Managing Invasive Ficus Roots: Protecting Foundations and Walkways

The Problem: Ficus Roots Damaging Concrete

A homeowner (Maryana) reported that her outdoor Ficus benjamina (weeping fig) had cracked concrete walkways and posed a threat to house foundations. She sought advice on mitigating the damage.

Expert Advice: Removal and Root Management

Darlene, the responding expert, confirmed that Ficus benjamina is notoriously invasive when planted near structures. Her recommendations:

1. Cut down the tree – the most effective way to stop further root expansion.
2. Treat regrowth with herbicide – apply Roundup (glyphosate) to any sprouts emerging from remaining roots.
3. Replant at a safe distance – if a ficus is desired, plant it at least 30 feet from concrete or buildings.
4. Consult a local nursery – for alternative, less invasive tree species suited to the area.

Follow-Up: Will Cutting Roots Cause Regrowth?

Maryana asked if cutting roots on the damaged side would make them grow back. Darlene explained that ficus roots are aggressive: cutting one root often stimulates two or three new ones. Reducing watering slows root growth, but vigilance is required. The best long-term solution remains removal and replacement with a suitable species.

Key Takeaway

Ficus benjamina is a beautiful but high-risk tree for urban landscapes. Proactive removal and careful species selection prevent costly structural damage.