Ulmus davidiana var. japonica 'Validation'

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.

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.