Free images results:

Roots pictures, stock photos and images


Tree Trunks Stock Images
Author: Lydia
Hyacinth Royalty Free Stock Photos
Author: Rbouwman

Also, here are some commercial RF-licensed images that match your search criteria:  
Roots Stock Image
Author: Antares614

Explore more commercial options: More Roots Stock Illustrations & Vectors | More Roots Stock Video Footage