Agricultural growth corridors (AGCs) have begun proliferating across the actual and policy landscapes of southeastern Africa. Cast as an emerging megaproject strategy, AGCs combine the construction of large-scale logistics (i.e., roads, railways, ports) with attracting investment in commercial agribusiness and smallholder farming. While scholars have long attended to spatial development schemes in the Global South, literature on the rising AGCs of Africa's eastern seaboard has only recently shifted from anticipatory to empirical studies as policy implementation reaches full force. The article reflects on a new crop of studies that confront the problem of tracing policy imaginaries to the people, places, practices, and ecologies shaped by AGC schemes. In contrast to scholarship that accepts corridors as given entities, we explore directions for research that interrogate the grounded yet provisional becoming of these megaprojects. At such sites, the return of high modernist development logics encapsulated by the corridor concept may be questioned.