 For 'specimen' urban elms, grafting to wych-elm root-stock may be used to eliminate suckering or to ensure stronger root-growth.The mutant-elm cultivars are usually grafted, the ‘weeping' elms 'Camperdown' and 'Horizontalis' at , the dwarf cultivars 'Nana' and 'Jacqueline Hillier' at ground level.Since the Siberian Elm is drought-tolerant, in dry countries new varieties of elm are often root-grafted on this species.