Invasive Trees and Plants in Guam: Identification, Impacts & Native Replacement Guide

Invasive Trees and Plants That Grow in Guam

Guam’s limestone and coastal forests are highly vulnerable to invasive trees that outcompete indigenous species such as ifit (Intsia bijuga).

Key Invasive Trees (Examples)

• Tangan-tangan (Leucaena leucocephala) – Forms dense stands that displace native understory.
• Albizia (Albizia lebbeck) – Fast-growing canopy tree that alters soil nitrogen and storm resilience.

Native Replacement Guide

• Ifit (Intsia bijuga)
• Yoga’ (Elaeocarpus joga)
• Nunu (Morinda citrifolia)

Pacific Islands Cluster

• Hawaiʻi
• American Samoa
• CNMI