Description
Unlike an earlier crossing of the same species 'Sapporo Autumn Gold', the tree 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 usually begins when the tree is aged 8 years.
The tree's growth is unusual; in an assessment at U C Davis as part of the National Elm Trial, its d.b.h. increased faster than any other of the 15 cultivars, but increase in height was one of the slowest, averaging a modest 0.9 m per annum.
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. More recently in the Netherlands, cuttings have been successfully grafted onto Belgian Elm Ulmus × hollandica 'Belgica' rootstocks in the hope of making the tree more adaptable to heavy, clayey soils.
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Leaf, with 1 Euro coin.
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'New Horizon', Chalons-sur-Saone.
Read more about this topic: Ulmus 'New Horizon'
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