Ulmus parvifolia 'Zettler'

Ulmus parvifolia 'Zettler' (selling name Heritage)^[1] is a Chinese Elm cultivar that is one of three^{[clarification needed]} recent^[timeframe?] (< 2006) American introductions selected for their cold hardiness (USA zone 4 tolerant).

Heritage has a strong, upright habit and excellent branching structure, bearing deep green glossy foliage that turns to an attractive autumn colour in some years.

The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the Elm Leaf Beetle Xanthogaleruca luteola.^[2]

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.

None known.

North America

• North American Plants [1], Lafayette, Oregon, US.

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