Honeysuckle

I love honeysuckles, but I'm not very good with them. I have four, and only one has flowered. The others all have powdery mildew, and it seems to be hanging around year on year, despite my attempts to tidy/clean up and prune back. Two are in fairly shallow containers in a sheltered spot, and I suspect that doesn't help. Thankfully the sweet peas don't seem to mind.