The

hybrid Hybrid may refer to: Science * Hybrid (biology), an offspring resulting from cross-breeding ** Hybrid grape, grape varieties produced by cross-breeding two ''Vitis'' species ** Hybridity, the property of a hybrid plant which is a union of two dif ...

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 Sarcoxie is a city in Jasper County, Missouri, United States. The population was 1,406 at the 2020 census. It is part of the Joplin, Missouri Metropolitan Statistical Area. History Sarcoxie was platted in the early 1830s, and it was originally ...

, Missouri, United States, in 1958.

Description

The tree is similar to 'Coolshade', but faster growing.

Pests and diseases

Although reputedly resistant to Dutch elm disease, it had not been (by 1995) widely tested.

Cultivation

'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

*'Primus' (earlier name for the cultivar).

References

Ulmus × intermedia cultivar Ulmus articles missing images Ulmus {{Ulmaceae-stub