Thanks for the comment about pear and for the Toronto comment about
Hopa crabapple.

I found out some relevant information today that sheds much light on
the metabolism of trees, or at least the genetics of trees. The
owner-planter of this hopa crabapple said that this tree acted
similarly in previous years. A year in which the Spring frosts did not
allow the tree to bloom or killed off the blooms. However, the tree
somehow remembers where it could not bloom in spring and reserved that
coding in its genetics such that as Autumn comes around with a tiny
cold snap and then a warming up releases those remaining codes of the
Spring-blooms to bloom.

So I think what happens is that a tree has a genetic coding to bloom in
Spring but if the Spring cold prevents the tree from blooming, the tree
still saves that coding and by Autumn if a cold duration followed by a
warming up releases that harbored coding of last Spring.

If that is true then there is a practical way of getting fresh apples
in winter if we plant a apple tree inside a huge tub of dirt that can
be wheeled inside a greenhouse or a greenhouse wheeled over a apple
tree and kept warm during winter. Of course the economics of keeping an
apple tree warm probably outweighs the benefit of fresh apples in
winter.

Archimedes Plutonium
www.iw.net/~a_plutonium
whole entire Universe is just one big atom
where dots of the electron-dot-cloud are galaxies