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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.

Mathilda Grimblehawk's partner used dragon-dung fertiliser to restore a sapling Wiggentree brought from the forest by Don Harrison.[1]

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