I remember my grandma teaching me this, we did this with willow trees as well as other plants. She was always taking clippings from friends and neighbors. Here's an interesting fact. Pando (Trembling Giant) is a grove of aspen trees in Fishlake National Forest, but it isn't just a colony of several trees but a single organism with a root structure that is thought to be 80,000 years old. It is considered to be the heaviest and possibly oldest living thing.