Hey Becky, it has sure been a long time since I have posted here.
I just wanted to share with you this amazing portulaca that has come back the last 5 years from it's roots. The roots are under the edge of a large container, evidently that provides enough protection. It has gone through weather as low as 6°F and no snow cover.
It doesn't reappear until some time in July, and am I ever happy to see it again.
I did not know they could do this.