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I have grown them in the past in a large pot (but then, I grow nearly everything n pots so that doesn't say much really!), I used a mixture of JI2 and general purpose compost, gave them a reasonaby sheltered spot, they do come from the tropics, and they flowered fine for me. If you did chose to do them in a pot, you may be able to keep them over for a second year, but I did not take mine inside so they did not survive. Lots of very pretty papery petalled flowers, varied colours - nice.
I've never kept the tubers, they're so quick and easy from seed and produce plenty of seeds so I keep them going like that. Less trouble to store seeds than tubers. Sorry Swedboy, not answered your question on when to plant. I'd get them planted, if a frost is forecast you can always cover them with some newspaper, there won't be a long penetrating frost now.