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I live in a low lying open/rural zone 5 and many roses die back to the ground and while some bounce back many don't so after raising many roses in every category for over 20 years I am leaning more and more towards the care free and "cane hardy" (canes don't die back during the winter) roses like Rugosas, Canadian Explorers, Mordens and Old Garden Roses that are known to be cane hardy like Albas and so on. I have one David Austin English Rose that is very vigorous (gets big!)and cane hardy with no protection..."Constance Spry" and I highly recommend her.
If roses are once bloomers and die back to the ground or snow line during the winter you won't have any or very few blossoms since they bloom on the wood grown the previous year. I have also found that using an anti-transpirant like Wilt Pruf helps alot too and if a rose is tender wrapping it in burlap will help as well. I was able to get a Z6 rated rose through last winter by doing this. Its canes where green to the tips and it got a head start on my other roses.
Its important to spray WP in the late Fall before the temps fall below 40º and if you get a mid winter thaw a second application is needed since it won't last all winter. You can apply WP to other ornamentals and evergreens as well. I find this a useful product because dehydration is a major killer of over wintering plants so make sure to keep your plants well watered up until the time the ground freezes.
I also use WP during the Spring - Summer on transplants.
Would love to hear from other folks growing roses in cold zones.
"Constance Spry"
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