The hybrid elm cultivar Ulmus × intermedia 'Improved Coolshade' is a superior selection from 'Coolshade' (U. rubra × U. pumila) and was patented and released by the Sarcoxie Nurseries, Sarcoxie, Missouri, United States, in 1958.
| Ulmus × intermedia 'Improved Coolshade' | |
|---|---|
| Hybrid parentage | U. rubra × U. pumila |
| Cultivar | 'Improved Coolshade' |
| Origin | Sarcoxie, Missouri, US |
Description edit
The tree is similar to 'Coolshade', but faster growing.
Pests and diseases edit
Although reputedly resistant to Dutch elm disease, it had not been (by 1995) widely tested.[1]
Cultivation edit
'Improved Coolshade' was noted for its drought tolerance. It is not known whether the tree remains in cultivation in North America, nor whether it was introduced to Europe or Australasia.
Synonymy edit
- 'Primus' (earlier name for the cultivar).
References edit
- ^ Santamour, Frank S.; Bentz, Susan E. (May 1995). "Updated Checklist of Elm (Ulmus) Cultivars for use in North America". Journal of Arboriculture. 21 (3): 122–131. Retrieved 20 June 2016.
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