Druid, killing greens.

[Jibartik]

Hey is there any easy way for a druid to clear up a bunch of greens? AFAIK the best way is with thorns, and to sit down, but that means if im camping an item 40 levels below me, i end up using a lot of mana healing and stuff...

Is there any way for a druid to reliably kill greens in zones where they cannot charm something in a quick and easy way? A lot of outdoor items involve killing a bunch of PH's heh, as a druid I'm at a loss as to how to do this efficiently.

Is there a really good ratio AOE im not aware of? or am I just totally missing the elephant in the room?