The 15th day of the month of Shvat marks the beginning of the "new year" for trees.The funny thing is that instead of eating "fruits of the land of Israel to mark the occasion", many will bless on dried figs from Turkey or apricots from California, וּכְדַי בִּזָּיוֹן וָקָצֶף.
Tu B'Shvat is the new year for the purpose of calculating the age of trees for tithing. The Torah states that fruit from trees which were grown in the land of Israel may not be eaten during the first three years; the fourth year's fruit is for G-d, and after that, the fruit can be eaten. Each tree is considered to have aged one year as of Tu B'Shvat, no matter when in the year it was planted.
It is customary to plant trees and partake of the fruits of the land of Israel to mark the occasion.
The good news is that Kommemiut and Otzar HaAretz have are marketing a plate of Tu Bishvat fruits that are from the Land of Israel. I picked one up today. Here's a pic of the plate in my shopping cart, full of veggies from Otzar HaAretz: