From its spread in the thirteenth century onwards, short-term leasehold became one of the most common and powerful institutions of land management in Western Europe. Its rise is often strongly connected to the commercialisation of agriculture and short-term profit-seeking, with overexploitation of the soil as a consequence. However, when looking closely at short-term lease contracts of the fourteenth century, these extensive documents often contain a multitude of clauses on the upkeep of the soil, water management, and care for the present fauna and flora. This paper aims to investigate how the management of the soil was regulated through a leasehold in Cambrésis, currently in the north of France, through an in-depth study of the clauses on fertilisation by manure and care for the soil, as recorded in two rather unique fourteenth-century lease ledgers. What can these contracts reveal about contemporary agricultural practices, such as fertilisation? How did the administrators of the Saint-Julien hospital and the collegial chapter of Saint-Géry in Cambrai safeguard the long-term health and value of their leased-out properties in a period of severe crises and rising commercial pressure? Through this research, this paper proposes that short-term leasehold could, in certain conditions, stimulate forms of environmental stewardship.