The Japanese Elm cultivar Ulmus davidiana var. japonica 'Validation' is a selection made by Kunso Kim and Bethany Brown of the Morton Arboretum released in 2011; propagation is by grafting onto Siberian Elm Ulmus pumila rootstocks.Morton Arboretum plant database, 2015.
Description 'Validation' is a vase-shaped tree, the trunk bark smooth and gray. The current year's twigs are light green, contrasting with the previous year's, which are greenish brown.
Pests and diseases Not known.
Cultivation The tree is very rare in cultivation beyond the Morton Arboretum.
Accessions North America Morton Arboretum, Illinois, US. Acc. No. 22-2008, one plant. Europe Grange Farm Arboretum, Lincolnshire, UK. Acc. no. 1126.
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