Pseudotsuga Menziesii

The Chinese Elm cultivar Ulmus parvifolia 'Cork Bark' or 'Corticosa is a North American clone.

Description

By 8 to 10 years old, the bark breaks into thick, rough, irregular dark grey scales with deep fissures, the scales being present also on branches. Leaves are around 4 cm long, light green in spring, middle green in summer, turning bright yellow in fall. Tree grows some 20 ft tall and correspondingly wide. Described by Dawes Arboretum as "a fast-growing, tough tree".^[1]

Pests and diseases

The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the Elm Leaf Beetle Xanthogaleruca luteola.^[2] 'Cork Bark' is susceptible to elm yellows.^[1]

Cultivation

The tree is sometimes chosen for bonsai, on account of its bark.

Synonymy

• Ulmus parvifolia Jacq. corticosa^[1]

Accessions

North America

• Dawes Arboretum [1], Newark, Ohio; US. 2 trees, as 'Corkbark'. D2004-0238.001 & 002.
• Niagara Parks Botanical Gardens [2], Canada. Acc. no. 990142

References