A plant pot includes a pot having an enclosed space and a room defined therein. The room receives soil therein. At least one passage communicates with the room and the enclosed space. A tube is connected to the pot and has a path defined axially therethrough, the path respectively communicates with interior and exterior of the enclosed space. A resistance member is located in one end of the tube and has multiple micro paths which communicate with the interior of the enclosed space. A resistance is formed when exterior air passes through the tube and the resistance member so as to control speed and volume of the exterior air into the enclosed space.
