Tu B'shevat

Tu B'Shevat 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'Shevat, 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 reason for the festive mood of the Rosh Hashanah of trees is that the 15th of Shevat recalls the praise of the Land of Israel, for on this day the strength of the soil of the land is renewed. With reference to the fruits of the trees and the produce of the soil, the Torah praises the Land of Israel: “A land of wheat and barley and vines and fig trees and pomegranates, a land of olive trees and honey” (Devarim 8)

 Shivat Haminim poster

A beautifully designed  poster which features colored pictures of the Shivat
Haminim along with their Hebrew names. Use to decorate for Tu b'Shevat, when learning Parshas Eikev or when doing a unit on Eretz Yisrael. 
From Chinuch.org