The trees on the ramparts of the fortifications are often considered a factor of degradation. Instead, they are essential elements, as they constituted a reserve of wood useful in the event of a siege and which, in times of peace, formed pleasant walks. This was also recommended by several treatise writers and the research conducted for the case of Palmanova has shown that the curtains and also the external areas were planted in the Venetian period and in the Napoleonic era.
