Q.what causes rust spots on hollyhocks
What causes rust spots on hollyhock?
Nikki
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on May 1, 2012
This is called rust and is caused by a fungus. The following article should be of some help: https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm
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