Credit 2.3: Invasive Species
This credit applies to removal, reduction and management of invasive vegetation and noxious weeds.
This credit recognizes efforts to remove invasive or noxious vegetation and re-plant with native vegetation (see Credit 2.1 “Riparian Vegetation”). Some common invasive species are noted below. (For more detailed inventories and information on invasive/noxious species and their management, see “For more information.”)
While it is possible to eradicate some invasive species, others can only be reduced and then managed to contain or curtail their spread. In most cases, management and eventual eradication is an ongoing and long-term effort.
How to proceed
Many of the resources below provide information on identifying invasive plants, techniques for their removal and the native species to use as replacement vegetation. You might also enlist the help of a local ecologist, botanist, landscape architect, horticulturist, or landscaper with experience in riparian planting for marine or freshwater shores, depending on where you are situated. Your municipal or county/regional district government may also be able to help with written information, expertise and even some funding for invasive removal. Similarly, many environmental organizations are involved with invasive management and native plant restoration; check with a local land trust or natural history society for ideas and help.
Include ongoing invasive species management as part of the regular landscape maintenance schedule or checklist (see Appendix A). Monitor your property for several years for signs of returning invasive vegetation and/or noxious weeds, and plan to remove them as needed. Remember that it is much easier to remove these species as they emerge rather than once they are established. Again, a qualified professional, your local government or local environmental group can advise on effective but environmentally friendly ways to manage particularly tenacious species. Suggest that your neighbors share in work parties to help each other, or suggest the same to your Homeowners or Neighborhood Association.
Where this credit applies
This credit applies to whole-site and shoreline/riparian development, on any shore type and in either marine or lake environments.
This credit offers up to 4 base points.
|Remove invasive vegetation and re-plant cleared areas with native vegetation over the entire property; continue to manage invasive species as part of regular landscape maintenance.||
property > ½ acre – 4 points
|property < ½ acre – 3 points|
|Remove invasive vegetation and re-plant cleared areas with native vegetation in the riparian buffer (area within 35 feet/10 m of OHWM).||
Before and after shots of the same bank showing invasive species removal. (MSDG RE-6, RE-7). The schedule of plantings for this site is also listed below.
For more information
E-Flora BC. 2012. Electronic Atlas of the Flora of British Columbia: http://www.geog.ubc.ca/biodiversity/eflora/index.shtml
Garry Oak Ecosystems Recovery Team – Invasive Species and Restoration. http://www.goert.ca/publications_resources/invasive_species.php
Green Seattle Partnership. 2012. Management Strategies for Invasive Plants: http://greenseattle.org/how-to-remove-invasive-plants
USDA. 2012. National Invasive Species Information Center. U.S. Department of Agriculture (USDA). http://www.invasivespeciesinfo.gov/plants/main.shtml
Washington Native Plant Society lists of native plants available at http://www.wnps.org
Washington State University Master Gardener Program – for help with choosing plants http://mastergardener.wsu.edu/