athelas

So.... I read a lot of fanfiction. And it seems that a lot of fanfic writers take the opinion that Athelas would be powerful in the hands of elves, whether they are healers or not, and anyone who happens to be a king (Thranduil, for example), would find this plant very useful. Is this true? Or...

Hello everyone, this is my first thread. Anyone knows the plant that was actually used in the Lotr or Hobbit movies as Athelas? I even started a stackexchange thread on this topic and in a few hours there are already a bunch of people trying to figure it out from the pictures, but if anyone has...