Choosing Plants for the Rain Garden

In choosing and placing plants for a rain garden one must remember that a rain garden is not a single garden (like a bog, pond or woodland), but rather a many zoned depression that provides habitat for a wide range of plants. For example, in the wettest central depression area,  it’s wise to select plants whose root systems don’t mind wet feet.

raingarden early spring

Rain Garden in early Spring with most herbaceous perennials still dormant

Even if your particular rain garden is on the level side, or narrow and sloping — during your rainiest times of the year roots must enjoy the moisture.  That said, if you pay attention to drainage and your garden is designed with higher drier perimeter areas, you could include more xeric plants that require very little or no extra watering!

I would go so far with this concept to suggest that selecting plants for a rain garden, especially with respect to drainage, is similar to the process that rock gardeners go through when designing places for their alpine and sub alpine plants. Like a rock garden environment, a rain garden must by design requirements provide excellent drainage.

The following original plant list reflects just those plants established with the rain garden in the spring of last year. As each plant reaches its bloom season common names in the list will be a link to a picture.  Plants under propagation or planned for adding this spring are indicated by the delta symbol.

Initial Plantings (2012)    

northwest native;  Δ to be added spring 2013

  • Amelanchier x grandiflora  ‘Autumn Brilliance’   (Serviceberry)
  • Iris tenax   (Oregon Iris)  
  • Rudbeckia fulgida  ‘Goldstrum’  (Black Eyed Susan)
  • Lupinus poltphyllus  (Large Leaf Lupine)
  • Aster subspicatus  (Purple Dome Douglas Aster)
  • Penstemon x mexicanus ‘Pikes Peak Purple‘  (Pike’s Peak Beardtongue)
  • Digitalis purpurea ‘Foxy’   (Foxglove)
  • Solidago rugosa  ‘Fireworks’  (Solidago ‘Fireworks)
  • Aquilegia alpina   Δ   (Alpine Columbine)
  • Aquilegia formosa    (Western Columbine)
  • Coreopsis verticella ‘Zagreb’  (Zagreb Tickseed)
  • Achillea
  • Camassia quamash (Small Camass)
  • Juncus patens ‘Elk Blue’  (Taper-Tipped Rush)
  • Deschapsia cespitosa ‘Pixie Fountain’  (Dwarf Tufted Hairgrass)
  • Acorus gramineus ‘Ogon’   (Variegated Sweet Flag)
  • Polistichum minutum  (Sword Fern)
  • Sysyrinchium idahoense  (Idaho Blue-eyed grass)
  • Fragaria chiloensis (Beach Strawberry)
  • Arctostaphylos uva-ursi  (Kinnikinnick)

Rain Garden Update Winter 2012-2013

The rains came as expected this winter. October, November and December were wet and generally milder (above average temps). The rain garden performed exceptionally well.

rainchain1

It was a pleasure to watch the torrent of rain cascading down the rain chain. The barrel filled so quickly during the rainiest of days that I frequently opened the spigot and let the rill carry water to the garden.  I can think of only one day when I even noticed a bit of “pooling” in the center depression of the garden, but that quickly receded within an hour or two after the deluge ceased.

It really wasn’t necessary to direct any overflow from the barrels to the foundation drain.  Instead I just opened the spigot in heavy downpours and let the rain garden handle all the flow.

Improvements to the low area on the west of the house  — where heavy rains used to result in the foundation drain creating a small pool  —  were noticeable.

The following original plant list reflects just those plants established with the rain garden. As each plant reaches its bloom season common names in the list will be a link to a picture.  Plants under propagation or planned for adding this spring are indicated by delta symbol.

Initial Plantings (2012)    

northwest native;  Δ to be added spring 2013

  • Amelanchier x grandiflora  ‘Autumn Brilliance’   (Serviceberry)
  • Iris tenax   (Oregon Iris)  
  • Rudbeckia fulgida  ‘Goldstrum’  (Black Eyed Susan)
  • Lupinus poltphyllus  (Large Leaf Lupine)
  • Aster subspicatus  (Purple Dome Douglas Aster)
  • Penstemon x mexicanus ‘Pikes Peak Purple‘  (Pike’s Peak Beardtongue)
  • Digitalis purpurea ‘Foxy’   (Foxglove)
  • Solidago rugosa  ‘Fireworks’  (Solidago ‘Fireworks)
  • Aquilegia alpina   Δ   (Alpine Columbine)
  • Aquilegia formosa    (Western Columbine)
  • Coreopsis verticella ‘Zagreb’  (Zagreb Tickseed)
  • Achillea
  • Camassia quamash (Small Camass)
  • Juncus patens ‘Elk Blue’  (Taper-Tipped Rush
  • Deschapsia cespitosa ‘Pixie Fountain’  (Dwarf Tufted Hairgrass)
  • Acorus gramineus ‘Ogon’   (Variegated Sweet Flag)
  • Polistichum minutum  (Sword Fern)
  • Sysyrinchium idahoense  (Idaho Blue-eyed grass)
  • Fragaria chiloensis  (Beach Strawberry)
  • Arctostaphylos uva-ursi  (Kinnikinnick)