Ulmus 'New Horizon'

Ulmus hybrid
'New Horizon', Wisconsin-Madison University
Hybrid parentage	U. davidiana var. japonica × Ulmus pumila
Cultivar	'New Horizon'
Origin	WARF, Wisconsin, USA

Ulmus 'New Horizon' is an American hybrid cultivar raised by the Wisconsin Alumni Research Foundation (WARF), from a crossing of the Japanese Elm clone W43-8 = 'Reseda' (female parent) with Siberian Elm clone W426 grown from seed collected from a street tree at Yankton, South Dakota. 'New Horizon' was patented in the USA in 1994, while in Europe, it is one of the 'Resista' elms [7] protected under E U breeders' rights (E U council decision 2100/94).

Unlike its elder stablemate 'Sapporo Autumn Gold', 'New Horizon' initially has a compact, pyramidal form, with comparatively dense foliage comprising glabrous, dark-green, elliptical leaves < 12 cm long by 7 cm broad, occasionally without the asymmetric bases typical of the genus. The perfect, apetalous wind-pollinated flowers appear in March, followed by the seeds in April; flowering, and consequent fruiting, is sparse, in common with its female parent Japanese Elm, and usually begins when the tree is aged 8 years.

The tree's growth habit is unusual; in an assessment at U C Davis as part of the National Elm Trial, its stem diameter increased faster than any other of the 15 cultivars, but increase in height, averaging 0.9 m per annum, made it one of the slowest growing, vertically.

In commerce in the USA, the tree is occasionally propagated by grafting onto an Ulmus pumila rootstock, rather than simply rooting cuttings as normally practiced in North America and Europe.

Leaf, with 1 Euro coin

'New Horizon', Chalons-sur-Saône