what height is tree caliper measured
8-10ft tall, 2.5â â 3â caliper = approx. 10-12ft tall. A clump tree or evergreen tree is measured by height. A clump tree, like a River Birch, is a close group of trees with multiple trunks. A 10-12â Tall Clump River Birch means that the size of the tree will range from 10 to 12 feet tall at the time of planting.