Is grass not one of the crops on purpose, or is that an oversight?
There are a couple grass fields with nice textures, but it's not on the crop calendar and not an available crop in seeders.
Viewing post in FS25 Ashton Corners Public Beta comments
While I don't want to speak for MRG, I poked through the files, and he does have grass in there, however, it is called 'alfalfa' in the grass xml, which is why it shows up on the calendar as 2 alfalfas. So I assume it was an oversight. I changed that variable in the xml from 'alfalfa' to 'grass' and it shows up in the calendar correctly.