Impacts of therapeutic horticulture on happiness and loneliness in institutionalized clients with mental health conditions.

Introduction: Therapeutic horticulture (TH) can be considered a non-pharmacological approach to support psychiatric treatments for the improvement of physical and mental health, but information is lacking on whether it has advantages as compared to more conventional occupational therapies (OTs). Method: The study focused on institutionalized 25 clients attending TH among other OTs and 15 clients attending OT other than TH. The measures used were the 'Subjective Happiness Scale' (SHS) and the 'Social and Emotional Loneliness Scale for Adults' (SELSA-S), along with sociodemographic and clinical data. The study design was descriptive, observational and cross-sectional. Results: Scores obtained from the SHS and SELSA-S were generally similar for both groups, although 40% of clients in the TH group perceived relaxation. These are in agreement with previous studies performed with chronic schizophrenia clients reporting that TH might effectively decrease depression/anxiety symptoms, but the feeling of hopelessness and quality of life did not change, probably due to long-term institutionalization and required medication that may limit other effects. Within the TH group, clients preferred specific horticultural tasks and more days/week attending activities decreased loneliness and increased happiness. Conclusion: TH interventions as an integrative treatment option merits further study on both process and outcome evaluation, to maximize its effectiveness.