LEGO Harry Potter | Hogwarts Castle: Herbology Class 76445. Join Neville Longbottom™, Hermione Granger™ and Professor Sprout in the greenhouse. Care for the Venomous Tentacula, Mimbulus mimbletonia and Horklumps and pull Mandrakes from their pots. The 390-piece greenhouse measures approximately 12 cm high, 13 cm wide and 13 cm deep.