He's right,they could overwinter,you'd want to be sure the area drained well,but with them already being in pots could just move the pot. I started a seed
last year was suppose to be soloman colored.was near end of season.so the pot actually went through a winter-sowing stage.It came through.it had already started to form its tuber that fall.With your shorter season your tubers would bloom slower versis doing the seeds
yearly as an annual.you could wintersow your seeds
.I have them mass planted in areas throughout the yard,so no tuber or seed
shortage here.I have fushia,pink,dirty pink,yellow& white.I also got a white with pink speckles& a yellow with pink splashes.