Last year, I grew Okinawan Sweet Potatoes both in a Raised Bed (see this blog entry) and in a container (see this blog entry).
I found that I got just as much yield from the container as I did from a Raised Bed, but it was so much easier to harvest the Okinawan Sweet Potatoes in the container. It would take me a over an hour to dig up the Raised Bed and find all of the Okinawan Sweet Potatoes. With the container, all I had to do was to dump the container onto some newspapers and the Okinawan Sweet Potatoes would just appear. No digging. No hunting.
This year, I decided to just grow the Okinawan Sweet Potatoes in containers. I reused the fiberglass half-whiskey barrel container from last year and I bought 6 more containers. I got 10 pounds of Okinawan Sweet Potatoes in the container last year, so I hope to get 70 pounds this year.
Okinawan Sweet Potatoes take about 6 months to mature. I started these plants in April and March (see this blog entry). I had wanted to start the plants earlier, but the cool weather we had at the beginning of the yield prevented my cuttings from taking root.