Ulmus 'Coolshade'

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Ulmus hybrid cultivar
RN Ulmus Coolshade, Brighton.JPG
'Coolshade', Tenantry Down Road, Brighton, UK, in 2007.
Hybrid parentage U. rubra × U. pumila
Cultivar 'Coolshade'
Origin Sarcoxie, Missouri, USA

Ulmus '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[edit]

RN Ulmus Coolshade leaves.JPG

'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[edit]

Reputedly tolerant of Dutch elm disease, 'Coolshade' has not been tested by inoculation to determine the degree of resistance.

Cultivation[edit]

'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[edit]

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[edit]

Accessions[edit]

North America[edit]

Europe[edit]

References[edit]

  1. ^ Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. Arnold Arboretum, Harvard University. 24 (6–8): 41–80. Retrieved 16 February 2017. 
  2. ^ Bean, W. J. (1981). Trees and shrubs hardy in Great Britain, 7th edition. Murray, London.
  3. ^ Johnson, O. (2011). Champion Trees of Britain & Ireland, p. 168. Kew Publishing, Kew, London. ISBN 9781842464526.
  4. ^ "List of plants in the {elm} collection". Brighton & Hove City Council. Retrieved 23 September 2016.