About 30 trees near the new Ridge View Secondary College in Baldivis were targeted, with trees on Sixty Eight Road, Viva Boulevard, Solis Boulevard and Verdant Approach ruined.
Residents witnessing anti-social behaviour are encouraged to contact Police on 131 444 or contact Crime Stoppers on 1800 333 000.
Please note: Calls to 000 should only be made in the case of an emergency.