I live in Chicago and I have 2 pots with roses in them. They're hearty Canadian strains that actually survive through the winter. They both started up fine this year, but suddenly one pot is having problems. The stems are wilting and the leaves are yellowing. The other plant in the pot is a candy corn climbing vine, and it doesn't look as bad, but the tips of the leaves are drying out and turning black. I have the exact same setup in a pot that's 2 feet from this one, and the roses and vine are doing fine. What's wrong?
I posted pictures here: https://jubrand.imgur.com/