Contact CTAHR Scientists

Lantana escaped onto Kahoolawe

Lantana is a popular ornamental plant which has escaped home backyards and is spreading quickly into Hawaii's natural areas. Here it is growing on Kaho'olawe.

Photos: Forest and Kim Starr

Weed Control information for Homeowners

CTAHR Publications

Before you buy or apply an herbicide . . .

Organic Weed Control for the Home Garden

Woody plant control for the home, pasture, and forest

Weeds of Hawaii’s Pastures and Natural Areas: Available for sale from CTAHR, this book includes photographs to help homeowners quickly identify weedy trees, shrubs, vines, herbs and grasses found in Hawaii. Individual fact sheets from the publication are found under Weeds of Hawaii at this website.

Urban Garden Centers

The Pearl City Urban Garden Center offers gardening classes on various gardening topics of interest at a minimal cost. Call the Urban Garden Center office to find out more information (808) 453-6050.

What is a Master Gardener?

The University of Hawaii Cooperative Extension sponsors the Master Gardener Program. Volunteers are trained to solve gardening problems and give research-based advice to the public through the Master Gardener Plant Helpline, plant diagnostic clinics, presentations on gardening to local groups, and maintaining demonstration gardens at the Urban Garden Center. Our volunteers are trained to help people learn to garden more productively.

For information on the University of Hawaii Master Gardener Programs statewide see:


Hawaii (East) Master Gardeners

Hawaii (West) Master Gardeners
Ty McDonald, (808) 322-4892,

Kauai Master Gardeners

Maui Master Gardeners

Oahu Master Gardeners

Alternatives to Invasives

The majority of the invasive plants found in Hawaii were brought here as ornamental species. Don't plant a pest!

Suggested alternatives to using invasive plants

Lantana camera