I have 3 Rose of Sharons and in this past week the leaves of two of the plants adjacent to each other have turned a bright yellow all over the plant. The other one on the other side remains green and pretty. I am not overwatering them because for the most part they get water once a week if they are lucky. Is this a disease, fungus, insects? I don’t want to lose them. I see no insects or chew damage.

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