This Morning Glory (Ipomoea purpurea) pops up EVERYWHERE in my garden each year. I'm not complaining!
I bought some Zebrina Hollyhocks (Malva sylvestris) at a garden show about five winters ago. Each year since, they have re-seeded themselves. I took these photos a few days ago. They were about five feet tall. I have since then cut them down to about six inches. Hollyhock gets rust, caused by the fungus, Puccinia malvacearum. This form of hollyhock, for me, gets it the worst. I find that if I cut them back after their first big flush of bloom, while they are still healthy, I don't have to fight the rust as badly. By the time they are ready for re-bloom they have nice clean fresh foliage!