- Harry Potter: "They're very valuable aren't they, sir?"
- Horace Slughorn: "Ten Galleons a piece to the right buyer."
- — Harry Potter catches Horace Slughorn stealing Tentacula leaves
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.[1]