chocolate frogs or bertie botts every flavour beans? diagon alley or hogsmeade? herbology or potions? meeting sir cadogan on your way to a class or running into peeves? butter beer or pumpkin juice? playing quidditch or watching from the stands? resting by the lake or going into the forbidden forest? hogwarts kitchens or the room of requirement? ancient runes or divination?
Another impressive plant studied in Herbology is Gillyweed. When eaten by a witch or wizard, they will grow gills and webbing so that they can easily swim underwater! These effects can last for about an hour, although there is dispute among Herbologists.
Harry Potter used Gillyweed to compete in the Second Task of the Triwizard Tournament, enabling him to swim underwater.
“Three times a week they went out to the greenhouses behind the castle to study Herbology, with a dumpy little witch called Professor Sprout, where they learned how to take care of strange plants and fungi, and found out what they were used for.”