Harry Potter: "They're very valuable aren't they?"
Horace Slughorn: "Ten Galleons a leaf to the right buyer."
Harry Potter catches Horace Slughorn stealing Tentacula leaves[src]

The leaves of the Venomous Tentacula plant are very valuable. Horace Slughorn was known on at least one occasion to steal them from the Hogwarts greenhouses, stating that they were worth 10 Galleons a leaf to the right buyer.[1]. Leaves from an unhealthy specimen would not fetch very much money, but an experienced potioneer could brew some dragon dung fertiliser that would make the Tentacula healthy again.[2]


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