What does Deuteronomy 20:19 mean?

When you’re attacking a city for a long time, don’t cut down its fruit trees. You can eat from them, but don’t destroy them. Trees aren’t people—they shouldn’t be part of the battle. Deuteronomy 20:19 - Modern Text Bible

(Even during a siege, fruit trees should be spared because they provide food and aren’t part of the conflict.)