We knew that violets were edible, pansies and violas as well. We grow nasturtiums because their flowers and leaves are tasty. Dandelions greens are good, the flowers can be eaten as well.
Although Doris Day says “Please don’t eat the daisies,” the petals of the English daisy (Bellis perennis) in fact are edible.
Calendula, carnation and chamomile all go into our salad bowl, along with chives and cornflower.
You can find a good list of edible flowers here as well as some important cautions. Go ahead – eat the [English] daisies!