Excavations and sampling conducted at the ancient city of Lattara (Lattes, France) have revealed a foundation offering in a small pit situated in a storehouse of the Roman port of the city. This offering, dated to around 25-60 A.D., consisted of pottery vessels, oil lamps, a coin, a pin (made out of bone), an egg and several vegetal products. The archaeobotanical remains presented in this work are charred seeds, fruits and charcoal. The primary aim of this study is to analyse whether the plant taxa are unusual or the same ones that appear in the contemporary domestic contexts in the city, in order to assess the possibility of a special use of the plants related to, for instance, their symbolic or magical value. The discovery of domestic or public burnt offerings containing plant remains is unknown in the Mediterranean region of France during the Roman period, except for those found in funerary contexts.