Ulmus parvifolia 'Zettler' (selling name Heritage)[1] is a Chinese Elm cultivar cloned by Earl Cully from a tree growing near Jacksonville, Illinois, and patented in 1999.[2] It is one of a small number of American lacebark elm introductions selected for their cold hardiness (USA zone 4 tolerant), others including 'King's Choice', 'Hallelujah', 'Glory' and 'Matthew'.

Description

Heritage has a strong, upright "medium oval" habit and excellent branching structure, bearing deep green glossy foliage that turns to an attractive autumn colour in some years.[2] The tree attains a height and width of 50 ft by 50 ft.[3]

Pests and diseases

The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the Elm Leaf Beetle Xanthogaleruca luteola.[4]

Cultivation

Heritage was selected from over 20,000 seedlings in 1975, and subsequently proved to be one of the hardiest Chinese or Lacebark Elms available in the United States, surviving −33 °C (−27 °F) in Illinois during the winter of 1989 without sustaining any damage whatsoever. Heritage is not known to have been introduced to Europe or Australasia.[2]

Accessions

None known.

Nurseries

North America

References

  1. ^ "Elms". Archived from the original on 2006-11-14. Retrieved 2007-02-01.
  2. ^ a b c Lacebark elm tree named 'Zettler', US Patents, USPP10846P
  3. ^ Photographs and description of U. parvifolia 'Zettler', plants.beechwood-gardens.com
  4. ^ "Elm Leaf Beetle Survey". Archived from the original on 2011-07-19. Retrieved 17 July 2017.


Allikas: https://en.wikipedia.org/wiki/Ulmus_parvifolia_%27Zettler%27
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