Ulmus 'Coolshade'

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Ulmus hybrid
Hybrid parentage
U. rubra × U. pumila
Cultivar
'Coolshade'
Origin
Sarcoxie, Missouri, USA

The American hybrid cultivar 'Coolshade' was cloned from a crossing of the Slippery Elm or Red Elm, Ulmus rubra and the Siberian Elm Ulmus pumila at the Sarcoxie Nurseries, Sarcoxie, Missouri, in 1946. Described as a being of rapid, stocky growth with a compact crown resistant to breakage under ice and snow, its foliage a very dark green ^[1] ^[2]. It was raised to create a disease-resistant tree that would not suffer the storm damage frequently sustained by the weak-wooded U. pumila. A superior, faster-growing selection named 'Improved Coolshade' was patented and released by the Sarcoxie Nurseries in 1958 and was noted for its drought tolerance, but it had not been (by 1995) widely tested for resistance to Dutch elm disease ^[3].

1 Arboreta etc. accessions
- 1.1 North America
- 1.2 Europe
2 References

[edit] Arboreta etc. accessions

[edit] North America

Arnold Arboretum acc. no. 561-48

[edit] Europe

Brighton & Hove City Council, UK, NCCPG Elm Collection [2] (two examples, at Ryecroft and Tenantry Down Road, Brighton).

[edit] References

^ Green, P. S. (1964). Registration of cultivar names in Ulmus. Arnoldia, Vol. 24. Arnold Arboretum, Harvard University. [1]
^ Bean, W. J. (1981). Trees and shrubs hardy in Great Britain, 7th edition. Murray, London.
^ Santamour, F. S., & Bentz, S. E. Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture, 21(3): May, 1995.