This case study describes two iterations of a cross-disciplinary Virtual Exchange (VE) project developed between the Universities of Bordeaux (France) and León (Spain), involving students of Applied Physics and Measurement Engineering (APME), and Electrical Engineering. The students worked together on designing a real garden in Bordeaux within ecological and sustainable parameters. This Project-Based Learning (PBL) activity helped them develop both their content knowledge and their competences in English, teamwork, time management, and self-evaluation. [For the complete volume, "Designing and Implementing Virtual Exchange -- A Collection of Case Studies, see ED609252.]