There are different reasons why the leaves may be yellowing on your rosebush, many times it is either due to over watering or can be a very natural thing as the rosebush grows new foliage that shadows some old foliage that then is allowed to die back and fall off. Check out this article link on this subject as well: https://www.gardeningknowhow.com/ornamental/flowers/roses/yellowing-rose-leaves.htm
Answered on August 7, 2016
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