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Coolshade (elm hybrid)
Encyclopedia
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.
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.
, 'Coolshade' has not been tested by inoculation to determine the degree of resistance.
Cultivar
A cultivar'Cultivar has two meanings as explained under Formal definition. When used in reference to a taxon, the word does not apply to an individual plant but to all those plants sharing the unique characteristics that define the cultivar. is a plant or group of plants selected for desirable...
Ulmus 'Coolshade' was cloned from a crossing of the Slippery, or Red, Elm Ulmus rubra
Ulmus rubra
Ulmus rubra, the Slippery Elm, is a species of elm native to eastern North America...
and the Siberian Elm Ulmus pumila at the Sarcoxie Nurseries, Sarcoxie, Missouri
Missouri
Missouri is a US state located in the Midwestern United States, bordered by Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas and Nebraska. With a 2010 population of 5,988,927, Missouri is the 18th most populous state in the nation and the fifth most populous in the Midwest. It...
, in 1946.
Description
Pests and diseases
Reputedly tolerant of Dutch elm diseaseDutch elm disease
Dutch elm disease is a disease caused by a member of the sac fungi category, affecting elm trees which is spread by the elm bark beetle. Although believed to be originally native to Asia, the disease has been accidentally introduced into America and Europe, where it has devastated native...
, '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 (examples in Tenantry Down Road, Brighton).Europe
- Brighton & HoveBrighton & HoveBrighton and Hove is a unitary authority area and city on the south coast of England. It is England's most populous seaside resort.In 1997 Brighton and Hove were joined to form the unitary authority of Brighton and Hove, which was granted city status by Queen Elizabeth II as part of the millennium...
City Council, UK, NCCPG Elm Collection http://www.brighton-hove.gov.uk/index.cfm?request=c1108042 (two examples, at Ryecroft and Tenantry Down Road, Brighton).