In May the fertile season is celebrated with a series of ancient festivals in the towns of Northern Lazio. One is the Wedding of the Trees, ?Lo Sposalizio dell’Albero?, in Vetralla which is the symbolic wedding. This festival dates back centuries and is considered to be the first Italian eco festival. It is a tradition that requires the town to renew its ?marriage? with the forest every year in order for the forest to remain the property of the town.