Grow them in your garden—eat them in your salad
Edible flowers add a special touch to salads. Once the salad has been tossed with dressing, pick off petals from edible flowers and toss them on top. Many flowers have a strong flavor, so use a light hand when adding them to your greens.
Nasturtium
Available in a scope of colors. Both flowers and leaves add a peppery flavor to mixed greens. 
Calendula
A prolific grower, calendula blossoms grow in abundance. Sprinkle individual petals lightly on a salad. 
Herb Flowers
Basil, chives, dill, fennel, and arugula flowers all add a spark of aromatic flavor and a burst of color to salads. 
Read more: http://www.organicgardening.com/learn-and-grow/best-edible-flowers
