Here are sources for a shiur on the cusoms of Tu Bishvat and their sources:
– Why do some people not say tahanun on Tu Bishvat?
– Why do some people eat fruits on Tu Bishvat?
– Why do some people have a Tu Bishvat seder?
– Why do some people plant trees on Tu Bishvat?
Sources of Tu Bishvat minhagim
al capone bemidbar biodiversity death ecology emily dickinson emor Evolution fats waller Limmud mashiach messiah parsha rosh hashana sacrifices science unetane tokef yom kippur