potatoes are a curse, the only possible upside I can think of to them is that as you pick them up it puts one more in your inventory, so in theory (though I have not tested this) if your inventory was full you’d start dropping them, and they’d basically plant themselves as soon as you pick one up (because you’re also dropping one of the ones you picked up)
the pain of having to drop them all later wouldn’t make up for this so I just avoid them now, the idea of self-planting might be worth testing for someone else but I’d rather plant carrots 🙂