Here in the Pacific Northwest U.S. The wet cooler climate doesn’t seem to bother my plums at all, in fact they do great. I do compost around them heavily, it’s supposed to help them get through the cold winter. Now peaches are another story, they get leaf curl a lot. Once in awhile I have a really great year with them, so I keep trying. I read epsom salt (which is not really salt) helps them alot. I use Sea/90, which is sea solids. While there is sea salt in, it’s also full of trace minerals.