Abstract: An extended term hydroponic cultivation apparatus and method provide a growth environment for a plant to develop an oxygen root structure and a water root structure as the plant matures. The root structure of the plant is carried in a growth chamber containing an initial water level with an air gap defined above the water level for development of the oxygen root structure in the air gap. Water root structure development progresses downwardly to a bottom of the growth chamber as the plant consumes water contained within the system until reaching a terminal growth length in a terminal water level. A float valve maintains the water in the system at the terminal water level to sustain plant growth for an extended temporal duration. A drain valve allows for evacuation of water for replenishment with a fresh source of water to the terminal water level.