Dragon dung Fertiliser

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)