a protector of growth

[Schortt]

They definitely should not be aggroing anyone who is invis (and FD should stop them from attacking you, though iirc they should never get reset by FD) - zoning in invis to PoG was always safe in era on live and running around most of the zone invis was safe as well. It was just if your invis dropped you were screwed if PoGs weren't already engaged.

From the good guide I linked before:

None of the mobs in this zone see invis EXCEPT for the four giant treants, the quest NPCs, agitated forest spirits, and the treants near Tunare's tree (and Prince Thirnig and Tunare, obviously).

I'll go mess around with this soon to check PoG behavior.