what makes my roses leaves turn yellow? they are not diseased with black spot, mildew or rust

what makes my roses leaves turn yellow? they are not diseased with black spot, mildew or rust
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Answer :

One of two reasons.   The roses are getting too much water and the soil they are in, sounds like it's not draining.  I had that problem in my rose garden.  So I dug up all the plants, put gravel down, a layer of mulch then finally added some good rich soil.  Now I can't keep up with harvesting beautiful roses for bouquets.  It was alot of work but well worth it.  I hope I helped you.
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