Ulmus 'Coolshade'

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Ulmus hybrid

'Coolshade', Tenantry Down Road, Brighton. Photo: Ronnie Nijboer, Noordplant
Details
Hybrid parentage U. rubra × U. pumila
Cultivar 'Coolshade'
Origin Sarcoxie, Missouri, USA

The American hybrid cultivar Ulmus 'Coolshade' was cloned from a crossing of the Slippery, or Red, Elm Ulmus rubra 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

Europe

  • Brighton & Hove City Council, UK, NCCPG Elm Collection .

References

  1. ↑ Green, P. S. (1964). Registration of cultivar names in Ulmus. Arnoldia, Vol. 24. Arnold Arboretum, Harvard University.
  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.
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