Calendula and Nasturtium varieties will often be listed in the flower sections of seed catalogs.
Below are some of the edible blooms I'm growing in my garden.
I've planted three lavender plants in my herb garden. Lavender can be dried easily and used in teas, dessert, sachets and balms.
Calendula petals are edible and medicinal. The flowers turn to seed fairly quickly, but at the stage shown in the picture they can be harvested by snipping them off the plant at just above the first set of leaves. The petal pull away from the center easily and are ready to use in salads. They also can be used in recipes for lotions and balms.
Nasturtiums are one of my favorite herbs because it's easy to sow and grow. Cherry rose, below, is a lovely variety.