Peonies available from mid July until the end of September are considered out-of-season peonies since they become unavailable in most parts of the world where they are harvested. Wholeblossoms Peonies at this time of the year are bigger in size than Peonies harvested during other seasons. Buy Whole Blossoms wholesale peonies to design wedding bouquets, floral arrangements, and to give as a gift during this time of the year!