| abstract | - Greenhouse Three is where Herbology classes are taught to every student, except first-years because in Greenhouse Three there are several plants that they would not be able to cope with. The room has more dangerous species, such as the Venomous Tentacula, as it is for the advanced students. First year students take the class in Greenhouse One, which has no dangerous material.
- "Greenhouse Three houses magical plants too dangerous for first-year students, including a Venomous Tentacula and Professor Sprout's supply of Mandrakes."
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