I have a pot with hostas in it which forget-me-nots seed themselves into (as well as pretty much everywhere else). I do try to remember to pull them out when the hosta starts growing, which is well before they're over but I do get some flowers.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Probably best to grow something near the edge of the pot where there's likely to be more root space. If you want colour now and over winter, winter pansies or violas will do the trick! They tend to fade by early spring and can easily be removed.
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