Post-fire seeding with exotic grasses has been shown to increase the likelihood of premature reburn, thus promoting type conversion. This conversion often can lead to increased erosion. Growing infestations of non-native species are likely to drive populations of native species so low as to require listing by state or federal agencies. Exotic plants may trap nearly all the energy flowing through the natural systems of the many areas where they have completely displaced indigenous plants, resulting in conversion from one vegetation type to another. This energy, instead of entering the food chain, is channeled into further proliferation by the invading plant, thus energizing the cycle.
Land dominated by weeds has low biological value and is of little or no use to human societies.
The land's ability to function in a biologically stable way is impaired. Citations Bureau of Land Management, Partners Against Weeds, An action plan for Bureau of Land Management, January 1996. California Native Plant Society's Inventory of Rare and Endangered Vascular Plants of California, 1994. California Native Plant Society. Statement of Policy - Seeding After Wildfire, December 1995.