The Hawai‘i-Pacific Weed Risk Assessment (HPWRA) is a free service that provides a background check on plants. Professional botanists use published information to answer 49 questions about a plant, to predict whether it is a low-risk or high-risk of becoming invasive in Hawai‘i or similar Pacific islands. The HPWRA is more than 90% accurate in identifying invasive plants. For History and More.

The HPWRA can be a valuable tool for assisting with import and planting decisions to reduce invasive plant problems. However, the HPWRA score should not be used as primary justification for removing trees or other established plants from urban landscapes, nor should it be interpreted to mean, "Do not plant under any circumstance." To request that a plant be assessed using the HPWRA, please request a free assessment by clicking here. To ask questions about the HPWRA or a plant's score, contact us.

It is not shade tolerant nor does it form dense thickets. Widely planted; not invasive elsewhere. Requires a specialist pollinator and lacks natural vegetative spread.

Has thick growth and is shade tolerant. It's invasive outside of its native range (Tahiti). Prolific seed production (greater than 9 million per year) and is spread by birds and people.