This talk examines the explosion of unpaid and unregulated internships on agro-ecological farms in Ontario. Drawing on primary analysis of farm internships, and referencing classical and contemporary debates in agrarian political economy, I argue that intern labour renders farm production sustainable by replacing off-farm inputs. Farm internships are a form of quasi-commodified labour that allow unprofitable farms to reproduce themselves despite the competitive pressures of industrialized agriculture. Similarly, internships are a form of non-monetized and non–institutionalized education through which ecological knowledge is acquired by aspiring farmers, yet is restricted to privileged subjects who can afford to work without a wage. I highlight some pressing challenges relating to the conjoined social and ecological sustainability of the agro-ecological farm movement and leverage the discussion to offer a novel intervention in classic accounts of the agrarian question.