-- the actual lib
dofile( minetest.get_modpath("trees_lib").."/trees_lib.lua")
-- some examples as to how tree growing functions can be implemented
dofile( minetest.get_modpath("trees_lib").."/trees_lib_growing_functions.lua")
-- as the name says: an example tree; just for documentation
dofile( minetest.get_modpath("trees_lib").."/example_tree.lua")