A cultivation system and method. Conditioned airflow is directed downwardly and in crosswise opposition into a sealed cultivation chamber. The conditioned airflow passes through plants in the chamber, strengthening the plants, transferring heat, humidity and CO2, and scrubbing the plants of infectious particles, resulting in spent airflow. The spent airflow is recovered from the chamber below where the conditioned airflow was introduced. The spent airflow is conditioned and reintroduced to the chamber as conditioned airflow. A volume of the conditioned airflow directed into the chamber is substantially equal to a volume of the spent airflow received from the chamber, and a volume of the spent airflow in the system between receiving the airflow and conditioning the airflow is substantially equal to a volume of the conditioned airflow in the system between conditioning the airflow and directing the airflow, for maintaining consistent airflow within the chamber.
