Species Differ in Responses to Tree Shelters

"Effects of tree shelters on height, caliper, and diameter at breast height of 11 landscape tree species and cultivars were investigated in 2 nurseries during a 4-year period; the ratio of height to caliper was calculated as an indicator of trunk sturdiness. Species differed greatly in their responses, ranging in the fourth year from none to 44% and 55% height increases of Magnolia Merrill and M. stellata accompanied by 18% and 14% caliper increases. Acer griseum, Carpinus caroliniana, Cercis canadensis, Cornus Celestial and Constellation, Prunus serrulata Kwanzan, and P. subhirtella autumnalis exhibited more modest height increases, but also caliper decreases, compared to controls without shelters. Malus Adirondack and Syringa reticulata Summer Snow did not benefit. Two shelter sizes and severe winter weather also affected the results of some varieties."