2. Do not assume that restaurants and caterers always know which flowers are edible. Just because it is on your plate does not mean it is edible (see Rule #1).
3. Eat only those flowers that have been grown organically.
4. Do not eat flowers from florists, nurseries, garden centers or public gardens (see Rule #3).
5. Do not eat flowers if you have hay fever, asthma or allergies.
6. Do not eat flowers picked from the side of heavily trafficked roads.
7. Eat only the petals of flowers; always remove and discard the pistils and stamens before eating. (Except for the tiny flowers like thyme where it would be like performing microsurgery to remove the pistils and stamens.)
8. Not all sweet-smelling flowers are edible; some are poisonous.
9. Eat only the flowers of the recommended plants; other parts may be toxic or inedible, even though the flower may be delicious.
10. Gradually introduce flowers into your diet – one at a time and in small quantities, the way you would new food to a baby.
Source: Organic To Be