Over the last two decades, significant changes in lowland rice cultivation practices have occurred in mainland Southeast Asia. Here, we compare lowland rice farming in six provinces in northeastern Thailand and four districts in Savannakhet Province in southern Laos and consider the ways that agrarian change, including the deepening of capitalist relations, is occurring. Some of the most important changes taking place relate to increasing mechanization, remittances, changing bases of labour's simple reproduction, and the increased importance of international markets, especially for organic rice. These changes and associated government policies are having a considerable influence on agricultural practices. The Chinese market for organic rice from Laos is reducing pesticide and herbicides use and prolonging hand‐transplanting of paddy, while encouraging farmers to use uniform sized high‐yielding rice varieties, and abandoning local seeds. Rice exports from Laos are having both positive and negative environmental effects, indicating the nuanced influences of particular international markets and government policies.