Hi Steve, I know much of this is a non issue for you where you live, but just sharing information with you about the potential suitability of some of the roses you listed from your stable for the Californian marketâŚ
Augustine Guinoisseau - thin, easily damaged petals; mildew and black spot susceptibility.
Blue Girl - Blue Moon - love them both, grew both for many years. Week seedlings with higher propensities for black spot here and thin, easily burned petals.
Crepuscule - love it, grew it for years. Mildew and thin, easily burned petals.
French Lace - beautiful and very popular, and rusts as badly as any Austin containing Ferdinand Conrad Meyer. -
Green Ice - fun, pretty mini, grew it for years. Sterility issues.
Green China Rose Bush - still grow it as I like it. Sterile and mildew.
Grey Pearl - have grown it since the early 80s. Horrible plant in virtually every way. Weak, bad architecture, low disease resistance in seedlings. I love the color, form and âchallengeâ of making it happy enough to live and not flower itself to death. Personally, I will never breed with it. Excellent resistance to mildew out in the open. Under plastic, very susceptible here. Never rusts and the only black spot is on old foliage from last year which has refused to fall off. Gene Boerner introduced it in the US market at the end of WWII, writing that âif someone was willing to pay $3500 for Grey Pearl shirt studs from Tiffanyâs, surely they would pay $2.25 to grow it in their gardens.â It didnât last very long in the J&P catalog, proving much too high maintenance to continue offering. Only Roses of Yesterday and Today offered it for several decades, spending much of the catalog space reserved for it apologizing for not being able to supply the plants. Definitely âone for the connoisseursâ, a real âmuseum pieceâ. Actually, probably worse for breeding anything worthwhile today than using Angel Farce, which is actually an easier plant to keep alive and entice decent flowers from.
Heirloom - delivers many âold fashionedâ, muddy, reddish mauve seedlings with higher than acceptable black spot and rust susceptibility in these parts.
Intermezzo - significantly superior to Grey Pearl as a plant, but also producing weak, diseased offspring with poor architecture.
Memorial Day - I havenât raised many seedlings from it, but definitely one of the better, fragrant pink HTs in the inland areas here.
New Zealand - pretty, fragrant and refuses to flower at all when it gets HOT here.
Perfect Moment - I grew this before it was introduced. I agree with Mr. Kordes, âthere is ONE perfect momentâŚâ However, it is as fleeting as ice in Death Valley, leaving you to deal with an intensely thorny, mildewy mess. Had it not been for other family members insisting that one, fleeting perfect moment was worth the wait and garden space, it would have been out of here before it did the only honorable thing and died.
Pristine - hard to find around here these days, probably due to the intense amount of sharp, strong prickles and chronic rust.
Queen Elizabeth - legendary for its ability to grow (even heavily virused), flower and rust anywhere a plant can be expected to grow. My youngest sister has three mountains of it in her Newhall garden which are over forty years old, inherited with the purchase of their house. With aridity, it is amazing. The two thirty-five plus year old bushes of it in this garden are amazing in their tenacity and enormity, even with rust. Definitely one you can pollinate with dirt, particularly if you desire raising enormous, vigorous, dirty, rusty seedlings. Excellent where itâs excellent. The mow/blow/goers here buy it because it is the largest canned, flowering rose with the biggest pink flowers they can find at Home Depot.
Rio Samba - another âperfect momentâ situation. When in flower, it will sell all day long, only to be dumped and replaced with a new one once the flowers fall and the plant falls apart from every fungal issue known to man. Not vigorous and susceptible to all fungi in my experience. âPretty when itâs prettyâ.
Smokey - another wonderful color I grew for many years, until I tired of the terrible foliage in this climate. It has a bit longer âperfect momentâ, but definitely not one I would breed with for this climate.
Stainless Steel - the all round best âgrayâ rose for arid climates, IMHO, elsewhere here, the poster child for black spot.
Sweet Surrender - Iâve loved the flower since the first time I saw and smelled it nearly forty years ago. Just wish it could hold its head up straight. Many foliage issues in many of the Southern California areas, requiring regular spraying. Honestly superceded here by its 'spiritual successor", Memorial Day. Iâm still drawn to it every time I encounter its flat-topped, intensely fragrant, ânoddingâ blooms.
Yves Piaget - the first year, introductory plant of this I grew years ago, refused to grow. The many-year-old one in a clientâs garden is a horse. Very angular, odd growth, mildews and the flowers ball in cooler, damper weather, but always in flower in her hotter, more arid garden, with massive, peony-like, fragrant flowers. Iâm not sure if I would consider breeding with it or not, but absolutely better as an old, established plant than any newly planted one Iâve ever seen.
Granted, the fungal issues are likely very climate specific, but inherent vigor, longevity and architecture arenât. And, itâs your choice what appeals to you to use, but if you have any aspirations of creating something possibly more widely suited than just your area, these may serve you best by being reevaluated.