regardless of what the stats say on the soil maps, Strawbs, I can definately say my soil is alkaline - not as much as yours but rhodies and azaleas are a distant memory from my northern childhood - our black silty fen soil is top class for cabbages, celery and onions and sugar beet. Anyhow, unfortunately, I am not much of a guide to soil ph and roses since this is an issue which rarely comes up - at least not as much as mildew, rust or blackspot. The only dodgy roses (chlorotic, needing regular sequestrene) I grow have had too close a brush with rugosas - and one of my only Austins, Wild Edric is definately a pale and pasty specimen....although Compte de Champagne comes awfully close and I couldn't say what its parentage is. Annoying, as the rugosas are generally happy with well drained, sandy soil (I am on calcareous grassland. Of course, I do not have the extremes of temperature that you have so I have been able to adopt a blase attitude to ph as it is practically impossible to actually kill a rose here. Nonetheless, not dying is emphatically not the same as thriving - there are roses which are doing considerably better than others. I did expect china roses would be a bit feeble but have surprised me with their general willingness to grow and bloom - Sophie's Perpetual, Mutabilis and Sanguinea have been stars. Even more surprising, the infamous bourbons do well for me too. I would have to say that the majority of my roses are species or close hybrids although I have a weakness for Harkness floribundas. I am incredibly fortunate in that Beales and Trevor White (2 out of 3 old rose growers in the UK) along with Harkness and Legrice are based in East Anglia with similar soil and climate conditions as myself....and fervently believe that this conflation of conditions has a whopping bearing on the subsequent health of the rose once it is planted in my garden so I think you are right, Strawbs, in pondering specific nursery circumstances before considering buying from them.

it funny you should ask because I`m looking for the same thing and I live in a similiar climate. Evergreens are more difficult in my area now due to the government reintroducing deer. They can completely anniliate young evergreens. I have totally given up on white pines for that simple reason. White cedar aren`t tolerant of my regions drought. I like bald cypress, pond cypress,and dawn redwood. So far I haven`t had much luck with larches, but I`m not one to give up. Loblolly pine does pretty well. It tolerates extremely dry soils, wet ones and even the ones where no other pine here will live because of poor clay soil. There are better pines for less troublesome sites. It also has some problems with insects. I`m getting ready to post on just where I can locate just a few. So far all I have found is where I have to buy a thousand. Where they are native they aren`t sold much anymore due to insect problems. Maybe the problems aren`t as severe here. In an extremely cold winter they do suffer from wind-burn in my region but they always seem to recover.

Just thought I'd post the results I had in one garden bed that's clay-loam. Last year I had amended this bed with home-made compost. Everything did well last year as first year plantings. This year they suffered from too little light. (I just put the roses there to get them through the winter and hoping they might like the eastern exposure. Heathcliff, Sugar Moon and Falstaff like sun in my neck of the woods, it seems. I'll probably be moving the viking Queen next Spring as she's a fraction of the size of her sister in full sun, and hasn't bloomed since Spring while her sister would be non-stop if not for the midge.) Anyway, the soil was very dry even with rain. I thought the heavy leaf layer prevented water. I stuffed the empty holes with alfalfa hay, compost and leaf mold until I decided what to plant. I also put the alfalfa under the leaves in the rest of the bed and gave it additional compost. Wow, when I went to plant Lavender Lassie and two hydrangeas, all the soil was so soft and fluffy and moist, even though we had less rain that earlier. I'm now prepping my holes in advance of next Spring and filling them with the same and covering the entire bed with alfalfa hay, etc. The new plantings have taken off even in the reduced light of late summer. I repeated this in another new bed and Mme Alfred Carriere and Awakening seem to love it even in their NE exposure. (Of course, they could just be responding to being in the ground vs. in pots. : ) ) Lesson learned. : ) I'm also trying gypsum on some new beds I'm prepping since they're on an incline. I'll report back.

Kordes Flower Carpet survived my zone 5a winter better than Knock-out. Zero diseases for the past 16 years. Didn't fertilize nor water it for over a decade. Peggy Rockefeller Rose Garden in NY rated the top 115 no-spray & disease-resistant roses by score. Quietness came 3nd place, after Belinda's Dream at 8.6. Quietness got the second best score of 8.55, higher than single-Knock-out at 8. Julia Child gets a score of 8.3. Austin Heritage gets a score of 8.8. Alkaline clay folks complained that Heritage is stingy, due less acid-phosphatase. Roots secrete acid to utilize phosphorus in soil for blooming. Too much of that ends up with fungal diseases. http://www.nybg.org/gardens/rose-garden-top-performers-2010.php If you click on the link above, it ranked the most disease & no-spray roses by a score. Knock-out scores at 8, while many Kordes roses are at 8.3 and above. Kordes roses have vigorous root system, mean better winter-survival and perfect foliage. HybridizerVariety (Sorted Alphabetically)Overall ScoreAlexander Hill GrayAlister Stella Gray7.75LimAll the Rage8.15KordesAmadeus®7.90MeillandApricot Drift®8.10BayseBelinda's Dream8.60PriorBetty Prior8.15UnknownBlush Noisette8.00RadlerBlushing Knock Out®8.10MeillandBolero™ 20048.50MeillandBonica™®8.00ClarkBorderer7.75LensBouquet Parfait®7.91BedardCape Diamond®7.85KordesCaramella®7.85AustinCarding Mill®8.50BuckCarefree Beauty™8.25MeillandCarefree Delight™7.75RadlerCarefree Spirit™7.95LimCentennial7.85MeillandCherry Parfait™8.50KordesCinderella Fairy Tale8.50MeillandColette™8.00MeillandCoral Drift™8.40KordesCream Veranda8.75FoundDarlow's Enigma9.00LimDaydream7.90KordesDesmond Tutu8.25RadlerDouble Knock Out®9.10DucherDucher8.25BernèdeDuchesse de Brabant8.25MeillandEaster Basket™9.25HarknessEasy Does It™7.85KordesEiffel Tower8.25KordesEliza®8.00KordesEscimo™8.00MeillandEternal Flame™8.40ShoupF.J. Lindheimer8.40KordesFelicitas8.00KordesFloral Fairy Tale8.00LesterFrancis E. Lester8.00KordesGardening Joy8.25KordesGebrϋder Grimm® (Brothers Grimm)8.50KordesGolden Fairy Tale™8.00AustinHeritage®8.80CarruthHome Run™8.10KordesJasmina®8.35WilliamsJoe Grey™8.10CarruthJulia Child™8.35KordesKarl Ploberger7.85RadlerKnock Out®8.00KordesKordes Golden Gate™8.00KordesKordes Moonlight®8.75KordesKosmos9.00BarbierLa Marne8.15KordesLa Perla8.00NoackLady Elsie May™8.00ShoupLady Pamela Carol8.00KordesLaguna®8.30KordesLarissa8.50ZuzekLena7.90KordesLions-Rose®7.60KordesLupo®8.00LimMacy's Pride8.95DesprezMarchesa Boccella8.25SportMarie Daly7.85AlégatièreMarie Pavié7.85KordesMarie-Luise Marjan®8.40CarruthMemorial Day™8.25DelbardMichel Bras8.25MeillandMother of Pearl™8.70UnknownMutabilis8.25LimMy Girl7.85PissardNastarana7.85ShoupOld Baylor8.45ZuzekOle7.85MeillandOso Easy Cherry Pie8.50WarnerOso Easy Fragrant Spreader8.00MeillandPeach Drift®9.00FoundPeggy Martin 'Survivor'8.75RadlerPink Double Knock Out®9.00MeillandPink Drift®8.75CarruthPink Home Run®7.15RadlerPink Knock Out®8.10MeillandPink Traviata™8.40KordesPlanten un Blomen8.40KordesPomponella™8.00LensPorcelaine de Chine8.00PembertonProsperity7.50KordesPurple Rain8.65BuckQuietness8.55RadlerRainbow Knock Out®8.00ShoupRepublic of Texas8.00KordesRosanna®7.85KordesRosarium Uetersen®8.05UnknownRose de Rescht7.25KordesRoxy™8.50HolmesSally Holmes®8.45BarniSans Souci7.85AustinScepter'd Isle7.80KordesSolero™7.80AustinSophy's Rose8.75AustinSpirit of Freedom8.75LeeStanwell Perpetual7.85BarniStile '800®8.20KordesSummer Memories™8.00KordesSummerSun8.00RadlerSunny Knock Out®8.50MeillandSweet Drift®8.00MeillandTequila™7.90DemitsThe Gift7.95BugnetThérèse Bugnet8.15MeillandTraviata™8.65RadlerWhite Out®8.65RadlerWinner's Circle™7.90KordesZadie8.10 Below is my Kordes FlowerCarpet, pic. taken late August. I didn't fertilizer nor water it for over a decade .. actually did better that way: