If you were visiting a small town in the intermontane west and noticed many houses of a greek revival style, bordered by irrigation ditches and rows of lombardy poplars you would reasonably conclude that the town had been settled by what group?

I believe the answer is: The mormons

It is very common to see a group of mormons to design their living environment in such a way that replicated the 1800s look of greek revival style so it would most likely reflected in their architecture and their way of arranging the trees.

They tend to share strong sense of commonalities among their members and tend to have a different codes of living compared to the society that surround them.