''Ulmus'' × ''intermedia'' 'Coolshade'
| Ulmus × intermedia cultivar | |
|---|---|
 'Coolshade', Tenantry Down Road, Brighton, UK, in 2007. | |
| Hybrid parentage | U. rubra × U. pumila |
| Cultivar | 'Coolshade' |
| Origin | Sarcoxie, Missouri, USA |
The hybrid elm cultivar Ulmus × intermedia 'Coolshade' is an American hybrid cultivar cloned from a crossing of the Slippery, or Red, Elm Ulmus rubra (female parent) and the Siberian Elm Ulmus pumila at the Sarcoxie Nurseries, Sarcoxie, Missouri, in 1946.
Description
'Coolshade' has rapid, stocky growth with a compact crown resistant to breakage under ice and snow; its foliage a very dark green.[1][2]
Pests and diseases
Reputedly tolerant of Dutch elm disease, 'Coolshade' has not been tested by inoculation to determine the degree of resistance.
Cultivation
'Coolshade' was raised to create a disease-resistant tree that would not suffer the storm damage frequently sustained by the weak-wooded U. pumila. The tree was introduced to the UK in the 1960s.
Notable trees
The UK TROBI Champion grows at Ryecroft, Whitehawk Road, Brighton; planted in 1964, it measured 20 m high by 78 cm d.b.h. in 2009. [3]
Cultivars
Accessions
North America
- Arnold Arboretum. Acc. no. 561–48
Europe
- Brighton & Hove City Council, UK, NCCPG Elm Collection.[4]
References
- ↑ Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. Arnold Arboretum, Harvard University. 24 (6–8): 41–80. Retrieved 16 February 2017.
- ↑ Bean, W. J. (1981). Trees and shrubs hardy in Great Britain, 7th edition. Murray, London.
- ↑ Johnson, O. (2011). Champion Trees of Britain & Ireland, p. 168. Kew Publishing, Kew, London. ISBN 9781842464526.
- ↑ "List of plants in the {elm} collection". Brighton & Hove City Council. Retrieved 23 September 2016.
External links
- "Herbarium specimen - L.1582543". Botany catalogues. Naturalis Biodiversity Center. Sheet labelled U. pumila L. 'Coolshade' (Arnold Arboretum specimen, 1960)