The nascent field of biodesign uses the biological affordances of organisms to address some user need. These can range from the development of novel materials, which the designer actively investigates, to applications of synthetic biology or the creation of bio-digital hybrid systems. Within biodesign there is a question for interaction design: what will interactive systems look like in a guided and grown environment, rather than a built environment? In this workshop, we will explore new technologies that rely on symbiotic relationships between the user and organisms that participate in interactive systems. The goal of this workshop is to engage the interaction design community in exploring new aspects of designing for living computational systems.