Tu Bi’shvat =tree planting= the best way to show that Hashem gave US Israel.  (trees show ownership over the land). And who planted trees and settled the land? Chalutzim.

To familiarise chanichim with the Torah resposibility for caring for the land

To familiarise tha chanichim with the activities of the JNF, The Jewish Agency and the State of Israel with nature conservation

Teach the chanachim about chalutzim and how they helped towards establishing eretz yisrael.

To understand what was so special about Ilan Ramon