The Harry Potter Compendium
The Harry Potter Compendium
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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. The fertiliser is also noted to be Professor Sprout's preferred type.

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