The field elm cultivar Ulmus minor 'Ademuz' was cloned by root cuttings from a tree assumed to be growing in or near the eponymous town 100 km north-west of Valencia,[1] Spain.

'Ademuz' is one of a number of U. minor clones found to have a very high resistance to Dutch Elm Disease, on a par with, if not greater than, the hybrid cultivar 'Sapporo Autumn Gold' grown as a control.

'Ademuz' was introduced to the UK in 2014, by Hampshire & Isle of Wight Branch, Butterfly Conservation, as part of an assessment of DED-resistant cultivars as potential hosts of the endangered White-letter Hairstreak.

Specimens grown in southern England attained sexual maturity aged eight years, commencing flowering in late February (week 8).

[3] In inoculation trials conducted in 2008, 'Ademuz' sustained approximately 10% damage (assumed to be wilting rather than die-back) against a score of c. 45% for the benchmark-resistant cultivar 'Sapporo Autumn Gold'.

https://es.climate-data.org/ 'Ademuz' has been widely planted in England since 2014, notably thriving at four sites in Hampshire, as part of Butterfly Conservation's elm trials, where the rainfall is approximately double the Valencia total, and geology ranges from chalk to impermeable clays.