I've tried Knock-out roses, but they have not all been equal to the heat. Some are marginal but do bloom nicely with the temperature eases off. I have some red Knock-outs that are in the ground and don't care about the heat and almost never get watered and grow and bloom very well. I have an antique rose that was given to me, variety unknown, and it shrugs off the heat and blooms.
If you can work out a place for them to grow up a support, Lady Banks grow and bloom enthusiastically in the heat and just need some help with water in the very worst drought. I haven't tried them in containers, but I think they would do alright with some kind of creative support.
I don't give any of these even the slightest care, and I've never seen a hint of disease. None of them are very fragrant, though.
