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.
Rose Mallow Leaves
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.