One aspen tree grew up to 130 feet tall with a diameter of three and a half feet, and other trees had a diameter of four feet! Wow! That's about as big as a 4th grader! The aspen leaves, when they fall, kill the grass. You can see why you don't see aspen trees everywhere. They're too powerful!!!! One place the aspen tree does live is the boreal forest a.k.a. the Taiga. To find out more about the aspen tree check out