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Hibiscus yellowing leaves

I have two hardy hibiscus plants in planters. They are on my patio in approximately the same location and get plenty of sun and are watered equally. However, one plant's leaves has started turning yellow within the last week. It still blooms profusely and would hate to lose it. What can I do? Shouls I remove the yellow leaves?
Submitted by BHGPhotoContest

Hardy hibiscus or Rose of Sharon are usually good candidates for containers. however they do need regular and deep watering. Although you have treated each the same, I suspect that at one time the yellowing one actually dried out before you noticed it. The yellowing leaves will drop on their own and as long as it looks healthy otherwise, don't worry. You don't say if you are feeding these plants at all. I would add liquid fish emulsion at half strength every week or so to their watering regime until the end of the summer to build up the plants. Be sure to follow the instructions on the package.

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You are watering the plant too much if leaves turn yellow. Plant needs drainage.
Submitted by pcschigg