Ulmus × hollandica 'Jacqueline Hillier'
|Ulmus × hollandica cultivar|
'Jacqueline Hillier', Arènes de Lutèce, Paris, 2007
|Hybrid parentage||U. glabra × U. minor var. plotii|
The 'dwarf' elm 'Jacqueline Hillier' ('JH') is believed to be a hybrid cultivar from the Elegantissima Group of Ulmus × hollandica, though uncertainty about its parentage has led some nurserymen to list it simply as Ulmus 'Jacqueline Hillier'. It was cloned from a specimen found in a private garden in Selly Park, Birmingham, England in 1966.
With time 'JH' makes a large shrub, then a small tree, initially of dense habit, but spreading with age if left unpruned. It bears small, double-toothed scabrid leaves 2.5 cm to 3.5 cm long on densely hairy twigs. In winter its tidy 'herringbone' branches and branchlets proclaim it an elm, despite its shrublike size. 'JH' does not produce flowers.
Pests and diseases
Resistance to Dutch elm disease is not known, but is probably academic as the tree is unlikely to attain the height at which it would attract the attention of the bark beetles that act as vectors of the disease. In trials in the United States, 'JH' was found to be virtually unaffected by the Elm Leaf Beetle Xanthogaleruca luteola .
'JH' is commonly found in cultivation in Europe and the United States, where it is considered particularly suitable for small gardens, rockeries, low hedges, and bonsai. A hardy tree, it is said to survive temperatures as low as - 25° F. ( - 32° C.) in North America. Despite its dwarf nature and its reputation as a slow-grower, 'JH' is said to grow 6 ft (2 m) by 6 ft in ten years  - faster than the dwarf wych elm 'Nana'.
The UK TROBI Champion grows at Talbot Manor in Norfolk, measuring 8 m high by 28 cm d.b.h. in 2008. Another at Exbury Gardens in Hampshire measured 6 m high by 35 cm d.b.h. in 2006  In keeping with the ancient tradition of planting funerary elms to commemorate the dead, specimens of 'Jacqueline Hillier' were planted on either side of the memorial to the dead in the Quintinshill rail disaster, Britain's worst rail disaster, in Rosebank Cemetery, Edinburgh.
- North America
- Chicago Botanic Garden, Glencoe, Illinois. 1 tree in Educational Center Gardens, listed as U. × hollandica 'Jacqueline Hillier'.
- Dawes Arboretum , Newark, Ohio. 3 trees, no acc. details available.
- Scott Arboretum. Acc. no. 93-518
- Arboretum de La Petite Loiterie , Monthodon, France. No details available
- Bradenham Hall Garden & Arboretum, Thetford, Norfolk, UK . One tree planted 1986.
- Brighton & Hove City Council, UK, NCCPG Elm Collection .
- Dubrava Arboretum, Lithuania. As U. × hollandica 'Jacqueline Hillier', no other details available.
- ELTE Botanic Garden, Budapest, Hungary. Acc. no. 19981834
- Granada Arboretum, Jodrell Bank, Cheshire, UK. UK Champion, 6 m high, 38 cm d.b.h. in 2004.
- Grange Farm Arboretum , Sutton St. James, Spalding, Lincs., UK. Acc. no. 835.
- Hortus Botanicus Nationalis, Salaspils, Latvia. Acc. nos. 18122,3,4,5 (as U. hollandica 'Jacqueline Hillier').
- Linnaean Gardens of Uppsala, Finland. Acc. no. 2008-0277
- Royal Botanic Gardens Kew. Acc. no. 1997-31
- Royal Horticultural Society Gardens, Wisley, UK. No details available
- Strona Arboretum, University of Life Sciences, Warsaw, Poland. As U. minor 'Jacqueline Hillier'.
- University of Copenhagen Botanic Garden, Denmark. Acc. no. P1982-5281
- University Parks, Oxford, UK. No details available
- University of Oxford Botanic Garden, UK. Acc. no. 1999115.2
- Westonbirt Arboretum , Tetbury, Glos., UK. (As U. minor 'Jacqueline Hillier'). Acc. nos 1987/762, 1993/187.
- North America
- Hilliers' Manual of Trees & Shrubs. Ed. 4, 399, (1977); David & Charles, Newton Abbot, UK
- Wyman, D. (1967). Arnoldia, 27(6): 61-66, 1967
- 'Gardeners Chronicle & New Horticulturist', 1968
- Photograph of 'JH' in the Netherlands
- Johnson, O. (2011). Champion Trees of Britain & Ireland, 169. Kew Publishing, Kew, London. ISBN 9781842464526.