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".Ulmus parvifolia 'Cork Bark', The Dawes Arboretum; dawesarb.arboretumexplorer.org
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. 'Cork Bark' is susceptible to elm yellows.
Cultivation The tree is sometimes chosen for bonsai, on account of its bark.
Synonymy Ulmus parvifolia Jacq. corticosa
Accessions North America Dawes Arboretum , Newark, Ohio; US. 2 trees, as 'Corkbark'. D2004-0238.001 & 002. Niagara Parks Botanical Gardens , Canada. Acc. no. 990142
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