The plant container (1) is formed as a pot removable from the permanent container (4) containing the electric or electronic ventilator and controls. The removed plant pot (1) is suitable long term for plant growth. The long-stay pot (4) is formed as a plant pot support with air-dynamic wind channel walls (5,6,7) and is shaped to take the plant pot. The long stay pot has projections and/or chambers for sucking in air. The air can be blown through damp to dry granulate (21) whereby impurities are deposited and converted by microbes into nutrients providing the long term care. Air can be recycled through wind channels.