Terrain Trees not rendering on Gear VR

Long story short, I've got a small scene that I'm learning some VR stuff on with a Gear VR. I made a small terrain area and added some trees, some ambient sounds, some music, and some flowers. It's just supposed to be a nice relaxing area to get acquainted with the Gear and with VR development in general.

The problem is that in the simulator in Unity, all of the terrain trees show up fine, but as soon as I deploy to the Samsung, not a single one of the trees will show up.

But wait, there's more. In the place of some of the trees is a really tiny version of the tree prefab, instead of the large version that normally shows up in the simulator. Not for all of the trees that should be there, but for quite a few of them.

I've tried tweaking these settings to no avail:

Base Map Dist. Detail Distance Tree Distance Billboard Start Fade Length

Any tips in the right direction are highly appreciated. Thanks so much!