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Coronavirus COVID-19

COVID-19 Advisory: WSU Extension is working to keep our communities safe. All Extension programming is being conducted consistent with the latest official state guidance. WSU Extension county offices and WSU Research & Extension Centers are following protocols for vaccination, masking, distancing and hygiene. If this office is not open to the public, we are available during normal business hours via email, phone, and web conference.

Gardening Websites – Tip Sheet #1

General Gardening Information

  • WSU Extension site, Gardening in Washington – information on many gardening topics. Link to website
  • WSU Extension publications – many available for free download. Link to website
  • King County Master Gardener program, plant clinics, demonstration gardens, and more. Link to website
  • Linda Chalker-Scott, WSU Extension Urban Horticulturist – common myths about gardening. Link to website
  • Oregon State University Extension – gardening articles, month-by-month gardening calendars, et al. Link to website
  • University of Washington’s Miller Library site – Gardening Answers Knowledgebase, list of regional plant sales and garden tours, directory of horticultural websites, extensive resource lists and resources for plants. Link to website
  • Fact sheets and photos of ~1000 plants that perform well in the Pacific Northwest and are relatively low maintenance. Plant lists and advanced search options. Sponsored by Elisabeth C. Miller Botanical Garden. Link to website
  • New homeowner? Call before you dig: Washington Utility Notification Center, phone # is 811. Link to website

Pests, Diseases, Weeds and Pesticides

Invasive Scotch broom
  • WSU Extension Hortsense and Pestsense – advice on plant pest and disease problems. Includes information on weeds and Washington-registered pesticides. Link to hortsense website or pestsense website
  • Pacific Northwest plant disease, insect and weed management handbooks online. Sponsored by WSU, Oregon State U. and U. of Idaho. Link to website
  • King County Noxious Weed Control Program – weeds on the noxious weed list, including control strategies. Link to website
  • EXtension TOXicology NETwork – cooperative effort of UC Davis, OSU, Michigan State U., Cornell U., and U. of Idaho – Information on pesticides, pesticide use and toxicity. Link to website
  • Guide to choosing safer pesticides and garden products. Link to website

Composting and Soil Testing

Green waste
  • King County Solid Waste Division – composting and improving soil health. Link to website
  • Seattle Tilth – composting methods and bins (including worm composting), plans for building composters. Link to website
  • King Conservation District – soil testing program. Link to website
  • WSU Puyallup – extensive information on soils and soil testing and interpreting results. Link to website

Native Plants

  • King County Water & Land Resources Division – Northwest Native Plant Guide – plant lists, photos, and landscape plans. Link to website
  • King County Natural Resources & Parks Division – Native Plant Resources for the Pacific Northwest. Link to website
  • Washington Native Plant Society – plant lists, publications, plant sales. Link to website

Lawns and Gardens – City, County and State Resources

  • Water utilities in King County – gardening advice, videos, classes. Link to website
  • Seattle Public Utilities – lawn care advice and resources. Link to website
  • Seattle Public Utilities – Integrated Pest Management, including Facts Sheets on moss, pests and weeds. Link to website
  • King County Solid Waste Division – Natural Yard Care – ways to have healthy lawns and gardens with less pesticide use. Link to website
  • Washington State Department of Fish & Wildlife: Living with Wildlife. Link to website
  • King County Public Health – landscaping tips for septic systems. Link to website
  • Washington Poison Center, statewide provider of assistance regarding exposure to poisonous, hazardous, or toxic substances, including plants. Link to website or call 1-800-222-1222

Local Companies

Local plant nurseries and seed companies often have helpful information at their websites. Two of the most useful are: Territorial Seeds and Raintree Nursery. Link to Territorial Seed website or Raintree Nursery website




Detail image of compost by Ben Kerckx.

CLH 12/20/19


WSU Extension Master Gardener Program * 206-543-0943 * * Center for Urban Horticulture * Box 354115 * Seattle WA 98195-4115 Extension programs and employment are available to all without discrimination. Evidence of noncompliance may be reported through your local Extension office.


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