In this study, we have developed an IoT-based plant growing system to address the pressing issue of supporting individuals with developmental disabilities and other challenges in their daily and social lives. The primary objective of the system is to facilitate environmental adaptation by monitoring the user’s daily routine and indoor environment, while also providing assistance in plant cultivation. The flowerpot system we have developed is equipped with various sensors, including temperature, humidity, light, and moisture sensors. These sensors enable the comprehensive monitoring of both the plant growing process and the indoor environment. Additionally, the system features a built-in display and speaker, serving as a user interface that facilitates communication between the user and the anthropomorphic flowerpot character. The objective evaluation of the system was conducted through electroencephalography (EEG) measurements, whereas subjective evaluation involved the use of questionnaires and interviews. The results confirmed that the system has a relaxation effect on the users.