With the rapid aging of the global population, Taiwan officially entered an "aging society" in 2018, with the elderly population accounting for 14% of the total population. As elderly individuals age, they often experience multiple declines in physical, psychological, cognitive, and social functions. Among them, about one-third of the elderly experience feelings of loneliness and face challenges such as reduced social interaction and social isolation. Horticultural therapy, as a non-pharmacological intervention, promotes the stimulation of the five senses through group participation in planting activities, thereby improving physiological, psychological, and cognitive functions. At the same time, horticultural therapy helps enhance physical and mental health, strengthen social support, and build interpersonal relationships, which can help alleviate feelings of loneliness among elderly individuals in the communit.