Which caliper measurement indicates that a tree is greater than 4 inches in diameter?

The correct choice reflects an accepted practice in tree measurement. The caliper measurement is essential in the nursery and landscape industry for determining the size and maturity of a tree. Generally, when measuring the caliper of a tree, it is done at a standard height above the ground, typically 6 inches for smaller trees, and 12 inches for larger specimens.

In this case, measuring 12 inches above the ground is significant because trees with a trunk diameter greater than 4 inches are usually measured at this height. This standard allows for a consistent method to determine the trunk size that represents the tree's health and maturity accurately. When a tree has a caliper measurement of 12 inches above the ground, it generally indicates that the trunk's diameter has surpassed the threshold of 4 inches, ensuring that the tree meets the accepted standards for size in landscaping projects. Thus, measuring at this height aligns with industry practices for accurately gauging tree size.