The Advent calendar Petronella Apfelmus is suitable for children, teenagers, and students aged 7 and up, offering a mix of experiments, nature, general knowledge, and eco-friendly materials. Petronella and her friends teach magic tricks, craft together, and share interesting knowledge about apples and life in the magic garden. Everything needed is included in the calendar. The calendar contains 24 eco-friendly cardboard gift boxes. A companion book provides background information and images to enhance the understanding of the experiments.