Numerous studies have documented Indonesia's food and medicinal plant knowledge. Although ethnobotanical practices in Indonesia have been extensively studied, research on the traditional knowledge preserved by the Indonesian diaspora remains scarce. Therefore, this study sets out to understand how these practices are retained or transformed among Indonesians who been dispersed from their home, in particular those who have migrated to the United States. Semi-structured interviews with 66 key informants and a survey of 124 respondents were conducted. The results were analyzed using the relative frequency of citation (RFC) index, Shannon diversity index (H’), and principal com analysis (PCA) to understand how social and demographic characteristics such as age, gender, length of residence, and participant’s age at arrival in the host country influence traditional knowledge, cultivation practices, and plant use.According to responses from the interviewees, a total of 131 plant species representing 98 genera and 57 families have been cultivated by the member of the Indonesian diaspora in the United States. Our study also identified five plant species with the highest level of utilization, including Citrus hystrix DC, Syzygium polyanthum (Wight) Walp, Curcuma longa L), Ocimum basilicum L., and Manihot esculenta Crantz. In addition, our analysis revealed the importance of age at migration as a key factor in knowledge retention while long-term residence may challenge the continuity of traditional ethnobotanical practices among Indonesian migrants. We also recorded the cultivation management practices employed by informants in the United States, which include container cultivation, intercropping systems, and organic farming. Overall, our study provides insights into how traditional plant knowledge is preserved by Indonesian diaspora in the new environment. It also reveals challenges faced by Indonesian diaspora in sourcing food and medicinal plants, and ways they adapt with local substitutes. These ethnobotanical insights can play a role in formulating conservation strategies and stimulate demand for Indonesian food and medicinal plants
