As titled. Right now, making pots of dirt is--weirdly--a DC 19 item. Why is it more difficult to put dirt in a bottle than it is to cook an edible lobster bisque (DC 18) or to make gravity-defying potions (potion of featherfall, DC 15)?
The recipe is currently 2 Coal, 4 Clay, and 4 Amethyst Dust to make 5 Pots of Dirt at DC 19 and 8 CP. I suggest to reduce the DC considerably, and--as a compromise--consider adding a requirement of 5 Glass Vials to the recipe to store your beloved dirt in.