Hollyhocks with rust.
We have two hollyhocks that were attacked by some kind of fungus, that just distroyed the leaves. I read that this stuff was called rust, and that it would be a good idea to cut the plants down to the ground, bag them, or burn them. I did the cutting, and bagged them, and the bags were taken away. Now I see that in just a matter of weeks the plants are coming back. The leaves look healthy, and beautiful. What should I do to keep the rust from takeing hold again?