This problem could be caused by thrips, or rose midges, which are tiny insects on roses that suck the juices from the plant. Observe your roses, and you might see some. If this is your problem, then an insectiside (preferably an eco-friendly one!) could solve it. However, also make sure that your roses are getting enough water. If you don’t water your roses enough, or if your environment is too dry, they’ll be dehydrated, and get brown edges.
It may also be heat stress, or being watered from above. It’s a very common symptom in many rose ailments.
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