Mercer Arboretum and Botanic Gardens will be closed December 24 and 25 as well as January 1.  The gardens will be open regular hours all other days, 8 a.m. to 5 p.m. Monday through Sunday (except the above holidays). The Gift Shop will also be closed December 24 and 25 as well as January 1.  The gift shop hours are 10 to 3, Tuesdays through Saturdays, and 11 to 4 Sundays.