Edible flowers are flowers that can be eaten. Edible flowers may be preserved for future use using techniques such as drying, freezing or steeping in oil. They can be used in drinks, jellies, salads, soups, syrups and main dishes. Flower-flavored oils and vinegars are made by steeping edible flower petals in these liquids. Candied flowers are crystallized using egg white and sugar (as a preservative).
Some flowers are toxic; others may be edible only after appropriate preparations. Toxic flowers may be misidentified as edible when gathered. Allergic reactions are possible, especially from eating pollen. Both gathered flowers and those from a commercial grower may have been sprayed with toxic pesticides. Damaged, dirty or insect-ridden flowers may be unsafe to eat. Some flowers are not safe if eaten often.
Source : http://en.wikipedia.org/wiki/Edible_flowers
See Also : Flowers, Florist, Florists