Miche Bacher, author of "Cooking with Flowers, recommends the following sources for fresh, organic, edible flowers:
Koppert Cress, Cutchogue (631-734-8500), usa.koppertcress.com: It stocks nasturtiums and pansies year-round. Call ahead to place an order. In warmer months, there is a farm stand at the front entrance.
Marx Foods, marxfoods.com
Gourmet Sweet Botanicals Store, gourmetsweetbotanicals.com
Sur La Table, surlatable.com: Sells a nice variety of candied, crystallized flowers.