The Tu B'Shevat seder is a celebration of our relationship with nature and with fruit trees in particular, and a time for reflection. Today, as we celebrate together, let us envision ourselves as partners in shaping, cultivating, and healing the natural world. The Tu B'Shevat Seder is split into four sections, each reflecting the seasons and symbolizing different aspects of the trees and our own lives. Each section is connected to one of the four worlds of Kabbalah, Jewish mysticism, and represents the transition from the most physical to the most spiritual. 
Service Section: Psalms, Poetry & Songs 
Source: PJ Library