When the Phytotron opened in 1973, the cost of the facility was about 20 million NOKs. The facility consisted of 3000m2, where 500m2 were used for growing plants. The facility now consists of almost the same area, except for the greenhouses that were demolished in 2017.
In 1973, the Phytotron also had access to 8000m2 fields close to university campus, which were used for research purposes. Today these fields are no longer available as a new cemetery was needed for the population of Oslo.