I have found 3 or 4 small plants that have escaped. All of them were found very close to the corrals and put back in. There has been no signs of rogue colonies however.
The WH can be wintered indoors, but most say that success is low unless you can really supply good conditions (better than my dark basement). It's not as easy as wintering bulbs and for 20$, I will just buy some to start it off again next year and avoid the cost, time, and electricity for light that's involved with setting up the indoor green house.
