Do we rend clothing for jerusalem on tu bishvat
Yes we do. In fact, according to some poskim we even rip on Rosh Chodesh, which is a day that we don’t say Lamnatzeiach. Definitely on a day like Tu B’shvat that we do say it., even though it is aday that we don’t say tachanun.
Orchos Rabeinu 2 pg. 149, Piskei Teshuvos 561-3.