To provide a negative ion-generating composite material which radiates negative ions and emits far infrared rays and therefore has a synergistic effect thereof, to provide a negative ion-generating material for garden trees, given by using the composite material so as to have a new effect, to provide a negative ion-generating ball given by using the composite material and used as a part of ceramic ware, and to provide a negative ion-generating sole of a shoe, given by being impregnated or coated with the composite material.

The garden trees are grown by utilizing the negative ion-generating composite material. The negative ion-generating ball is positioned and used in a desired place or room, so that application fields of the negative ions are enlarged, and simultaneously application fields of the negative ion-generating ball are enlarged. The negative ion-generating sole of the shoe has an effect of the negative ion on the human body. The negative ions and the far infrared rays synergistically have a growth promotion effect on animals and plants, including the human body, so as to be effective in various fields.