This study aims to enable plant production even during sunless periods using a LED plant growth unit by controlling input variables such as temperature, soil humidity, atmospheric humidity, light intensity, wind speed, level of carbon dioxide in greenhouses and output variables such as lighting, cooling, heating, ventilation, irrigation by means of fuzzy logic control (FLC). It is expected that these indoor tests will provide means to grow plants such as tomato, pepper or cut flowers especially in regions that have sunless and cold winter months like Isparta. To this end, the design of the control unit, development of the Fuzzy rule base, and outline and simulations of the LED plant growth unit have been examined. The study focused on the factors affecting the greenhouse control such as ambient temperature, outside temperature soil humidity, CO2 production, wind speed, light intensity, heating, cooling, ventilation, irrigation, the LED plant growth unit as well as on the Fuzzy designs for lighting. The LED plant growth unit has been operated with direct current supply (DC). The findings of the indoor tests carried out with the designed LED plant growth unit for pepper and aromatic chamomile are presented.