Multiple choice general knowledge In which Greenhouse were the Mandrakes repotted? 1 2 3 4 Reveal answer Fill a bubble to check yourself C Correct answer Explanation In Harry Potter and the Chamber of Secrets, Professor Sprout teaches the second-year students to repot Mandrakes during their Herbology lessons in Greenhouse 3. The Mandrakes are later used to cure those petrified by the Basilisk.