Wassailing is a traditional English custom involving singing and drinking to the health of trees, particularly apple trees, to promote a good harvest for the coming year. It typically takes place during the Christmas season or in January, often accompanied by the sharing of spiced cider or ale. Participants may also visit homes to sing and spread good cheer, similar to caroling. The practice has historical roots in both pagan and Christian traditions, blending agricultural rituals with festive celebration.