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jmattson 
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i've grown this for two summers in minnesota in a shady spot. sets hips and is very hardy.
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Extremely black spot resistant in my test garden.
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'Graham Thomas' has certainly been a productive parent. I notice MR is being grown in two zone 5a gardens and sold by Rosarium in Spokane, WA. I wonder if this might be a good alternative for those of us who can't grow GT?
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#2 of 9 posted
26 AUG 23 by
Ericchn
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Star roses and plants is listing the hardness zone of MR as USDA 5-9 so I think it’s worth a try. But for me it doesn’t look like Graham Thomas so much, the plant is more like a very big traditional hybrid tea rose, even the flower color is a bit different from that of GT.
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I know I can't have the real GT, alas, but this one in photos looked like a similar growth habit and flower shape.
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#4 of 9 posted
27 AUG 23 by
Lee H.
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Are you saying that GST is too tender for your area?
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I live in upstate NY, along the Mohawk River, so in a frost pocket. A number of borderline tender roses have not survived the winter for me, despite being covered. I tried 'Sunflare' twice, alas, as it is a favorite of mine.
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#6 of 9 posted
27 AUG 23 by
Lee H.
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That’s discouraging. I love mine. Have you tried growing it own root? In my own experiences with zone pushing, an own-root rose may be killed to the ground, but often still come back in the spring. That’s not usually the case grafted.
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I have several own root roses which do come back, as you say, but they don't grow very much during the rainy summers. I am keeping them because they are extremely rare, and I am still trying to figure out how to propagate roses in my climate without having to buy an expensive misting system.
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Have you tried Mike Shoup's ziplock bag technique? This is a variant of it (replace dot with .)
heritagerosesdotorgdotau/articles/rose-propagation-ziplock-bag-technique/
Mike recommends about equal amounts of potting soil and aerator, eg perlite - I don't use any aerator but our potting mix here must be very different from what he uses.
It needs about 6 weeks of warm weather - might be borderline late for you this season.
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this rose, now in october, is between 6-7' feet tall in its bed at the lyndale park rose garden in minneapolis, mn in z4/5. looks to be healthy, with a very upright growth pattern. i would say it has good cold hardiness judging from the size and vigor of these bushes.
to me as well, it looks more like a hybrid tea than a graham thomas, which i have in my garden.
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about 6 feet high with about 5-6 canes after two summers in the ground in minneapolis z4/5. absolutely no fungal issues. took a lot of sawfly damage at the beginning of the season but most of the plant leafed out after that. healthy, vigorous, very nice flowers. i am thinking that i might have crowded it a bit with roses on either side.
umbra can be pegged down to get lateral shoots quite easily, and might do it on its own if the cane grows too fast.
i would heartily recommend this after having it come through one winter with heavy snow and cold, and one very dry winter with no snow cover.
did not set hips despite my attempts to pollinate. i could not gather any pollen off of the flowers either. i will continue to try in the years to come.
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i grow james galway in the twin cities (z4/5) and i would say there is ample anecdotal evidence posted online that it is hardier than zone 6b, including on the david austin website which rates it to zone 4.
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What is your opinion of JG? Do you recommend it for cold climate gardens? Can it tolerate heavy soil?
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it's hard for me to say as i've only had it one year. the first year it was vigorous and flowered all season, throwing canes up to about two feet. it's near a waterspout and did get some blackspot during a period of heavy rain. i'll report back as it grows in the next several years. anecdotally, there are many posts online attesting that it does well in z5, and some nice pics of bigger plants.
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#3 of 4 posted
9 FEB by
Le_Not
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I can attest that it handles Zone 5b winters well enough that it is a true climber here -- unlike many of the other Austin "climbers" that will only get big enough to be shrubs in this climate. Our soil is fairly heavy clay-loam, and James seems to manage that just fine.
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a great rose after this season. flowered many times, no blackspot, grew to about 4 feet. if it remains winter hardy i can recommend it for cold zones.
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