I'm not so sure about the muggle equivalent to Herbology being Biology. I feel like it would be more easily & appropriately related to something a bit more specifically plant based- Environmental Science or something similar
From Harry Potter sweetheart to Me Before You heart-throb, Matthew Lewis wows the crowd in his Ted Baker Suit at the premiere. Download, watch and fall in love with #MeBeforeYou - September 26. On DVD and Blu-Ray - October 10.