Ulmus is a genus of deciduous, semi-decisuous or semi-evergreen trees in family Ulmaceae, comprising 30-40 species. It is commonly known as Elm. Eight species are endemic to North America, a few numbers in Europe, and the greatest diversity is found in China.
Elms are hermaphroditic (have both the male and female reproductive organs), have glossy green leaves and flowers which are apetalous (lack or reduced numbers of petals). The flowers are wind-pollinated and bear fruits which are round, wind-dispersed samara.
Ulmus 'Sapporo Autumn Gold' is a fast growing elm tree which has high resistance to Dutch elm disease (a fungal disease spread by elm bark beetle) and Verticillium ( a genus of fungi) wilt. It has leaves with tinged red in spring which turn yellow-green in autumn.
Ulmus parvifolia, which is commonly known as Chinese or Lacebark Elm, has small, glossy green leaves which persist well into late autumn or into early winter. It bears small flowers which open in early autumn and are followed by winged-fruit. Ulmus parvifolia is native to China, Japan, North Korea and Vietnam. It can grow to 10-18m tall with a slender trunk and crown.
Elms grow well in sun or partial shade, and well-drained soil. Propagation is by greenwood cuttings in summer. Diseases known to attack elms are Dutch elm disease and honey fungus.