I planted some hollyhocks last year but they turned yellow after they got about a foot high and I thought they all died. This year one came back, but it's starting to do the same thing. Help!!!
Certified GKH Gardening Expert
Hollyhocks are prone to powdery mildew and other fungus. Treat them with a fungicide. This should help prevent the yellowing on the leaves.
As a precaution, I would also check watering for the plants. If they are not getting enough water, this can also cause yellowing.