Definitions

Ulmus parvifolia

Ulmus parvifolia

Ulmus parvifolia Jacq., commonly known as the Chinese or Lacebark, Elm, is a species native to China, Japan, North Korea and Vietnam.
Description

A small to medium-sized deciduous, semi-deciduous (rarely semi-evergreen) tree growing to 10-18 m tall with a slender trunk and crown, and has been described as "one of the most splendid elms, having the poise of a graceful Nothofagus". . The leathery, lustrous green single-toothed leaves are small, 2-5 cm long by 1-3 cm broad, and often retained as late as December or even January in Europe and North America. The flowers are produced in early autumn, small and inconspicuous, with the seed maturing rapidly and dispersing by late autumn. The trunk has a handsome, flaking bark of mottled greys with tans and reds, giving rise to its other common name, the Lacebark Elm, although scarring from major branch loss can lead to large canker-like wounds.

Pests and diseases
The Chinese Elm is highly resistant, but not immune, to Dutch elm disease. It is also very resistant to insect attack, and was adjudged as having the best pest resistance of about 200 taxa evaluated in elm trials at the Sunshine Nursery, Oklahoma.
Cultivation
The tree is arguably the most ubiquitous of the elms, now found in all the continents except Antarctica. It was introduced to Europe at the end of the 18th century as an ornamental, and is found in many botanical gardens and arboreta. In the United States, it appeared in the middle of the 19th century, and has proved very popular in recent years as a replacement for American Elms killed by Dutch elm disease. U. parvifolia is one of the cold-hardiest of the Chinese species. In artificial freezing tests at the Morton Arboretum. the LT50 (temp. at which 50% of tissues die) was found to be - 34 °C.
Uses
The Chinese Elm is a tough landscape tree, hardy enough for use in harsh planting situations such as parking lots, in small planters along streets and in plazas or patios. In New Zealand, it was found to be particularly suitable for windswept locations along the coast. Chinese Elms are frequently used in bonsai; they are considered a good choice for beginners owing to their high tolerance of pruning.
Invasive species
The tree can become invasive, notably in southern Africa, and is known as one of the 'Nasty Nine' in Namibia, where it was planted as a street tree in Windhoek. The Chinese Elm has also shown invasive species tendencies in some gardens in North America.
Subspecies & varieties

Forms

Cultivars
Numerous cultivars have been raised, mostly in North America:

Hybrid cultivars
An autumn flowering species, whereas most other elms flower in spring, hybrids have accordingly been very few:

Also U. '240' (U. minor var. minor × U. parvifolia) raised at Wageningen but never commercially released; a few specimens survive as part of the Brighton & Hove CC NCCPG Elm Collection at Stanmer Park, planted in 1965.

Accessions

North America

Nurseries

Widely available in North America, Europe, and Australasia.

Images

External links

  • http://bonsaisuperstore.storesecured.com/chinese-elm-care.asp

The Chinese Elm is a great bonsai for the beginner bonsai enthusiast.

  • http://fletcher.ces.state.nc.us/programs/nursery/metria/metria11/warren/elm.htm

The Status of Elms in the Nursery Industry in 2000, by Warren, K., and Schmidt, J. Frank & Son Co. (2002).

References

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