It would be great if there was either 1) a house with both herb and crop plots or 2) potions to change a crop plot to a herb plot or a herb plot to a crop plot. This would probably be something that was only effective for a single garden plot for the next plant. So after you use Potion X on a crop plot, it would turn into a herb plot and you can then plant a herb seed. After harvest of that herb, the plot would once again be a crop plot. Similarly using Potion Y on a herb plot would turn it into a crop plot then you can plant a crop. After a harvest, the plot returns to a herb plot.