Ulmus davidiana var. japonica 'Burgundy Glow'

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Ulmus davidiana var. japonica 'Burgundy Glow'
Variety Ulmus davidiana var. japonica
Cultivar 'Burgundy Glow' = Northern Empress
OriginUS

The Japanese elm cultivar Ulmus davidianavar.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.

Contents

NDSU report it superior in cold-hardiness to the hybrid cultivar 'Frontier', which also has wine-coloured autumn foliage.

Description

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

The cultivar has the level of resistance to Dutch elm disease characteristic of the species. Minimally affected by black leaf spot. [4]

Cultivation

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

Nurseries

North America

References

  1. 1 2 3 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
  2. 1 2 3 4 Tom Kalb, 'The Northern Empress™ Japanese Elm is the Empress of Autumn', NDSU Extension topics
  3. ↑ T. P. West, 'Northern Empress® Japanese elm' actahort.org
  4. 1 2 ' Northern Empress® Japanese Elm:Ulmus davidiana var. japonica 'Burgundy Glow'; NDSU research Foundation
  5. ↑ '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
  6. ↑ '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
  7. ↑ 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.
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