The rose petals won't be as bitter as your dandelions, but every variety does taste different. Some I think are not tasty and some are really worthwhile. I wonder what your dandelions were like when they were growing. There is such a difference in what makes a good-eating dandelion for the greens, and what will be just terrible. And there is a trick for processing some of the big dandelion leaves that make them good, even raw. Maybe I should make some posts about dandelions. They can be such a good food! I eat a lot of wild dandelions, lol.