Quick tip! If you get a bone from a skeleton or something, you can craft it into bone meal. Using the bone meal on the ground has a chance to grow a sapling! I had to add that feature not too long ago because I realized some worlds could possibly generated without trees. Hope that helps!
 "Dead Zed 2"){kind=icon}
 "Dawn of the Dragons"){kind=icon}
 "Red Crucible: Firestorm"){kind=icon}
 "Mine Blocks"){kind=icon}
 "Galaxy Online"){kind=icon}
Quick tip! If you get a bone from a skeleton or something, you can craft it into bone meal. Using the bone meal on the ground has a chance to grow a sapling! I had to add that feature not too long ago because I realized some worlds could possibly generated without trees. Hope that helps!