[ddsack]

I am up north, and I have fused blossoms early in the season when temps tend cooler, and the plants are young. Not too many once past mid-summer. Varies greatly by variety. My gut feeling is that they are caused by the young plants ramping up their growth once they hit fertile soil, and maybe they produce more energy than can be used in a balanced growth of roots and foliage, so perhaps the excess goes to unusually large or fused blossoms. As the season progresses, the plant learns to adjust to conditions or better coordinate uptake of it's needs. Just my personal take on it.