The material for the manufacture of the calendar was used from summer work. The students and their parents photographed beautiful, interesting and unique trees. Then a competition was held in each school and 4 pictures were selected from each school and placed on the calendar for 2023. The calendar is useful for everyone: students, teachers, parents, etc. It was printed out and distributed to participants involved in the project, including municipal officials, naturalists whom participants met, park visitor center staff, and other schools.