Hey, Ashborn and his race of plant-people have no magic of their own. And it's not just him; none of the Ogwundi have a shred of magical affinity. Though it might be interesting to have Ashborn respond to his reasoning; the Ogwundi have no society and culture of their own to speak of, and thus no religion of their own. Some adopt the religions of other races, but most don't even bother. Ashborn is in the latter category.

And I doubt he'd have seen any before too, since they are plants.