Answer #1 for the People of Chelm and Any Other Curious Souls
Per the
advice of Hillel, the festival of Tu B'shevat was fixed as the day of the full
moon of Shevat, the fifteenth day of the month. It was celebrated in the time of
Hillel, almost two thousand years ago, but then ignored for many centuries. The
holiday was revived in Israel in the early 1900s when Jews began repopulating
the land. Deuteronomy 8:7-8 emphasizes the connection with the land when Moses
speaks of "a land with streams and springs and fountains issuing from plain and
hill; a land of wheat and barley, of vines, figs, and pomegranates, a land of
olive trees and honey...". These are the
seven species, all were found in Israel more than three thousand years ago.
Corn, lemon trees, apples, and tomatoes may grow there today but do not have
the distinction of being mentioned in the "seven species" passage of
Deuteronomy. There is a growing tradition of a Tu B'shevat seder, where the
table is set with these diverse agricultural products of Israel. Incidentally,
both corn (maize) and tomatoes are New World plants, although the term "corn" was commonly applied to the principal grain of a country in the centuries
before the discovery of the Americas. Thus Biblical references to corn actually
refer to barley.