Chinese Hemlock Tsuga chinensis - Arnoldia

<strong>Tsuga</strong> <strong>chinensis</strong> 67Peter Del TrediciPaul MeyerSlightly drooping branch habit on a young <strong>Chinese</strong> hemlock.“droopier” during the growing season, seemsto be comparably shade tolerant (althoughthis trait has not actually been quantified), isless cold hardy—Zone 5 versus Zone 3 (averageannual minimum temperature -30 to -40°F[-34.4 to -40°C])—and, as mentioned, has thegreat advantage of adelgid resistance. It is a terrificplant for replacing adelgid-killed easternhemlocks under cultivated conditions.ReferencesDel Tredici, P. and A. Kitajima. 2004. Introductionand cultivation of <strong>Chinese</strong> hemlock (<strong>Tsuga</strong><strong>chinensis</strong>) and its resistance to hemlockAttractive foliage of <strong>Chinese</strong> hemlock.woolly adelgid (Adelges tsugae). Journal ofArboriculture 30(5): 282–287.Bentz, S. E., L. G. H. Riedel, M. R. Pooler, and A. M.Townsend. 2002. Hybridization and selfcompatibilityin controlled pollinations ofeastern North American and Asian hemlock(<strong>Tsuga</strong>) species. Journal of Arboriculture 28(4):200–205.Hooper, B. K., R. M. Bates, J. C. Sellmer, and G. A.Hoover. 2009. Challenging <strong>Chinese</strong> hemlock(<strong>Tsuga</strong> <strong>chinensis</strong>) with hemlock woolly adelgid(Adelges tsugae) ovisacs. Arboriculture andUrban Forestry 35(1): 1–4.Peter Del Tredici is a Senior Research Scientist at theArnold Arboretum.