Green Neighbors Program

The Clark County Green Neighbors Program is coordinated by Clark County Public Health’s Solid Waste and Environmental Outreach to assist citizens with developing more sustainable lifestyles and building a strong environmental community in Clark County. Solid waste regional planning and programs are a cooperative effort of Battle Ground, Camas, Clark County, La Center, Ridgefield, Vancouver, Washougal, and Yacolt.

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  • Soil

    We don’t call that brown stuff on the ground dirt. In recent years we have come to understand how that soil is very much alive.

    Soil is the single most important thing to get right in your garden or landscape.

    It is very difficult to meaningfully change the composition of residential house lot soil. Instead, we recommend incorporating a significant amount of compost and/or appropriate soil conditioner into the soil, then topping it with a thick layer of woody mulch. Improving the soil (and maintaining its health) is different for lawn than for ornamental garden beds. Learn more about the various aspects of soil below.

    Below are some invaluable resources to help in your quest to make and maintain good soil.

    • Home Gardeners Guide to Soils & Fertilizers pdf — WSU Extension.

      This is what is taught to the Master Gardeners. Pretty much everything you need to know about soil, nitrogen cycle, fertilizers.


      Nitrogen in Garden Soils pdf — NBB program.

      Handy information about what type of nitrogen plants need and when they need it.

    • Nutrient Cycling (or nitrogen cycle)

      This is a term used to describe the process of how organic matter is cycled and recycled through an ecosystem. One of the ways nutrients is recycled is by breaking down fall leaves. We feel using one’s fall leaves is the most low-cost and low-maintenance way of supplying mulch and nutrients to your ornamental landscape.

      • Using Leaves as Mulch pdf — How fall leaves can improve ornamental landscape beds. Flyer companion to voice recording.
    • Soil Food Web

      Feed the soil and it will feed your plants. Learn how the soil food web works and how you can help it thrive.

      • Soil Food Web — by Elaine R. Ingham for the United States Department of Agriculture
      • Teaming with Microbes: The Organic Gardener’s Guide to the Soil Food Web — by Lowenfels, Jeff & Lewis, Wayne. Timber Press 2010.

        Just about the best, most typical-gardener-friendly explanation of how soil works. We consider this a ‘must read’ book. We like that it has an organic leaning. The link is to, but this book is also at the library.

      • Lowenfels has authored other books about the soil including:

        • Teaming with Nutrients: The Organic Gardener’s Guide to Optimizing Plant Nutrition
        • Teaming with Fungi: The Organic Grower’s Guide to Mycorrhizae
    • Soil Testing

    • Soil Types

  • Compost

    In ornamental gardens in our region, compost should always be covered by mulch. Compost is a medium that has nutrients released for absorption by plant roots. If it is left uncovered, it will grow weeds! One of the functions of mulch is to help prevent weeds. Compost should not be used for weed prevention. If you have an established ornamental garden, you may not ever need to apply compost if you maintain proper mulch coverage. If you are creating a new garden or rehabilitating a worn out one, you can either incorporate compost into the soil’s upper layer, or you can simply put a layer of compost on top of the soil; then apply a layer of woody mulch.

    These resources will help you understand what compost is, how it works, and basics principles you need to know about composting to help you get started.

  • Mulch

    In ornamental gardens in our region, mulch should always cover both bare soil and compost. Mulch helps the soil in ornamental gardens by: moderating temperature, retaining moisture, providing nutrients as it slowly composts in place, and preventing weeds.

    Mulch can be a variety of materials, but we recommend high-carbon, un-composted, woody material. In our area, tree bark is most commonly used. But the NBB program advocates using fall leaves as mulch. And why not? They fall from trees into the garden requiring minimal-to-no cost or work in accomplishing the task of mulching. Leaves (and other woody debris) are pretty much what a natural forest uses for mulch, and that system has worked well for millennia. Why not borrow from what works?

    We also like use of arborist chips as mulch.


      How Plants & Mulch Prevent Erosion — Video by Fun Science Demos.

    • Proper Mulching pdf — International Society of Arborculture (ISA).


      Mulch, Mulch, Mulch — Goodnight Design.

      The logic of using fall leaves as mulch in the ornamental garden.

    • Nutrient Cycling (or nitrogen cycle)

      This is a term used to describe the process of how organic matter is cycled and recycled through an ecosystem. One of the ways nutrients is recycled is by breaking down fall leaves. Using fall leaves is the most low-cost and low-maintenance way of supplying mulch and nutrients to your ornamental landscape.

    • Wood Chips as Mulch

      Check out Arborists use this website to check to see if anyone near their project is registered to accept a free delivery of chips. It is a great deal, but you should be aware that they cannot give you an exact time/date when they will make their delivery, you do not get a choice what type of tree wood you will get, and you do not know the quantity you will get.

      Read Dr. Linda Chalker-Scott’s paper on wood chips below to learn why we like them so much.

      • Wood Chip Mulch pdf — WSU Extension, Puyallup.

        This is one of Dr. Linda Chalker-Scott’s excellent fact sheets.

  • Erosion Prevention

    Erosion can be a problem in any landscape even if there isn’t much slope. There are various types of erosion, but in the video below, they are talking about how the flow of water over or through the soil can cause erosion.

    But as good as mulch is at preventing erosion, it isn’t as good as a dense planting of live plants. This video shows how much cleaner the planted soil water overflow is than without plants or mulch.


    How Plants & Mulch Prevent Erosion — Goodnight Design.
    Contains very nice video demonstration by Fun Science Demos.


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