rose mallow leaves
The leaves on my rose mallow turn yellowish brown and shrivel up every year. The flowers don't seem to be bothered. What could be causing the leaf damage? I see no pests.
Certified GKH Gardening Expert
This could be a disease called hollyhock rust. Please see these articles for more information:
If it's not that, some other possibilities are discussed in this article:
Plants in the hibiscus family, like rose mallow, often develop yellow leaves. They tend to be sensitive to the problems discussed in the above article.