Today I began setting up a scene in Unreal Engine 4. I began by watching this tutorial by Levon Church that had a handy link for importing some ready-made foliage. I was able to create a grassy landscape, then import some happy little trees, then import my fountain.
Fountain on grass
Next steps will be to see what I can create directly in UE4, vs. what needs to be created externally in Maya and Zbrush then imported.