Except in winter, there's a 1% chance of the fairy event being chosen. If it's not raining, the event chooses 100 random terrain features; at least one of those must be a crop that's not from [[Crafting#Seeds|Wild Seeds]] and not fully-grown. If it's raining or no crop was found, the event does nothing.
The crop fairy fully grows all crops in a 5x5 area around the selected crop, so they're ready to harvest. Although the center crop can't be from [[Crafting#Seeds|Wild Seeds]], one of the surrounding crops can be; in that case, they'll all produce the same item chosen at random.
[[File:fairy.png|thumb|none|The crop fairy visiting at night.]]
[[File:fairy.png|thumb|none|The crop fairy visiting at night.]]