Q.hollyhock leaves have reddish brown lumps underside and they melt away.
what is it and how do I treat the plant?

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on July 12, 2020
It sounds like you have some kind of leaf gall on your plant. Here's an article that should help: https://www.gardeningknowhow.com/plant-problems/environmental/treating-leaf-gall-on-plants.htm
The Missouri Botanical Garden's educational website also offers information on how to identify and treat the problem http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/diseases/rusts/rust-of-hollyhock.aspx
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