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malcolm_manners started a discussion: refrigerating antique roses?
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malcolm_manners
Thanks mad_gallica.
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stillanntn6b
I won several National Dowager Queens with R. moschata. The key was to keep the plants happy and producing new canes all summer long.
See if you can find any papers written by Dr. Henry Najat who had a huge collection of OGRs (I think he lived in Wisconsin ). I looked him up and I did remember that he passed in 2022. Maybe there's a archive for that part of the world of roses?
Define 'hardy'.
About 30 years ago, someone sent me a rooted cutting. For all I know, it is still out there, though I don't think I've seen it in the last five years. It has produced a flower or two along the way. I think it may have been a foot tall once,
So if by 'hardy' you mean does not die, 5b is perfectly reasonable. If by 'hardy' you mean becomes a reasonble specimen, its a lot warmer than here.
Malcolm, I'm 7b, so normally much warmer than your area, but Maggie has come through a couple of abnormal winters, i.e., sub-zero Arctic Express winters with days of relentless dry winds. Maggie shrugged it off, very hardy for a (possible) bengale/china (or is she a bourbon?). I can't say she'd endure a full winter of that stuff, but she doesn't mind the occasional dip below 0.