Ulmus 'Frontier'
The American hybrid cultivar Ulmus 'Frontier' is a U. S. National Arboretum introduction (NA 55393) derived from a crossing of the European Smooth-leafed, or Narrow-leafed, Elm Ulmus minor subsp. minor with the Chinese Elm Ulmus parvifolia in 1971. Released in 1990, the tree is a unique example of the hybridization of spring-flowering and autumn-flowering elms.
Read more about Ulmus 'Frontier': Description, Pests and Diseases, Cultivation, Accessions, Nurseries