The present invention provides a method for producing an ice plant having increased contents of pinitol, β-carotene, vitamin K and proline, said method being characterized by adding a stress to an ice plant during the cultivation of the ice plant; a method for increasing the contents of pinitol, β-carotene, vitamin K and proline, which are functional components contained in an ice plant, said method being characterized by adding a stress to the ice plant during the cultivation of the ice plant; and others.