1) Throw it away

2) Compost it

3) Bury it.

I chose option 3.

I dug a hole, threw the potato in and have watered it deeply every few days.

Turns out, I did it all wrong. You’re actually supposed to plant the slips (or appendages). You cut them off of the sweet potato, and bury them with the part that was closest to the sweet potato down (that part grows the roots). I planted mine in hard ground. It likes a big mound of loose compost or dirt.

That said, it looks like in about 100 days  I still might have some sweet potatoes:

Or maybe it’s poison ivy…