I planted the jasminum officinale in zone 6b right up next to the south side of my brick house. At one point I didn't think that is was going to make it. There was quite a bit of tips that froze. It has come back nicely this spring. I haven't had the pleasure of any flowers from it yet. I only had 3 days this past winter under 10 degrees, the low for me this winter was 3 degrees.

great..... does it flower all summer or only in April?

It's flowering right now, for a few weeks only.