What type of trees are categorized under the measurement grades for nursery stock?

The categorization of trees under the measurement grades for nursery stock is primarily focused on their intended use in landscaping, agriculture, and horticulture. Fruit trees are specifically valued for their ability to produce edible fruits, which makes them essential in both commercial and residential settings. They are regularly measured for dimensions such as height and trunk caliper to ensure they meet certain quality standards for growth potential and fruit production.

In contrast, while pine trees, subtropical trees, and even dead trees may have their own classifications and importance in various contexts (like timber production or ecological studies), they do not typically fall under the same grading system focused on nursery stock as fruit trees do. This grading system is specifically designed to assess the viability and market standards of trees that are actively cultivated for performance and yield, which is why fruit trees are the most relevant answer in this context.