Hmm... maybe Ginarie should be red, perhaps? If we're all doing colors, that is.
Actually, I was rereading these - since we're doing Revised Ranger, how does the first bullet point of the Natural Explorer stack up with this? for reference, that reads: "Difficult terrain doesn’t slow your group’s travel." Which... I suppose skirmishes aren't exactly travel. Would Plant Growth be able to create favorable terrain? If I recall correctly, it makes basically doubly difficult difficult terrain.