Dragon dung fertiliser is a solution used to help Venomous Tentaculas and (presumably) other plants grow. Its main ingredient is Dragon dung, the potion's namesake. In 1997, Horace Slughorn asked Harry Potter to brew some in order to collect the otherwise unvaluable leaves of a Venomous Tentacula.
Appearances
- Harry Potter and the Half-Blood Prince (video game) (First appearance)