I have purchased a SHOW GIRL rose in a 1 gal  container. It was in a group of hardy roses good for zone 3. The only information on the container label "Fragrant, excellent form, strong stemmed, upright, extremely vigorous". Information on the internet indicates that it will grow 15 ft but gives no more information. Is it hardy toto zone 3? If not how do I winterize it for zone 3?

Ron Harvey, Didsbury, Albeta, Canada. ronmarharvey@shaw.ca