Background/aim: The Tree Theme Method ® is an intervention based on creative activities and occupational storytelling. The Tree Theme Method ® implies that the clients draw and paint trees symbolising various periods in their life. The pictures are then used as a starting point to tell their life story to enhance their wellbeing and management of their everyday life. This study aimed to evaluate if changes observed among clients regarding their wellbeing and everyday occupations, between baseline and the end of their term of the Tree Theme Method ® therapy, persisted three years after the completion of the intervention. Methods: This study had a quantitative design. Thirty-one former clients were recruited to a follow-up three years after completing the intervention. Self-rating questionnaires were used regarding psychological symptoms, selfmastery, sense of coherence, activity level, occupational performance and satisfaction with occupational performance. Non-parametric methods were used for the data analysis. Results: The findings revealed positive significant changes regarding sense of coherence and occupational performance and satisfaction with occupational performance, measured between the end of the intervention and at the time of the three-year follow-up. Furthermore, the respondents' ratings regarding psychological symptoms, self-mastery, activity level and the extent of satisfaction with performed occupations were found to be stable. Conclusions: The Tree Theme Method ® appeared to function well as an intervention in psychosocial occupational therapy, where the aim was that a client would enhance their wellbeing and management of their everyday life. However, there is need for further evaluation to assess the effects of the Tree Theme Method ® intervention.