Yellowing leaves may be due to drought or soggy wet conditions that exclude oxygen from the roots. They may also be a sign of leaf diseases if there are also brown spots on the leaves. These diseases can be controlled by a fungicide. Your Home Depot garden center folks can direct you to one for roses. Finally, the plant may be needed nitrogen. Try giving it a boost with a liquid product such as Miracle Gro to give it renewed vigor again.
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