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New Hampshire Department of Environmental Services

Ideas for a Cleaner Environment
Published monthly by the NH Department of Environmental Services Watershed Assistance Program, Concord, NH (603) 271-7889

July, 2007

A Healthy Garden and Lawn Makes for a Healthy Watershed

No matter where you live, you are in a watershed. Within that watershed, rain and snow falling on homes, lawns, and driveways eventually finds its way to the lowest point – in a river, lake, pond, stream, or ocean. Often, without realizing it, homeowners add pollutants, including lawn chemicals, fertilizers, silt, and sand, to surface waters. However, with a few minor changes to your garden and lawn care routine, you can begin playing an active role in improving water quality in your watershed, while saving yourself both time and money.

You can start by taking a close look at landscaping and gardening practices around your house that might be contributing to polluted runoff. Once you start looking at your yard as a solution to pollution rather than a cause, it is easy to make a few changes and still have a beautiful yard and garden.

Do you need all that lawn? Reducing the size of your lawn will not only save you time and money from mowing, watering, and fertilizing, but it will also save your watershed from pollutants in fertilizers, pesticides, and other backyard runoffs. Plant groundcovers, trees, flowers, and shrubs to help water infiltrate into the ground and prevent soil erosion instead of running off a compacted lawn. Creating attractive wildlife habitat can be an added benefit.

How healthy is your soil? Test your soil to know what it actually needs before you apply fertilizer or lime. If you must fertilize, select a slow release fertilizer or organic fertilizer to avoid excess nutrients running into the water. Extra nutrients in waterbodies increase aquatic plant growth, and their eventual decay depletes oxygen needed by fish and other aquatic creatures. Maintain a fertilizer-free buffer around wetlands and surface water. Do not to apply fertilizer within 25 feet of these sensitive areas.

What types of grasses are growing in your lawn? Where you need to have a lawn, a mixture of grasses (e.g., fine and tall fescue, perennial ryegrass, and Kentucky bluegrass), clover, and legumes is the ideal combination. The mix of the different species requires less nitrogen fertilizer, less water, is more resistant to diseases and pests, and provides a more hospitable environment for beneficial insects.

What types of plantings do you have? Consider planting natural, native plant species instead of non-native plants (plants that were introduced for agricultural purposes or by accident). Native plants generally require much less water, pesticides, fertilizers, or trimming.

Do you know your bugs? Identify your particular pest problem and choose the best method or combination of ways to deal with it. Use beneficial nematodes (microscopic predators for specific insects) or milky spore (insect specific diseases) and plant insect-repelling borders of marigolds, chives, onions, garlic or basil. Also, it is a good idea to rotate crops to keep insects from settling in.

Do you use compost? Professional landscapers and gardeners suggest adding organic material to your soil by mulching your plantings and top dressing your lawns with compost. Compost will reduce the need for fertilizers and water by supplying nutrients and helping the soil retain moisture.

Remember, whether we live in a city neighborhood or on a hillside far from a river or lake, each of us can help keep our watershed clean and healthy.

For more information on how your backyard can help water quality, contact Barbara McMillan, Outreach Coordinator, NH Department of Environmental Services, (603) 271-7889. For information about your garden or lawn, soil testing, native plants, composting, and more, contact the UNH Cooperative Extension Family Home & Garden Education Center Info-Line (877) 398-4769.

NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

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