Ulmus 'Louis van Houtte' (Syn. Ulmus 'Vanhouttei') is believed to have been first cultivated in Ghent, Belgium circa 1863.Boom, B. K. (1959), Nederlandse Dendrologie 1: 158, 1959 It was first mentioned by Franz Deegen in 1886. Labelled U. Louis van Houtte, Kew specimen, 1885, from Simon-Louis frères, Metz It was once thought a cultivar of English Elm Ulmus minor 'Atinia', though this derivation has long been questioned; W. J. Bean called it "an elm of uncertain status".Bean, W. J. (1988) Trees and shrubs hardy in Great Britain, 8th edition, Murray, London, p. 655 Its dissimilarity from the type and its Belgian provenance make the 'Atinia' attribution unlikely. Fontaine (1968) considered it probably a form of U. × hollandica.

The cultivar is named for the Belgian horticulturist and plant collector Louis Benoit van Houtte, 1810–1876.

Description When young, the tree has leaves entirely yellow, a colour retained throughout summer. However, as the tree ages, the colouring may begin a gradual reversion to green. A mature specimen which retained its yellow colouration in the crown stood in Edinburgh's Royal Circus Gardens till the early 1990s.Colour photo in Angus & Patricia MacDonald, Above Edinburgh and South-East Scotland (Edinburgh, 1989), pp. 70–71 The vertically fissured bark of mature trees is unlike that of English elm, with its squarish scaly fissuring. 'Louis van Houtte' has smaller leaves than the not dissimilar Ulmus glabra 'Lutescens' (Golden Wych Elm).

Pests and diseases 'Louis van Houtte' is vulnerable to Dutch elm disease (DED). Two specimens planted at Kew Gardens in the Pagoda Vista succumbed very rapidly to the earlier strain of DED in 1931.

Cultivation Before Dutch elm disease the tree was commonly cultivated in northern Europe.Clouston, B.; Stansfield, K., eds. (1979). After the Elm. London: HeinemannWilkinson, G. (1978). Epitaph for the Elm. London: Hutchinson. The Späth nursery of Berlin marketed it in the late 19th century as U. campestris Louis van Houtte, under which name it was introduced to the Dominion Arboretum, Ottawa, Canada, in 1898, and to the Ryston Hall arboretum, Norfolk, UK, (planted 1913). In the UK the tree was supplied by Hillier & Sons Nursery of Winchester, Hampshire, as U. procera 'Vanhouttei' / 'Louis van Houtte'.Trees and Shrubs Catalogue, Hillier & Sons, 1958–1959, p.99 The tree appeared in the 1902 catalogue of the Bobbink and Atkins nursery, Rutherford, New Jersey, as Ulmus aurea Louis van Houtte, and in Kelsey's 1904 catalogue, New York, as U. 'Louis van Houtte'. It is less commonly cultivated in Australasia, where the golden wych elm Ulmus glabra 'Lutescens' has sometimes been mistakenly sold by nurseries under the name 'Louis van Houtte'.Spencer, R., Hawker, J. and Lumley, P. (1991). Elms in Australia. Australia: Royal Botanic Gardens, Melbourne. The description, "The finest of the golden elms, with a large leaf of a clear golden colour", in the 1918 catalogue of the Gembrook or Nobelius Nursery near Melbourne, suggests 'Lutescens' rather than 'Louis van Houtte'.Gembrook or Nobelius Nursery, Melbourne, 1916 catalogue Three trees in separate locations are known in the British Isles,In Brighton (see Accessions); in Kew's Wakehurst Place collection (hedge form); in the garden of Whitefoord House, Edinburgh (pollarded) (2017). as well as a partial avenue in Aberdeen (see 'Notable trees'). The tree is still occasionally cultivated in the Netherlands, a specimen being planted in 2018 in Anton Smeerdijkgaarde, Kortenhoef, as part of Wijdemeren City Council's elm collection. The cultivar remains in commerce at a nursery in the US.

Notable trees Several large trees survive in Sweden, including a specimen in Kristianstad and one, planted c.1890 (girth 3.7 m), in the Serafimerparken, Stockholm (2017).Photograph of 'Louis van Houtte' elm in Kristianstad, Sweden: www.tradgardsakademin.se - photo 7 ; photograph of Serafimerparken tree from tradgardsakademin.se'Louis van Houtte' from the air, left, Serafimerparken, Stockholm (2013) Until c.2020 Osborne Place, Aberdeen was lined mostly with 'Louis Van Houtte' planted in 1936.Application for commemorative plaque, Aberdeen City Council (2009) Losses in the avenue have been replaced by the more resistant golden elm 'Wredei'.

The largest known tree is an old specimen located in Christchurch Botanic Gardens, New Zealand.Photograph of 'Louis van Houtte' in Christchurch Botanic Gardens, wvendb.wordpress.com/page/3/ The tree, planted c.1860, has a bole girth of 5.6 m, a diameter of 179.9 cm, is 27.7 m high and has an average canopy spread of 31.1 m (2023).

Synonymy 'Ludwig van Houtte': Spath-Buch, 1720–1920, 229, 1921, in error. Ulmus montana lutescens van Houttei: Schelle in Beissner et al., Handbuch der Laubholz-Benennung 86. 1903, in error. Ulmus minor foliis flavescentibus: Miller, The Gardeners Dictionary ed. 2. 1735, Ulmus no. 8.

Accessions

North America None known.

Europe Brighton & Hove City Council, UK. NCCPG Elm Collection. UK champion: Carden Park, 21 m high, 61 cm d.b.h. (1996).Johnson, Owen (ed.) (2003). Champion Trees of Britain & Ireland. Whittet Press, . Grange Farm Arboretum, Lincolnshire, UK. Acc. no. 1134, as U. minor 'Louis van Houtte'. National Botanic Gardens (Ireland), Glasnevin, Dublin. Location A3 (156)

Australasia Royal Botanic Gardens Victoria (Melbourne), AustraliaRBGV (Melbourne) Elm list Christchurch Botanic Gardens, Christchurch, New Zealand. 1 tree, details not known. Eastwoodhill Arboretum , Gisborne, New Zealand. 2 trees, details not known. Manukau Cemetery, Papatoetoe, Auckland, New Zealand. 1 tree.

Nurseries Europe Centrum voor Botanische Verrijking vzw, Kampenhout, Belgium.Centrum voor Botanische Verrijking vzw: Voorraadlijst , accessdate: 2 November 2016 Noordplant Nurserys, Glimmen, Netherlands

North America Foothills Nursery, Mt. Airy, North Carolina, United States

Notes

References