What's up with that? I've got new blossoms on an Empire, that I grafted this year, and a Nova Spy, that's about 5 years old. I've never seen apples do this before.
I had it happen a few years ago with some trees we had a frost that wiped out almost all the blooms on a couple of my trees and they rebloomed latter in the season it was odd for sure.
Stresses such as drought, which causes growth to stop and start, can confuse woody perennials and cause out of sync bloom.
www.canr.msu.edu
Not quite the same thing, but one of my lilacs just bloomed a week or two ago. I think if the plants enter some kind of dormancy from drought or other stress they will switch back into reproductive mode.
I have a ditch apple that drops apples and leaves fairly early. Several times in the last 20 yrs if we get a week long spell of Indian summer in late Oct or first week of Nov it puts out some blossoms on branches. This would be after having some hard frosts and of course days are shorter. The daylight and temps can feel out of season almost like spring
The Anna apple in my backyard blooms every September and October in south Mississippi. Annas drop their apples in June. I am not sure why it blooms later in the year. A couple of years it has produced dime sized apples in November. The picture below is from mid October.
I have a 1 year old liberty that has a blossom or two. Overall, that particular tree wants to grow fast. Got a more mild mannered liberty next to it from same source and rootstock.