Tanzania Research and Conservation Organization contribute to the National Tree Planting Campaign through active participating in tree planting to protect and restore water sources in Mbarali river catchment which is an important water tower for Great Ruaha river. Tree planting exercise was collaborative and involved different stakeholders including local community, Water User Association, Primary and secondary school students, National Environmental Management Council, Sokoine University of Agriculture, Tanzania Forest Service, University of Dodoma, and Local Government Authority. A total of 30,000 water friendly tree were planted in degraded water sources and along Mbarali river. Tree planting campaign was organized by Sustainable Catchment Management through Enhanced Environmental Flow Assessment and Implementation for the Protection of the Western Indian Ocean from Land Based Sources and Activities in Tanzania (EFLOWS project) (https://www.sua.ac.tz/project/sustainable-catchment-management-though-enhanced-environmental-flow-assessment-and).