Good trees that scale up well for virtual reality?

I'm working on a game for the oculus rift where the player is about the size of an ant, and I want to put in some huge trees to emphasize scale. I've been using the ones from the default unity package, but the leaves render weird in virtual reality, with some flickering effects or slight glittery kinda stuff (the scale of the trees might be emphasizing it, as they are around 110 scale) Does anybody know of good tree assets that would look good giant in vr?

Thanks!