Happy Tu B’Shvat from Israel #TuBshvat is the Jewish “New Year of the trees”. On Tu B’Shvat we plant trees for future generations. Tu is the number 15 in the biblical numbering system (which uses the letters of the Hebrew Alphabet). B’ is Hebrew for “in”. Shvat is the current month on the Hebrew calendar. So Tu B’Shvat simply means the “15th of Shvat”.
Source: Erez Vansover