David Austin’s actually do very well in heat. There is a David Austin rose farm here in central arizona, and there is another in Texas that distribute across the US. I have 8 that have done very well in my garden and have several more new ones I am getting ready to plant this fall. That all being said, Munstead Wood was a VERY slow grower for me. Now almost a full 2 years in my garden he has started to take off and grow more and is putting out blooms pretty consistently. He seems to follow the sleep, creep, leap growth progress. I purchased directly from the DA website as an own root.