I just checked my home garden, and I found prolifs on:
Wilson Spider (made them last year too)
Roswitha (made them last year too)
Loth Lorien
Margo Reed Indeed
Jerry's Whirligig
Orion's Band
and on a dip seedling from: unknown x Seriously Purple.
I will check the DL's in my veggie garden and on my allotment tomorrow
All my prolifs are still on the plants as most still have buds/are blooming/are forming pods..
My Winter was mild and wet, my Spring cool and wet and the Summer is turning out quite nice (not too hot and enough rain), so I don't think making prolifs has anything to do with 'survival' in my case.
Mayo