The cultivar may be distinguished from other elms by the corky ridges which on mature trees occur only on the epicormic branches of the trunk. The bark of branches and twigs is otherwise smooth. On immature trees and suckers, the corky bark is more pronounced. Elwes and Henry state that the seed is rarely viable, Bancroft that it is always sterile. The tree suckers profusely from roots. In southern Britain, 'Major' is commonly found as a sucker, sometimes in mixed hedgerows with English Elm; large Dutch Elm sucker-populations have been found in south west Wales, Cornwall, and along the Channel coast. The suckers of Dutch Elm are sometimes confused with those of English Elm, which may explain the widespread and random occurrence of the former in hedgerows in southern Britain. 'Major' comes into leaf some three weeks later than English elm, and loses its leaves some three weeks earlier, and when young, its branching is straighter, stouter and more open. It is usually more vigorous than English elm. The larger, tapering leaves, predominantly corky bark, and bold herringbone outline of Dutch Elm suckers also help to distinguish them from those of English elm. Pests and diseases Ulmus × hollandica 'Major' is very susceptible to Dutch elm disease. Cultivation The ‘Dutch’ elm quickly became popular in eighteenth-century estate plantations in England, survivors today being naturalised relics of this planting fashion; but the tree was always rare in the Netherlands, where from the eighteenth century hollandse iep (Holland elm) meant the widely planted hybrid Ulmus × hollandica Belgica (Belgian Elm). Ley (1910) noted that 'Major' could be found scattered throughout the lowlands of England and Wales, often in the company of English Elm; but, unlike the latter, extended into mountain valleys in South Wales up to 1000 feet. ‘Dutch’ elm was also planted in urban parks, for example in the elm-groves of Kensington Palace Gardens, and, on account of its suckering habit and quick growth, was frequently planted as the elm component in mixed coastal shelter-belts on the south coast, in Cornwall, South Wales, the Isle of Man, and East Anglia. The tree was propagated and marketed in the UK by the Hillier & Sons nursery, Winchester, Hampshire from 1949, with 101 sold in the period 1962 to 1977, when production ceased with the advent of the more virulent form of Dutch elm disease. 'Major' was introduced to Ireland, where the largest