On Bamidbar 13:20 “whether there are trees or not”, the Chiddushei HaRim says that the “trees” refer to the Eitz HaChaim- the tree of life.
Moshe Rabbeinu send out the meraglim to “feel” if the environment of Eretz Yisrael was enriched by Torah.
The Gemara in Bava Basra says that the air in Eretz Yisroel makes a person wise. The Sfas Emes however, in parashas Shelach, says that the wisdom of Torah in the air of Eretz Yisroel was temporarly concealed because the Canaanites still lived in the land. The wisdom in the air had a “husk” on it.
So why would the meraglim need to feel if the Torah was in the environment of the land of Israel and if they felt the wisdom of Torah in the air?