how does one create dry grass (and while we at it: dry soil)?
i accidentally cobbled the entrance area and it looks like shit... wanna revert it.
would be great if there was an actual wiki for the game with such infos.

while we are talking about the fact that you can cobble the the outer areas of the garden which at the right spot can affect the garden entrance OUTSIDE the garden:
you can also shovel it to flood the entrance:

that also lets u look under the map outside your garden:

and yes after cobbling u can also hoe it. u cant hoe untouched outer areas.

Ah shoot sorry about that, these are the issues which can happen since I unlocked the cursor from the camera, an unintended affect was that players are able to work outside of their own garden, even on the surrounding tiles which are just very large tiles that surround the map.

I'll definitely be fixing those errors, not allowing players to work outside of their garden in the next update. I'll also include an option to fix the surrounding tiles when I do

maybe some players like to change their entrances. who knows. is kinda funny at least. could sell it as a feature: "You can now customize your garden entrance".
but the flooding to look under the map definitely needs to be fixed.

but back to my question: how DO you make a tile dry grass or dry soil? there are biomes that need those after all: ignoring wasteland there's still Marsh, Wetlands and Prairie. havent seen a monster that wants those biomes yet. but havent encountered all monsters yet either. and who knows what will be added or changed later. 

I've uploaded a patch that should allow you to fix this through the pause menu, under Garden fixes, if you click Restore garden border the surrounding tiles will be returned to their original state.

Right now there is currently no way to make a tile into Dry Grass or Dry Soil, just as you've stated they're kind of just placeholder materials for later versions when I add some Monsters that prefer those biomes. I'm sure I'll add some kind of Decor item which can convert surrounding tiles, or something along those lines.