Zhiyuan Social Work Service held yesterday a horticulture class in the Southern District's Liangdu Park to invite old people to learn flower planting. Flower planting is a kind of horticulture therapy which establishes close bond between plants and people. The therapy is expected to help people to relax, to ease tension, and to improve confidence and sense of achievement so as to form ideal interpersonal relationship. Flower planting needs time, energy, expectation, and physical strength. The process of planting is the process of therapy.