Tags: Cultivar (Cultivated Variety).
The Field Elm Ulmus minor cultivar ‘Retiro’ was cloned from a tree found growing in Madrid by researchers at the Escuela Técnica Superior de Ingenieros de Montes Universidad Politėcnica de Madrid. The tree is one of seven discovered to have a very high resistance to Dutch Elm Disease on a par with if not greater than Sapporo Autumn Gold. In the Madrid study the appearance of the tree was rated 4 / 5.