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Ulmus 'Pioneer'

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Title: Ulmus 'Pioneer'  
Author: World Heritage Encyclopedia
Language: English
Subject: Ulmus × hollandica, List of Elm species, varieties, cultivars and hybrids, National Elm Trial
Publisher: World Heritage Encyclopedia

Ulmus 'Pioneer'

Ulmus × hollandica
Hybrid parentage U. glabra × U. minor
Cultivar 'Pioneer'
Origin USA

The elm hybrid cultivar Ulmus × hollandica 'Pioneer' is an American clone arising from the crossing of two European species, Wych Elm U. glabra and Smooth-leaved Elm U. minor subsp. minor. Raised by the USDA station at Delaware, Ohio, in 1971, 'Pioneer' was released to commerce in 1983.


'Pioneer' is a fast-growing tree distinguished by a dense, globular crown, which as it matures becomes more broad than tall, like its U. glabra parent,[1] and casting a heavy shade. The leaves are deep green, and similar in shape to the Wych Elm,[2] colouring yellow and red in the fall.[3] The perfect, apetalous wind-pollinated flowers appear in early March.

Pests and diseases

The tree's resistance to

The tree's foliage was adjudged "resistant" to [4].


Considered "quite hardy in Saint Paul", and "definitely a good selection for the Twin Cities (St. Paul and Minnesota) urban forest" although very different in appearance to the American Elm.[7] 'Pioneer' has had a very limited introduction to Europe,[8] featuring in street tree trials in several Dutch cities in the late 1990s.


North America



North America

  • Bailey Nurseries Minnesota
  • ForestFarm Oregon
  • J. Frank Schmidt & Son Co. Oregon
  • Johnson's Nursery Wisconsin
  • Pea Ridge Forest Missouri
  • Sun Valley Garden Centre Minnesota


  • Westerveld Boomkwekerij B.V.Netherlands


External links

  • Summary, inc. photographs, of elm cultivars resistant to Dutch elm disease available in the USA.
  • Warren, K., J. Frank Schmidt & Son Co. (2002). The Status of Elms in the Nursery Industry in 2000.
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