So... we're playing an immersive mode game, and we're kinda halfway through Ashlands and contemplating what we'll need to bring to the Deep North.

Without any major spoilers, are there any Ashlands materials that we will need to bring with us up north? Without portals, the trip between the poles will be a serious pain in the butt, and if it turns out that we're going to need a billion grausten or a steady supply of ferns, that could be a problem to address ahead of time.