Shown below is the fourth plot I have cleared in the new expansions to get to the Poppy Pony. The plot is the 5th to the right and 5th one down from the upper ridge. The 5th plot to the right on the first row cannot be accessed.
There was only 1 item to be cleared from the plot.
Poisonous Pumice - 90,000 coins and 6 hours to clear.