| Ulmus parvifolia 'Zettler' | |
|---|---|
| Species | Ulmus parvifolia |
| Cultivar | 'Zettler' = Heritage |
| Origin | US |
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'.
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]
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]
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]
None known.
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