There's several good aoe spots in the outlands(you can't have mine lol):p It basically takes a team of 2. It could be done if you are an sl lock but just not worth the time. I've powerleveled and farmed with basically every class with this ONE warlock spell. Just have your buddy round up a bunch of mobs and hold them in place while u toss out 5-6 seeds out.

The spot you are going to be farming at is the ramp leading down to tendris warpwood(the big tree guy). There is a ledge on each side of this ramp. The mobs you want to target are the groups of trees and the round blue caster things. You can do the larger patrolling trees but they do punt you back so if u screw up youll get punted to the bottom and die.