A method for raising leaf-and-stem vegetables and a light source device used in the method are provided, which can make production cost of leaf-and-stem vegetables reduced and commercial value thereof enhanced by irradiating parts of leaf-and-stem vegetable with a light optimum therefor. The method for raising leaf-and-stem vegetables by irradiating the vegetables with light, includes the step for a stem growth-inhibiting light source to irradiate tops of the stems with light having a blue component light at high ratio, which inhibits the growth of stems, at least during an initial growth period when the stems and leaves become distinguishable from each other.
