That's very interesting info, mikischo. Explains why my one solitary Shasta daisy has been one solitary Shasta daisy for years. Obviously the true sterile type.
That photo of the drift of daisies in the sunlight under the silver birches is a beauty, Hazel. I think you are all just so lucky to have summers where everything is lush and green or flowering, because here it is just bone dry with that terrible risk of bushfires all the time.