I live near Detroit MI, in Ontario. I'm in zone 5. This is the second year my Plumbago has bloomed. I bring it in in October, and last year kept it under grow lights, where it bloomed again in winter. It is very easy to grow in a pot, in full sun. Water to keep it from drying out. It seeded itself and I harvested a new plant in the pot, but am not sure how.
Common name: Plumbago, Cape Leadwort
Plant Link: http://plantsdatabase.com/go/414/