Disclosed is a flowerpot for arranging flowers and growing plants having dual-container construction, i.e. including an external container for containing water and an internal container having a number of holes formed thereon, so that water can be easily added or changed, aesthetic impression can be improved by various decorations, and flowers or plants can be stably supported. The flowerpot includes an external container for containing water; an internal container positioned to contact an inner surface of the external container and having a number of holes formed on a lower portion of the internal container; and a length-adjustable multifunctional support member placed on a central portion of a lower surface of the internal container in an upright position.