S-ranked crops?

[Tardisapron]

I've been wondering, how do you produce S ranked crops? Do you get them after only gaining a certain farmer degree level or by following growing instructions exactly?

[Cherry Blossom]

It's sort of...random, I guess?

I dunno.
Usually, leaving crops in the same space, once they're ready for harvesting, for a few days makes the crops S-ranked.

[VanillaTwirl]

me i do is when the crop is fully grown i just let them stay there i dont pick them up then until the day that the crop die, i do is i load the game then before the day that the crop die i pick them up then i see that the crop is S ranked..