Which varieties with fused blossoms? I can't make a list but almost exclusively large pink fruited PL varieties and always on initial blossoms, the next flush of blossoms, rarely.
Carolyn, who had no use for the large monster fruits that were malformed to an extreme so removed those fused blossoms ASAP, much to the chagrin I'm sure of Marv Meissner who wrote the book on how to grow big ones and is still a friend.
Carolyn