A Kid's Heart: Resources for Kids and their Teachers | Bible | Holidays 
Holidays: Days Celebrated by Y'shua (Jesus): Tu B'Shevat
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Kid's Heart Christian Games, Printable Resources, and Activities
Tu B'Shevat - The New Year for Trees
And when you shall come into the land, and shall have planted all manner of trees for food, then you shall count the fruit thereof as uncircumcised: three years shall it be as uncircumcised unto you: it shall not be eaten of. But in the fourth year all the fruit thereof shall be holy to praise the Lord with. And in the fifth year shall you eat of the fruit thereof, that it may yield unto you the increase thereof: I am the Lord your God. ~Leviticus 19:23-25
Tu B'Shevat is the 15th day of the Jewish month, Shevat. It is the "birthday" for trees, and has become a Jewish Arbor day. God commanded the Israelites in Leviticus 19 not to eat of the fruit of the trees for the first three years after it is planted.
During the fourth year, the fruit belongs to God. The fruit may be eaten in the fifth year.
It is customary to plant trees on this day, as the ages of trees are calculated from the 15th of Shevat.
Some Resources and Activities for Tu B'Shevat:
A coloring page of children planting a tree.
Another coloring and information page about Tu B'Shevat.
He who has an ear, let him hear what the Spirit says unto the churches;
To him who overcomes will I give to eat of the tree of life,
which is in the midst of the paradise of God. ~Revelation 2:7