A hydroponic apparatus includes: a soil surface section including a through-hole through which to insert a plant, and separating a subterranean space where a subterranean part of the plant grows and an aerial space where an aerial part of the plant grows； a growing tank, together with the soil surface section, forming the subterranean space, where the subterranean part is placed； germination enhancer supplying units supplying a germination enhancer, reserved in a germination enhancer reservoir, to at least one of the aerial parts and the subterranean parts； and a control unit controlling a mode in which the germination enhancer supplying units supply the germination enhancer to the plants.
