[3] Tested in the US National Elm Trial coordinated by Colorado State University, [4] 'Patriot' averaged a survival rate of 85% after 10 years.

[3] [5] 'Patriot' was found to have a very high resistance to Dutch elm disease (DED) in the United States, exhibiting 100% survival seven years after inoculation with the causal pathogen.

[6] The tree performs best in moist but well-drained soils, but will tolerate alkaline ground and salts [7].

[7] 'Patriot' is extremely cold hardy; in artificial freezing tests at the Morton Arboretum [8] the LT50 (temp.

'Patriot' was introduced to the Netherlands and the UK in 2008,[9] and to Italy in 2011 by the Istituto per la Protezione delle Piante, Florence.