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The DNR Division of Forestry publishes the Big Tree Register, a list of the largest known specimen of each native tree species in the state. The register is published every five years. The nominating period for the 2015 register closed in Oct. 2014.
The register requires three measurements: trunk circumference, in inches, at 4 1/2 feet above the ground; total height, in feet; and average crown spread, in feet. The total size of a tree is calculated using the formula: circumference + height + 1/4 average crown spread. The tree of each species with the highest total is Indiana's largest. Each tree nominated is verified for species and size before acceptance in the register. View detailed instructions.
For more information, contact district forester Janet Eger at (812) 247-2479 or e-mail jeger@dnr.IN.gov.
The biggest big tree in the 2010 Register is a 136-foot tall sycamore in Johnson County with a trunk more than 25 feet around. The smallest big tree in the 2010 Register is an American hophornbeam (aka ironwood) in Vanderburgh County that is 12 feet tall and 3 inches around.