How to Create Mulch from Leaves. Part of the series: In & Out of the Garden. Shredding leaves to create nutrient-rich mulch can be easily done by filling a trashcan one-third of the way with raked leaves and using a string trimmer to chop them up. Create airy mulch from fallen leaves with tips from an organic gardener in this free video on healthy gardens. Read more: http://www.ehow.com/video_5926935_cre...