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This is typical of hollyhocks as they suffer badly from rust disease. You need to spray with a fungicide early in the season. Rust is unsightly but does not seem to stop the plant from flowering and returning year after year. I believe you can now buy some rust resistant varieties. I just cut off any leaves with rust, and as they mostly appear near the bottom of the stem, you can plant something in front of it so you don't see any grotty leaves
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