Here in northwestern Minnesota, Zone 3, Sunrise Sunset has shown itself to be a standout performer. Late in the summer, when very few roses are showing much color, SS is often smothered in blooms. It has a great low growing habit and does not send up any asymmetric 'water sprouts' like many roses do later in the summer. I have lost one to winter kill, but I have a row of them in an exposed location that has done well for at least three years. If planted very deep they should be ok in zone 3. They are getting some leaf disease, but have not defoliated and still look good in September. For hybridizers, this rose is not very fertile, but will set hips. The pollen has set on other roses, but the take percentage is lower and the hips are smaller than usual. I have not yet germinated any seedlings of this rose.