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My recently planted Hollyhocks are growing well, about 3ft high. Have just discovered bronze, light coppery flecks. I suspect rust. Looking closer is it magnesium deficiency? Can you please advise. Help very much appreciated. Thanks,
Gaynor.
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Reply from
Hi, Gaynor,
Looks like rust to me. Best thing to do is cut it back this autumn and destroy all the leaves - don't compost them because this can help spread the disease. In spring, you can apply a fungicide on new leaves to prevent rust from coming back.
Kathy C
Reply from
Thanks for the info Kathy C.