Cultural heritage is an important contributor to sustainable urban development, and its conservation is considered a global task. Previous research has primarily focused on the conservation of heritage buildings within architectural contexts and world heritage sites within geographical contexts. However, there is a notable gap in conservation of green cultural heritage (GCH) within a landscape-based framework. This study used the extended theory of planned behavior to explore the factors and pathways that influence the public's behavioral intentions toward GCH conservation. Based on 1075 questionnaires collected in Tokyo, Japan, the hypotheses of the newly constructed theoretical model were tested using partial least squares structural equation modeling. The results show that perceived behavioral control has the greatest positive influence on citizens' GCH conservation intentions and behaviors, while social norms do not influence people's behavioral intention to conserve. In the extended factors, the environmental awareness which including heritage awareness and cultural attachment, significantly influences public attitudes towards conservation. Additionally, environmental perception, including perceived usefulness and perceived quality, significantly affects the public's conservation intentions and behaviors, respectively. Our findings have implications for local governments and policymakers to enhance public participation in GCH, as well as some several new theoretical interests for further studies.