[Avodah] Tu?bishvat is the Rosh Hashanah (new year) for trees. What does this mean?

[Zev Sero]

As a matter of metzius, are there any fruits that, in Eretz Yisrael's 
climate, reach onas hama'asros by the middle of Shevat, so that a hard 
date is required to separate them?

I would have thought the logical place to separate the years would be in 
mid-winter when there are no fruit growing anyway, so that it doesn't 
matter whether the exact date is the 1st or the 15th.  Or is that 
actually the general case, and the exact date only matters in a freak 
occurrence?


-- 
Zev Sero            Wishing everyone a *healthy* and happy 5781
zev at sero.name       "May this year and its curses end
                      May a new year and its blessings begin"