LANDSCAPING YOUR DRAINFIELD


On-site sewage systems and drainfields represent an important investment for the homeowner. Proper planning and protecting your system from damage can save substantial time, work and money. It is important to check on the location of the drainfield before doing any landscaping, gardening, or construction work.

Proper care and planning for your drainfield includes avoiding the following in the drainfield area:

DO NOT-
* Use impermeable materials such as concrete or plastic, they reduce evaporation and the supply of oxygen to the soil.
* Allow traffic such as vehicles, heavy equipment, and livestock, the pressure
can compact lthe soil, and even damage pipes.
* Water-excess water reduces the soils ability to treat wastewater.
* Plant deep rooted plants - these tend to invade and damage drain pipes.
* Rototill - can be damaging to pipes.

Here are some options for drainfield plantings:


Grasses do not always need to be mowed. They are great conservation plantings to stabilize the soil. They also provide food and cover for small birds. By mixing with shallow rooting native flowers, you can create a prairie or meadow. Festuca (fescue) grasses are better suited for areas under or near trees.

 

PLANTS WITH SHALLOW ROOTS


1. Herbaceous annuals.

(These are just some examples.)
Ageratum (Ageratum houstonlanum)
Wax Begonia (Begonia semperflorens)
Coleus (Coleus species)
Impatiens (Impatiens species)
Lobelia (Lobelia erinus)
Sweet alysum (Lobularia maritima)
Geranium (Pelargonium x hortorum)
Petunia (Petunia x hybrida)
Salvia (Salvia species)
Marigold (Tagetes patula)
Zinnia (Zinnia elegns)

2. Herbaceous perennials such as :


Ameria, Seathrift ( Armeriac maritima)
Astilbe (Astilbe x aredsli)
Basket of Gold ( can also be used as a ground cover) Aurinia saxatillis
Campanula (Campanula tomentosum)
Snow in Summer ( Cerastlum tomentosum)
Lily of the Valley ( Convallaria majalis)
Sweet William (Dianthus barbatus)
Cottage (and other) Pinks (Dianthus species)
Coral Bell (Heucheria sanguinia)
Candytuft (Iberis empervirens) evergreen
Lavendar (Lavendula angustifolia) evergreen
Moss Pink (Phlox subulata)
(There are many more)

3. Ground covers (all perennial)


Carpet Bugle (Ajuga reptans)
Kinnickinnick (Arctostaphylos uni-ursa)
Irish moss (Arenaria verna)
Bunchberry (Cornus canadensis)
Blue fescue (Fastuva ovina glauca)
Wintergreen (Gaultheria procumbens)
Salal (Gaultheria shallon)
Lydia broom (Genista lydia)
Pachysandra (Pachysandra terminalis) Shaded areas only.
Sword fern (Polystichum munitum)
Stone Crop (Sedum species)
Hens and Chicks (Sempervirum tectorum)
Periwinkle (Vinca minor)
Thyme (Thymus species)
There are others.


Developed by: Ray Maleike, Extension Horticulturist
WSU Puyallup