The flowers of most herbs are healthy to eat. Most flowers that are edible are overlooked by most. Certain flowers are a great source of vitamins and minerals. There is dandelion wine, herbal vinegars and herbal oils that are made from flowers. Some of the larger blooms of yellow squash and zucchini can be stuffed and fried.
Many people put edible flowers in their punch bowl ice rings.
They usually do not eat the flowers. Just as we usually do not eat the parsley on our plate. We usually just think of these things as ornamental and not edible. Many flowers contain phytochemicals that we need to fight off disease. I would not recommend eating the flowers or wild plants from the roadside.