There's a couple treants in SK, in the Northeast corner of the zone. They were blue to my BST through her 20's, but I never played with them much because she had no way of splitting the two spawn and, being druid types, they'd root and nuke her to death while healing one another. I imagine wizards can at least root one and pull the other.
Keep in mind they have a lot of factions associated with them; mostly regarding Surefall Glade and druids.
Wow. Regular ol' Joph fan club in here.