Cenarion Plant Salve

Cenarion Plant Salve is some sort of medicine for flora developed by the Cenarion Circle. Various amounts of this salve can "cleanse" plants in Felwood to produce beneficial buffs and items for players.

Source
This item is a quest reward from the following quests:

Cenarion Plant Salve as a quest objective
This item is an objective for the following quests: