Can you imagine a world in which the built environment around us is 3D printed from living materials? That buildings will germinate, bloom, wither, produce new kinds of material, and eventually return back to the soil? To Grow a Building is a performative lab space that 3D prints – in real time – a live structure. The project presents a new approach to integrating flora into the design process, by developing a novel material for 3D printing, through which seeding is an inseparable part of the fabrication process. To Grow a Building is a gate into a future world in which there are people who build buildings, and there are people who grow them.