That greenhouse is a rather interesting place on campus. It was constructed to house as many species of plants as possible that could be sustained by a greenhouse. These plants were collected from all over the world as a means to preserve the species should some tragedy befall the continent, kingdom, or city they are located in. Considering the likelihood of grimm attacks on civilization, this is always a constant threat. Additionally, many of the plants found within the greenhouse are poisonous or contain some valuable ingredient that can be used in combat. There are some classes students can opt to take that help them identify poisons made by these plants from smell, and there is also the objection to take injections of the poisons to build up an immunity to them.