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Twelve different Populus clones were grown at a 1 x 1 m spacing in a 0.36 ha plantation, established in February 1985 at Puyallup, Washington (47°12’ N, 122°19’ W), as part of a joint University of Washington/Washington State University Poplar Project. Lay-out, description and management of the plantation have previously been described (Ceulemans et al., 1 s8s). Five of these 12 clones were more intensively studied, i.e., 1 Populus deltoides (eastern cottonwood) clone from IL (III-005), 2 P. trichocarpa (black cottonwood) clones (clones 1-12 from Chilliwack, B.C., and clone 12-106 from central OR) and 2 hybrid clones between both species, clones 11-11 and 44-136, obtained by Heilman and Stettler (1985). Besides growth and productivity, different physiological, morphological and structural characteristics were studied during the first 3 (of a total of 4) yr of the experimental field plantation. At the beginning (May-June), middle (July-August) and end (September-October) of the third growing season (1987), detailed information on branching patterns and branch

Crown architecture in relation to productivity of Populus clones in the Pacific Northwest, U.S.A