Tree Materials and Mesh Joining?

Sorry for the very poor title. I didn’t know how to summarize what I needed into one line.

I am relatively new to the entire game development scene, but I, at this point, have a basic understanding of how everything works UI-wise in UE4. Yesterday I got around to making some trees using the sapling add-on in blender to export into UE, and I love the way they look, but I found that with every leaf being rendered, it kills fps.

My questions are: How do I combine all of the leaves on one tree into one mesh, and then map the material so that it still has the leaves looking the way they are?

Also, if there is a better solution in general, I am all ears. Thanks in advance to anyone who helps!