Widely accepted definition of native plant & sustainability

[Fearless Weeder]

http://www.fs.fed.us/wildflowers/nativeplantmaterials/documents/FSM_2070.pdf

Native plants are the indigenous terrestrial and aquatic species that have evolved and occur naturally in a particular region, ecosystem, and habitat.

US Forest Service People's Glossary of Ecomanagement Terms- sustainability

The ability of an ecosystem to maintain ecological processes and functions, biological diversity, and productivity over time.

The above definitions are widely accepted.