Only real roses are suitable for consumption
First of all, there are many beautiful flowers that have been named "rose". However, they are not actually real roses in all cases! Only wild and cultivated roses of the genus Rosa belong to the real and therefore edible roses; all others are usually only called that, although they are not roses in the true sense of the word. Peonies (Paeonia), peasant or hollyhocks (Alcea rosea) or Christmas or snow roses (Helleborus niger) may have rose-like flowers, but belong to completely different types of plants and are usually even poisonous.
In addition, purchased potted roses or rose bouquets are by no means suitable for consumption, as these plants have been massively treated with toxic pesticides.