Answer: If the leaves are yellow but not spotted, it could be due to heat stress, water stress, or simply the natural shedding of older leaves. As long as the new growth is green and healthy, I'd chalk it up to heat stress or natural aging of the leaves. If the new growth is also affected, root stress from over watering or a need for nutrients is the more likely cause. Hope this information helps you determine just what is going on with your rose.
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