The capacity of plants and water is different. The Plantui Smart Garden 3 can hold three plants. The Plantui Smart Garden 6 can hold six plants or a 12 plants pre-grow tray or a microgreens tray with four areas. Capacity: 3 plants / 6 plants Water reservior: 1 liter / 3 liters Weight: 1.36 kg / 2.45 kg Diameter: 19 cm / 29 cm (35cm with handels) Height: 24 cm / 21 cm