The Gesellschaft für Internationale Zusammenarbeit (GIZ) has implemented Development-Oriented Emergency and Transitional Aid (DETA) projects in South Sudan since 2008. Active in Greater Equatoria, GIZ DETA supports host communities, returnees, and IDPs to rebuild their lives. Amid the country’s post-war challenges—repatriation, economic diversification, and peacebuilding—GIZ DETA operates four components: institution building, agricultural development, infrastructure rehabilitation, and peacebuilding. With repatriation concluding, the program now emphasizes linking relief, rehabilitation, and long-term development (LRRD). Given that 80% of South Sudanese depend on small-scale farming, agriculture is key. Since April 2012, GIZ DETA has piloted Farmer Field Schools (FFS) in Central Equatoria to enhance productivity using Low External Input and Sustainable Agriculture (LEISA). This study evaluates the FFS pilot and explores scaling to Eastern and Western Equatoria, using qualitative research across Morobo, Magwi, Yambio, and Nzara Counties. In the Greenbelt, hunger is less severe, but farming remains subsistence-based with low yields and limited mechanization. Lack of financial services, poor roads, and weak market access hinder commercialization. In Morobo, FFS supports surplus-producing farmers with market potential, though illiteracy, especially among women, is high. Improvements suggested include diversifying training (e.g., pest management), expanding extension methods, and investing in storage facilities. Sustainable FFS requires long-term strategies and collaboration with GIZ FSAD. In Magwi, a conflict-sensitive approach is needed due to ethnic tensions. In Yambio and Nzara, unstable resettlement complicates FFS implementation. Quick-return agricultural activities like dry season vegetable farming are recommended to attract engagement.