I grew Memorial Day (3) in my zone 6b garden In the same bed were planted New Zealand (3), Gemini (3), Double Delight (3) MAAB(3) and Belami (3). Belami, MAAB, and Double Delight died of blackspot before the first fall. Gemini and New Zealand were removed at the end of the second season because they were being reduced to nothing by the same disease. Memorial Day was symptom-free the whole time. It was also the least cold hardy of these roses: I lost one of three over the first winter.

I must say that I was impressed by the plant: it was vigorous and shrubby, and clad with very dark green and disease-free leaves. But the flowers always seemed a little plain to me. The dusky pink of the petals is not a color that appeals to me much. They aren't that long, by HT standards. And there is precious little of the reflexing petal thing going on that I think defines the classic HT form. It's definitional not for arbitrary reasons but for aesthetic ones. A hybrid tea rose with a petal that doesn't curl just a bit is really more of a shrub rose, IMO.

While it is marginally cold hardy to zone 6b in the east, I lost one here in zone 7b AZ mountains. Not completely sure whether it was spring freeze/thaw cycling or lack of water. Two years later the rootstock is seven feet tall and awaiting budding to serve as a tree rose. Many roses I feel sad to lose. This one, not so much.