivation
[edit]The tree was recommended for cultivation in North Dakota,[5][6] though reportedly "production numbers were lower than planned" (2021).[2] Northern Empress is tolerant of high pH levels.[4] The species does not sucker from roots.[7]
Accessions
[edit]- NDSU Dale E. Herman Research Arboretum[1]
Nurseries
[edit]- North America
References
[edit]- ^ a b c Ulmus davidiana var. japonica 'Burgundy Glow' (Northern Empress® Japanese Elm): A New Fall Color Tree', by Todd P. West, Gregory Morgenson, Larry Chaput, and Dale E. Herman; Department of Plant Sciences, North Dakota State University HortScience 52(1):198–199. 2017
- ^ a b c d Tom Kalb, 'The Northern Empress™ Japanese Elm is the Empress of Autumn', NDSU Extension topics
- ^ T. P. West, 'Northern Empress® Japanese elm' actahort.org
- ^ a b ' Northern Empress® Japanese Elm:Ulmus davidiana var. japonica 'Burgundy Glow'; NDSU research Foundation
- ^ 'Elms for North Dakota' (F1893, Revised November 2023) by Joe Zeleznik, NDSU Extension Forester, Greg Morgenson, Former Research Specialist, NDSU Plant Sciences Department, Todd West, Professor, NDSU Plant Sciences Department
- ^ 'Elms: the Good, the Bad and the Ugly', Todd P. West, Ph.D., North Dakota State University Department of Plant Sciences, NDSU North Dakota Agricultural Experiment Station
- ^ Heybroek, Hans M. (1981). "The Japanese elm species and their value for the Dutch elm breeding program" (PDF). Proceedings of the Dutch Elm Disease Symposium and Workshop, October 5–9, Winnipeg, Manitoba: 78–90.