A rotary tiller has the ability to cut through some roots. The amount will depend on the blade size and tiller depth and root type, size and depth. Larger roots may cause the tiller to jump, according to the LSU Extension, which is a dangerous situation.
About the Author
Hepzibah Flurge has been writing professionally since 2008. She is a horticulturist and her work appears on various websites and assorted gardening blogs. She holds a Bachelor of Science in horticulture.