The first step to alleviate the problem would be to make the tree textures double sided, so you can see from the bottom what you can see from the top.
That approach would probably coast very little frame rate and should already help immensely with the problem.
The other option would be to put a standing "Star" or "Cross" patten of textures into the trees so you have one layer of textures you can see from the side in addition to the ones you can see from the top.
I'm not proposing to add 3d models to the trees, just extra textures so they can be seen from all angels.
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