Shizen is a Blender addon that provides a library of realistic, optimized trees for your scenes. It includes over sixty individual tree models across nineteen different species, each fully textured and designed to maintain a low polygon count. Users can insert a tree directly into the center of their scene using a dedicated keyboard shortcut and selecting from the built-in list. The included species range from common varieties like oaks, maples, and birches to specific types such as bamboos, cactus, and date palms, with each species typically offering three distinct variations.