It’s difficult to diagnose what may be ailing your roses just by photo alone. However, most rose problems occur because one or more rose growing requirements needs attention. Here are some suggestions and a link to the Oklahoma Extension Agency for more rose growing information – http://pods.dasnr.okstate.edu/docushare/dsweb/Get/Document-1077/HLA-6403web.pdf
The yellow leaf color suggests that your rose needs nitrogen or is being overwatered. All roses require regular fertilization for proper growth. Refer to the Extension Agency fact sheet for fertilization recommendations. Roses don’t like to dry out and need consistent moisture. If the soil is consistently soggy or smells, however, it may be receiving too much water. Also, it’s unlikely the coneflower is having any affect on your rose.
We suggest going through the Extension Agency guide to see what rose care basics may be missing or need to altered.
Kudos to you for caring about your roses!
My rose has tiny leaves and doesn’t look like a rose at all two separate roses ate the same both new last season help what can I do