The Greenhouse is an Architect Artifact found inside of a tunnel network in the Arctic Spires. The greenhouse is comprised of four glass containers that would have housed plants in them. One of the containers has been dislodged from the wall. Presumably, it was used for growing and studying flora.
Data Bank Entry
This alien structure - found commonly shielded from natural sunlight - appears to be a carefully controlled containment and cultivation environment for natural flora. In other words: a greenhouse.
The main chamber appears to be capable of precise temperature and humidity control, allowing plant-life to be grown carefully outside of its natural habitat.
|Source: Scan a Greenhouse|