Just my two cents, but how about this? Split the stone wall into parts and drop prop these individual parts. Instead of a water plane use a water-alike texture that fits to the ground (like the other farms). Finally attach the rice plants and drop prop these too. Here is a poorly created sample using Atlas on what it could look like (I've modified the Terrain Ambient color a little to let the texture look more blueish): I think I do not fully understand LordGood's approach (maybe someone else does?)