Patriot (elm cultivar)

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The American hybrid cultivar Patriot [1] is a U. S. Department of Agriculture introduction derived in 1980 from a crossing of the American hybrid Urban with the Wilson's Elm (now treated as Japanese Elm U. davidiana var. japonica) cultivar Prospector. It develops an upsweeping crown, ultimately becoming a fastigiate vase-shape, and is capable of very rapid growth, the parent tree in Ohio attaining a height of 13 m in as many years after it was sown. The foliage is dark green, turning yellow in autumn.

Patriot appears immune to elm yellows and also has a very high resistance to Dutch elm disease, but only a moderate tolerance of elm leaf beetles. It is cold hardy, and performs best in moist but well-drained soils. In trials in the hot and arid climate of eastern Arizona [2], it did not perform as well as some other American hybrids such as Frontier and Regal, but not as badly as others such as New Horizon and Sapporo Autumn Gold.

Patriot is not known to be in cultivation in Europe or Australasia.

[edit] References

Santamour, J., Frank, S. & Bentz, S. (1995). Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture, 21:3 (May 1995), 121-131. International Society of Arboriculture, Champaign, Illinois, USA.