In today's highly competitive global economy, the farm enterprises are confronted, as any manufacturing enterprises, with permanent changes in their environment. Responsiveness and flexibility are required to support farm enterprise performance and adaptation to their new contexts of production. Enterprise Modeling is a powerful tool supporting the design process of adaptive enterprise system in the manufacturing sector. It allows semi-formal models to be defined to provide a common understanding and communication on various enterprise aspects. This paper explores the use of such enterprise models to characterise and manage flexibility in farm enterprise through the example of the relationships between a farm enterprise and its business environment.