I planted this a number of years ago, and was sure it disappeared soon after. Surprisingly, it has survived and lives in the shade and moisture under a Camellia bush. The blue-violet flowers grow on stalks that emanate away from the balloon plant, thus they appear to be growing in the leaves of nearby winter-blooming violets.
Violets grow profusely under the camellia bush, making it hard to see any other plants that might also be growing there. Besides the balloon flower, I am now discovering various other plants popping up under the camellia including a bergenia and bluebells. I know I have not planted the latter two in that area, so I am thinking the mice (or voles) have been moving bulbs and parts of plants around in the winter time. I had heard that this could happen, and now I am observing plants in places that I have no other explanation for their location.