You can grow sweet potatoes in pots. Yes you can !!!
Here is a picture of my 2 kg sweet potato from my garden pot to proof it.
It all started out as a lonely sweet potato with an “imperfection” .......... that started to grow in a margarine container in my kitchen. Soon I had a sweet potato with lovely leaves so I planted it out in a pot in my garden. Gave it lots of water, and that’s really all I did. Try it !!!