I planted some "hardy" hybrid roses last winter, which did pretty well till recently. They're supposed to be one of the more problem-free varieties.
Recently, however, they've developed a yellowing of the leaves & black spot ... probably as a result of the crazy weather lately - very dry, followed by deluges of rain, over & over ... followed by more of the same.
I've removed many of the offending leaves over the past couple of months, but the problem appears to be getting worse. Two of the bushes now have almost no leaves left.
It's winter here & pruning time is soon. I'm wondering what to do: Do my roses sound seriously ill? Should I replace them or give them a good prune? And is there anything I can do about this situation that doesn't involve nasty poisonous sprays?
Any advice from "rose experts" would be most welcome.