Wow, Anne. I got to check out Dorothy Perkins, a fantastic once-bloomer that occasionally has a tiny bit of rebloom and is zone appropriate 4b and upward. The once-bloomer Turner's Crimson was also very lively. These must be great weepers/standards, I love their photos on HMF. Unfortunately I didn't know at the time that my hybrid tea tree roses I chose were actually zone 7b and they had fragile genes as well. But the great thing was that they bloomed like crazy no matter the condition of their foliage. I think the major difference is that the Burlington tree roses spend the winter in the greenhouse where there is light and warmth and can be carried back & forth. Mine stayed in the dungeon of my garage with no light and they were not carried back and forth if we ever got a warmer break in the weather. Not that this would have helped that much because our winter remained record-breaking cold anyway. But even a little bit of light and fresh air in February through March might have helped the tree roses a lot! Instead I waited until it was "safe" to bring them out. But I also think that non-stop rains are detrimental to my tree roses. The canker always starts right at the bud-union and spreads upwards on the stem or simultaneously down to the bud union and it always occurs when we get slammed with flooding rainstorms. This drives me crazy! If the canker had started on the upper portion of the stems, it would be a piece of cake to solve (you can easily prune and cut). But invading the bud union from the get-go is absolutely maddening! Next year when I restart my tree roses I will definitely carry them in and out of the garage more frequently and I will also start my severe pruning in winter instead of waiting until Spring. Veilchen, I checked David Austin's tree roses but the only ones they had were Austins and not the Old Garden Roses. Maybe one of these days David Austin will carry them perhaps? that would be nice.

And yes calliope, non-native bugs, blights, fungi and diseases have wreaked havoc on many of our natives once they got imported here. Those were unfortunately a by-product of bringing plant material from other places; the chestnut blight, for example, came in on an Asian chestnut stock that was brought over as a new landscape plant. Their ability to eat and affect the American cousins of their host plant was unfortunate. This is what I am getting at, not only can alien insects thrive on our native trees, our native insects can thrive on alien trees. It works both ways. I'm in your camp actually about introduced species, but pandora's box is already open now. Yes, yes, yes there are overused non-native trees and many of them are weeds when they reach our shores. I live near a city where urban planting is rife with bradford pear they replace and replace as they die. Burning bushes run ramplant through the landscapes from escape from gardens. We absolutely need to rethink it and I support that movement. But it lacks credibility when it's applied too broadly to an either/or choice.

trees do NOT... can NOT.. invade modern chemically welded PVC pipes ... they can very easily do so .. in old fashioned sewer lines.. like at the link if yours were dug out... as you state.. i cant believe they do not modernize the pipe system ... perhaps you should be asking that contractor his opinion??? a very simple primer on tree roots... some say.. a root mass can be 2 or 3 times the size.. of what you see above ... but do NOT confuse yourself into thinking is is in the same shape ... most are pancake flat.. and only a few feet down in the soil [unless there is a leaking fertilizer source down there.. like a sewer pipe] .. see pic below on the root mass of a silver maple .. unless i forget .. lol .. almost all of its roots are there... in the space my ball cap took ... and the large ones going deep ... were headed towards a septic field... go figure on that ... i dont know either of your trees.. but had green and white ash.. both tended toward surface roots ... which was a big problem for me .... i wnated them deeper ... ken Here is a link that might be useful: link

toronado, let me be clear. After 12 years, no more FULL DOSE treatment will be required. And your State Agricultural department should advise citizens when that time has come locally. Since in some area's it might be 10, and others 14 years. After that point, sporadic low dose treatments will continue to be required, to make sure local populations of EAB are truly wiped out. But also know, presently this is only theory about how long low dose applications will still be required. Now if one planted new ash tree or no longer treated theirs after that 12 year stage, scientifically there will no longer be enough of an EAB population to critically damage unprotected trees. And healthy Ash can easily repair any damage caused by low populations of borers. But if EAB does have just enough untreated or no longer treated trees locally, it could take a decade or more for EAB populations to possibly reach "Infestation" levels again. By utilizing limited food supply, compared to beginning of event when borers have almost endless supply of unprotected trees to "Exponentially" build numbers with. To "Responsibly" prevent this, all local ash tree owners would need to low dose their Ash once, every four or five years for at least one decade. Since any remaining EAB locally would have no choice but to feed on remaining treated trees, which has proven to kill them off. With a list of all remaining Ash tree locations, a local municipality could assure local EAB populations are kept in check by coordinating this process. Even inexpensively contracting to have all remaining public and private trees retreated during same year, twice a decade. Remember, EAB is causing "Functional extinction" of its only remaining live food source. Plus we have better EAB detection traps now, which could keep an eye on local populations. Even if someone was to bring EAB back to your town. So far borers kill off all wild sapling Ash trees before they reach species seeding age. Which is 10 for Green, and age 20 for White Ash. And those few wild Ash found surviving EAB attack, cannot be utilized by borers to survive on. Also any "Lingering" ash that do survive borer attack while every tree around them dies off. Inevitably succumb to borers as well. And by collecting enough wild locally evolved seeds before forests completely succumbs to EAB, there is good possibility that someday in future. Conservationists can use seeds to bring back 4 or more wild Ash species. Or even possibility that nurseries can once again begin selling Ash trees that are not crossbred for resistance against borers. For example, we can again plant Elms because they have been cultivated for resistance against Dutch Elm Disease. But fact is, cultivars will never grow up to look like unique locally evolved organisms enjoyed before DED arrived to America. And scientists cannot utilize cultivars to repopulate wild forests. Plus for native Elm, they will need to be continually retreated for rest of their lives. Since DED fungus will always exist locally, by utilizing continuous supply of new trees, which are only threatened after age 25-45. For Elm, their is always hope that mother nature will evolve a cure someday against DED naturally. But Roman Empire began loosing Elms to DED way back in year 300, and European wild Elms have yet to evolve a resistance. We now know that EAB arrived to America way back in early 1990's, and it took them time to build to tree killing populations. The first person that began successfully treating trees against EAB, was Wayne White back in 2001. One year before Asian borers were even officially identified. Since he could see that a type of "Phloem/ bark borer were cause of tree damage, he realized we already had successful Systemic product for Bronze Birch borers. As a Michigan Arborist who had been continually retreating trees for 12 years, he was one of first able to determine that Full dose treatment was no longer needed. And that it was now possible for tree owners to treat the trees themselves by applying sporadic low dose applications. Also, the whole idea of importing and locally releasing Asian bugs known to feed on EAB. Was to keep borer populations in check or to eradicate what remained, only after peak event. Plus we now know there are several native bugs that kill EAB, like Smoky banded wasp. Along with Woodpeckers. So all I can say presently toronado, is stay tuned. Once borers wipe out every Ash tree in America from Canada down to Panama, it will be more difficult to reintroduce EAB locally by transporting infested firewood. (Fresno is Ash in Spanish)