When Arthur goes to work in the front yard to escape his wife?s nagging, he accidentally walks into a ?best yard? contest with his neighbor.

Thanks a bunch! Let me fiddle with it a bit...

I have to agree with Richiev here in that it doesn't tell us anything other than a man leaves his house and begins a small rivalry. What I think the log line should focus on is the competition he will be having against his neighbour instead of how it starts.

This logline tells us nothing about the story.

"He walks into a "Best yard" contest with his neighbor... doe he watch the contest? Why does he care? Does he enter into it as well as his neighbor? What are the stakes? Why is it important to him? What will he lose if he doesn't win? What is his goal? How will he achieve his goal?

Anyway; there is a premise here but I don't see story unless you add to it.