The Camperown Elm Ulmus glabra 'Camperdownii' is a cultivar which cannot reproduce from seed. The grafted Camperdown Elm slowly develops a broad, flat head that may eventually build as high as 4 m (13 feet) and an incommensurately wide crown with a contorted, weeping habit . This cultivar requires a large open space in order to develop fully, and so is not recommended for small home grounds. The tree is often confused with the much taller 'Horizontalis' (Weeping Wych Elm) owing to both being given the epithet 'Pendula' at some stage .