1. Alpert P (this issue) The advantage and disadvantage of being introduced
2. Ding JQ, Reardon R, Wu Y, Zheng H and Fu WD (this issue) Biological control of invasive plants through collaboration between China and the United States of America: a perspective.
3. Ehrenfeld J (this issue) Potential novel source of information for screening and monitoring the impacts of exotic plants on ecosystems.
4. Gu B (this issue) Environmental conditions and phosphorus removal in Florida lakes and wetlands inhabited by Hydrilla verticillata (Royle): implications for invasive species management.