Green Rhythms is a symbiotic interactive installation that translates the circadian rhythm of plants into a tangible sensory experience shared between humans and plants. Grounded in more-than-human design and time-ecology frameworks, this artwork visualizes the differential physiological processes of photosynthesis and nocturnal gas exchange through the media of light and air. The environmental light and the carbon dioxide exhaled by audiences establish a cycle of metabolic exchange. This work reimagines interaction design as a medium for ecological coordination, which emphasizes decentralized temporality and the shared rhythm across species.