The agriculture, interpreted in sustainable terms, plays a central role in the protection of territory, constituting with an eco-compatible productive activity but also, founded, therefore, on biological and natural rules.  The contemporary city has expanded to excess, leaving nearly always the protected and agricultural zones as reservoir for the city increase; the XX century has been characterized by a clean separation between agriculture and city.  Some recent experiences, instead, demonstrate as a possible re-balance of the city ecosystem can happen just through the hybridization of the two arrangementss, and the planning of such hybridization is one of the challenges of the contemporary plan.