| Ulmus hybrid | |
|---|---|
'Coolshade', Tenantry Down Road, Brighton. Photo: Ronnie Nijboer, Bonte Hoek kwekerijen |
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| 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.
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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]
Reputedly tolerant of Dutch elm disease, 'Coolshade' has not been tested by inoculation to determine the degree of resistance.
'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 (examples in Tenantry Down Road, Brighton).