Can plant material be considered part of cultural heritage? A lesson from Vitis vinifera L. remains stored in the Museo Archeologico Nazionale di Napoli, (Italy)

•The archaeobotanical remains of the Vesuvian area are an exceptional cultural heritage.•The most important part of these materials are housed in the MANN Museum.•The peculiarity of Vitis vinifera remains is their apparent uncharred conditions.•The radiocarbon dating indicated that the age of the Vitis remains is 1782–1796.•This work underlines a chronic lack of archaeobotanical specific skills.