New Zealand Landcare Trust

New Zealand Trust for Conservation Volunteers

Queen Elizabeth II National Trust

Kaipatiki Project

World Wide Fund for Nature

Forest and Bird

Landcare Research

NIWA aquatic plant management

Gardening New Zealand

Action-BioCommunity

New Zealand Plant Protection Society

The Weed Free Waitakere Trust

CRC for Australian Weed Management

Weeds Australia

Aquatic, Wetland and Invasive Plant Glossary - from the University of Florida

The Hawaiian Ecosystems at Risk web site

TNC Wildland Weeds Management & Research:
The Nature Conservancy's U.S. program for dealing with harmful invasive plant species threatening wild land biodiversity and invading TNC preserves. Site has weed alerts and resources on weed control.