@Roseseek, thanks. I might try those things.
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Julie, I created a small garden of OGRās several years ago, and even though I donāt use them a great deal for breeding, I really think of the Graham Stuart Thomas compilation āRose Bookā as my go-to for information on the old cultivars. It was very helpful.
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@lee_hull, thanks, I eventually managed to read a bit of that book in a readable form, went away and it had gone and needed to renew it, which was again getting the wait sign interminably. It did look like a wonderful book and I am considering buying it, though the only copy currently on Amazon UK costs Ā£35.
I agree, BN is an excellent OGR according to my observation with all traits you mentioned (despite it is not immune to blackspot). In addition, BN is very heat tolerate, the flowers it produced under the temperature more than 35ā is almost identical to ones in spring (neither evidently smaller nor distorted) . But what puzzled me is that most Tea-Noisettes derived from BN are large climbers, so is it possible to create something short (like dwarf Polyanthas) using BN?
Louis XIV might be the worst OGR I seen and I would neither rate its disease resistance as āmoderateā nor worry about mildew. It is just a blackspot magnet. I NEVER find it with flowers (and leaves) in the rose garden (zone 9a). I donāt think it is worth to use anyway, just an awful stuff.
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While āBlush Noisetteā isnāt exactly a dwarf, its offspring seem capable of varying widely in habit according to the backgrounds of their other parents. Karl Kingās āSweetimeā (from a cross with āPopcornā) is a good example on the small side of the spectrum. BN has also been speculated to be a parent of āMarie Pavieā. Crossing with teas, considering their R. gigantea-heavy background, is probably the reason for the vigorous climbing behavior of many tea-Noisettes. They are certainly a different breed from the original, small-flowered Noisettes.
Stefan
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Thanks. I would discover more on this line.