If we're going to have our own gardens, well... shouldn't we be able to "prepare" plots as we see fit?
1. Potion of Cropperisation
This potion, applied to a herb plot, converts it into a crop plot.
2. Potion of Herbalisation
Apply to a crop plot to convert it into a herb plot.
Caveats:
These potions only work on plots you own, i.e. those in your back yard. Public plots don't have the "Convert" option enabled. (You don't own this plot!)
Good or obsolete idea?