Living edible fruit trees could be considered as monuments of permanent nature to be used in defining and marking corners when it has a diameter of not less than how many centimeters?

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The idea is that a marker must be substantial enough to endure over time and remain identifiable for future surveys. For a living edible fruit tree to serve as a corner monument, its trunk needs to be thick enough to withstand weather, pruning, and potential disturbance, while still being clearly visible. A minimum diameter around 15 cm at standard height (typically measured as diameter at breast height) provides enough girth to endure for years, making the tree a reliable reference. If the tree were much smaller—around 5 cm—it could be easily damaged or die, losing the marker. Larger diameters like 25 cm or 50 cm, while robust, are less practical and unnecessary for most field situations. So, 15 cm is a balanced, practical threshold that ensures permanence and recognizability as a living monument.