- "They were now spending lesson after lesson learning how to look after Flobberworms, which had to be some of the most boring creatures in existence. 'Why would anyone bother looking after them?' said Ron, after yet another hour of poking shredded lettuce down the Flobberworms' slimy throats."
- —Ron grumbles about caring for the Flobberworms.[src]
Lettuce is a type of green leafy vegetable.
In 1993, after Rubeus Hagrid's disastrous Care of Magical Creatures on Hippogriffs, the students spent hour-after-hour in his classes shoving lettuce down the throats of Flobberworms. Ultimately, the flobberworms died, having been fed too much lettuce.
- Harry Potter and the Chamber of Secrets (First mentioned)
- Harry Potter and the Prisoner of Azkaban (First appearance)
- Harry Potter and the Half-Blood Prince (film) (Mentioned on a sign, as BLT)
- Harry Potter and the Deathly Hallows: Part 1 (Mentioned on a sign, as BLT)
- LEGO Harry Potter: Years 5-7 (Mentioned on a sign, as BLT)