Ulmus 'Rebona'

Ulmus 'Rebona' is an American hybrid cultivar raised by the Wisconsin Alumni Research Foundation (WARF) as selection 'W916', derived from a crossing of Japanese Elm clone W43-8 = 'Reseda' with Siberian Elm clone W426 grown from seed collected from a street tree at Yankton, South Dakota.^[1] The tree was registered in 1993 by Conrad Appel KG, of Darmstadt (ceased trading 2006) and is a sibling of 'New Horizon' (selection 'W917'). In Europe, 'Rebona' is marketed as a Resista elm^[2] protected under E U breeders' rights (E U council decision 2100/94).

Ulmus 'Rebona'
'Rebona', Treskowstrasse, Heinersdorf, Berlin (2014)
Genus	Ulmus
Hybrid parentage	U. davidiana var. japonica × U. pumila
Cultivar	'Rebona'
Origin	US

Description

'Rebona' leaf

'Rebona' bears a close resemblance to its sibling 'New Horizon', but requires less maintenance owing to a better leader. The tree grows rapidly,^[3] developing a fastigiate pyramidal shape with ascending branches. The glossy leaves (6 to 9 cm long by 3 to 5 wide) are described by Resista Ulmen as "a little smaller and darker" than those of 'New Horizon'.^[3][4] The petiole is 10 to 15 mm long.^[5][6]

Pests and diseases

'Rebona' is highly resistant to Dutch elm disease, rated 5 out of 5.^[4]

Cultivation

'Rebona' has been widely planted as a street tree in Germany, the Netherlands, and to a lesser extent in France and the UK.^[7] The tree has never been offered for sale in the United States.

• 
  Lines of 'Rebona' in Purmerend city centre, the Netherlands (2015)^[8]
• 
  'Rebona' in spring, Treskowstrasse, Berlin-Heinersdorf (2012)
• 
  'Rebona' lining Utrechtsebaan, The Hague (September 2023)^[8]
• 
  'New Horizon' and 'Rebona' alternating in the Wilhelminaplein, Naaldwijk (2019)^[9][10]

Synonymy

• 'Rebone' ^[1]

Accessions

Europe

• Botanischer Garten Marburg, Marburg, Germany. No details available.
• Grange Farm Arboretum, Lincolnshire, UK. Acc. no. not known.
• Royal Botanic Gardens, Kew, UK. Acc. no. not known.
• Sir Harold Hillier Gardens, Romsey, UK. One tree planted Crookhill overflow parking area. Acc. no. 2018.0019

Nurseries

Europe

• Baumschule Grossbötzl Ort, Austria.
• Björkhaga Plantskola Veberöd, Sweden.
• Clasen & Co Rellingen, Germany.
• Eisele GmbH, Darmstadt, Germany.
• Hilliers Nurseries, Liss, UK.
• Noordplant, Glimmen, Netherlands.
• Boomkwekerij Ebben, Cuijk, Netherlands.
• Pépinières Rouy-Imbert Monfavet-Avignon, France.