I have knock-out roses that I planted last summer. I live in NJ. It was a pretty frigid winter and I did not cover them. Their canes started to green in early spring then quickly started browning/blackening down to the rootball. The canes that are pictured are not new growth. The rootball does not feel mushy. I initially in early spring... cut some of the necrotic canes but all seem to have become necrotic now. Are these done for? I bought an insect/fungicide/feeding mix at home depot recommended by someone... and a spray fungicide because I thought maybe it was rose canker. Sorry for repeat pictures.
Any help/thoughts would be greatly, greatly appreciated. So disheartened.
