About 90 students from the school planted a range of plants, including dryland species and water plants, around the park.
The planting was part of the Island Project which sees plants added to small parts of the wetland area.
The school has been involved in planting for about five years and became involved with the Island Project last year.
Friends of Mary Carroll Wetland co-|ordinator Unice Robinson said the tree planting aimed to provide more habitat at the park.
�This allows the students to take ownership of the area and it leads to it not getting vandalised,� she said.
�The area used to be a deeper water lake but has changed to a shallow water area due to a water level change.�
The project received funding from the State Natural Resource Management Office.