If you can't find one it probably just uses the basegame one. Change the file path in the map.xml to wherever you copy the basegame one to the map folder, do that, then add alfalfa to that.
The way alfalfa is set up is set up as grass so you don’t have to worry about it atm in the future once I update some things I’ll be changing it to be its own and it’ll be add to the xml
