Water dropwort is an aquatic perennial plant of the Apiaceae family and is a wild vegetable originating in the tropics of Asia. The plant prefers moist soil and growing in partial shading 60 - 70% conditions. The two factor experiments were arranged in randomized complete design (RCD) with three replications. Factor A was four planting spaces (4 × 2 cm; 4 × 3 cm; 4 × 4 cm and 4 × 5 cm). | The effects of plant spacing and frequency of aeration on the growth and yield of water dropwort Oenanthe javanica Blume DC. in hydroponic system