The

hybrid Hybrid may refer to: Science * Hybrid (biology), an offspring resulting from cross-breeding ** Hybrid grape, grape varieties produced by cross-breeding two ''Vitis'' species ** Hybridity, the property of a hybrid plant which is a union of two dif ...

elm

cultivar A cultivar is a type of cultivated plant that people have selected for desired traits and when propagated retain those traits. Methods used to propagate cultivars include: division, root and stem cuttings, offsets, grafting, tissue culture, ...

''Ulmus'' 'Den Haag' is a Dutch development derived from a chance crossing of the Siberian Elm cultivar ''Ulmus pumila'' 'Pinnato-ramosa' and the Belgian Elm ''Ulmus × hollandica'' 'Belgica'. S. G. A. Doorenbos (1891-1980), Director of Public Parks in

The Hague The Hague ( ; nl, Den Haag or ) is a city and municipality of the Netherlands, situated on the west coast facing the North Sea. The Hague is the country's administrative centre and its seat of government, and while the official capital of ...

, finding that seeds he had sown in 1936 from the Zuiderpark 'Pinnato-ramosa' had hybridized with the local 'Belgica', selected six for trials. The best was cloned and grafted on 'Belgica' rootstock as 'Den Haag'; it was planted first in that city, then released to nurseries elsewhere in the Netherlands. The other five were also planted in The Hague.

Description

The tree is distinguished by its pendulous branches, and its foliage, which is light-green on emergence but turning lime-green and ultimately deep green by midsummer. The leaves are typical of ''U. pumila'' × ''Ulmus × hollandica'', being very unequal at the base. The seed is central in the

samara Samara ( rus, Сама́ра, p=sɐˈmarə), known from 1935 to 1991 as Kuybyshev (; ), is the largest city and administrative centre of Samara Oblast. The city is located at the confluence of the Volga and the Samara (Volga), Samara rivers, with ...

(see 'External links'). File:SHHG Ulmus 'Den Haag' leaf.jpg, 'Den Haag' leaf File:Den Haag foliage 2.jpg, 'Den Haag' long shoots

Pests and diseases

Although reputed to be slightly resistant to

Dutch elm disease Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by elm bark beetles. Although believed to be originally native to Asia, the disease was accidentally introduced into Americas, America ...

, drought, and frost, the tree has brittle branches, and is vulnerable to Coral-spot Fungus '' Nectria cinnabarina'' Heybroek, H. M. (1986). ''Tuin en Landschap'', 8(12): 19, 1986

Etymology

The tree is named for the city of

Den Haag The Hague ( ; nl, Den Haag or ) is a city and municipality of the Netherlands, situated on the west coast facing the North Sea. The Hague is the country's administrative centre and its seat of government, and while the official capital of ...

(known as The Hague in English). An unnamed cultivar of the same parentage stood in Zuiderpark, The Hague, in the mid-20th century.''U. pumila'' var. ''arborea'' × ''Ulmus × hollandica'' 'Belgica' bioportal.naturalis.nl, specimen, L.1587051, samarae
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Cultivation

The tree remains in commerce in the Netherlands (on its own rootstock) and New Zealand. 'Den Haag' is not known to have been introduced to North America. File:Den Haag at Southsea.jpg, 'Den Haag' at Southsea, Hampshire, UK (2007) File:SHHG Ulmus 'Den Haag'.jpg, 'Den Haag', Sir Harold Hillier Gardens, UK (2015) File:cathedral - regal - pioneer - urban - laevis - den haag.jpg, Elm cultivars, The Netherlands; 'Den Haag' far right of picture (2014)

Notable trees

The UK TROBI Champion grows at Preston Park in Brighton, measuring 14 m high by 77 cm

d.b.h. Diameter at breast height, or DBH, is a standard method of expressing the diameter of the trunk or bole of a standing tree. DBH is one of the most common dendrometric measurements. Tree trunks are measured at the height of an adult's breast, ...

in 2009. Johnson, O. (2011). ''Champion Trees of Britain & Ireland'', p. 168. Kew Publishing, Kew, London. .

Synonymy

*''Ulmus'' 'Ieplaan': old (original?) name for ''Ulmus'' 'Den Haag'. *''Ulmus pumila'' 'Den Haag': various authorities.

Accessions

;Europe *

Brighton & Hove Brighton and Hove () is a city and unitary authority in East Sussex, England. It consists primarily of the settlements of Brighton and Hove, alongside neighbouring villages. Often referred to synonymously as Brighton, the City of Brighton and H ...

City Council, UK,

NCCPG Plant Heritage, formerly known as the National Council for the Conservation of Plants and Gardens (NCCPG), is a botanical conservation organisation in the United Kingdom and a registered charity. It was founded in 1978 to combine the talents of b ...

Elm Collection. Large tree in Preston Park. *

Grange Farm Arboretum The Grange Farm Arboretum is a small private arboretum comprising 3 hectares accommodating over 800 trees, mostly native and ornamental species or cultivars, notably oaks, ashes, walnuts and elms, growing on a calcareous loam.Ostler, J. (2009) ' ...

Sutton St James Sutton St James is a village and civil parish in the South Holland district of Lincolnshire, England, about south-west of Long Sutton. Lying in the Lincolnshire Fens, Sutton St James did not exist at the time of the 1086 ''Domesday Book''. Su ...

, Spalding, Lincs., UK. Acc. no. 819. *

Sir Harold Hillier Gardens The Sir Harold Hillier Gardens is an arboretum comprising 72 hectares (180 acres) accommodating over 42,000 trees and shrubs in about 12,000 taxa, notably a collection of oaks, camellia, magnolia and rhododendron. The Gardens are located nor ...

Romsey Romsey ( ) is a historic market town in the county of Hampshire, England. Romsey was home to the 17th-century philosopher and economist William Petty and the 19th-century British prime minister, Lord Palmerston, whose statue has stood in the t ...

Hampshire Hampshire (, ; abbreviated to Hants) is a ceremonial county, ceremonial and non-metropolitan county, non-metropolitan counties of England, county in western South East England on the coast of the English Channel. Home to two major English citi ...

, UK. Acc. no. 2008.0114

Nurseries

;Europe *De Reeboc

Zwalm Zwalm () is a municipality located in Flanders, in the Flemish province of East Flanders, in Belgium. The municipality comprises the villages of Beerlegem Beerlegem is a village belonging to the municipality of Zwalm. It is located in the Flemi ...

, Belgium. *Noordplan

Glimmen Glimmen is a village in the northeastern Netherlands. It is located in the municipality of Groningen, about 10 kilometres from the city. It had a population of around 1,342 in 2021. The river Drentsche Aa flows past the village, nearby the ''Huis ...

, Netherlands. *Van Den Berk (UK) Ltd.

London, UK ;Australasia *Big Tree

Nelson, New Zealand, Nelson, New Zealand.

References

External links

* Sheet labelled ''U. pumila'' var. ''arborea'' × ''Ulmus × hollandica'' 'Belgica'; leaves specimen, Zuiderpark, The Hague (1962) * Sheet labelled ''U. pumila'' var. ''arborea'' × ''Ulmus × hollandica'' 'Belgica'; samarae specimen 1, Zuiderpark, The Hague * Sheet labelled ''U. pumila'' var. ''arborea'' × ''Ulmus × hollandica'' 'Belgica'; samarae specimen 2, Zuiderpark, The Hague {{Elm species, varieties, hybrids, hybrid cultivars and species cultivars , state=collapsed Hybrid elm cultivar Ulmus articles with images Ulmus