What’s the Difference Between Fibrous Roots and Buttress Roots?
Fibrous roots absorb water and nutrients. Buttress roots anchor the tree.
What’s Actually Happening
Fibrous roots:
- Grow outward in search of water and nutrients
- Are typically found in the top 30–45 cm of soil
- Often extend 1.5× or more beyond the canopy widthButtress roots:
- Thicken and enlarge near the base of the trunk
- Grow outward and downward
- Provide structural anchorage
Fibrous roots support health. Buttress roots support stability.
How to Handle It
Avoid:
- Compaction over the root zone
- Cutting structural roots without evaluation
- Changing grade around the trunk
Understanding root types helps explain both health and stability concerns.
Bottom Line
Most roots feed the tree. The largest roots anchor it