Do you have a wet spot in your yard that you've been trying to contend with? Do
you have problems with water runoff? Instead of trying to drain the water off of
your property, take advantage of it by creating a rain garden.
Why build a rain garden?
Rain gardens not only provide visual interest to yard but also help your local
streams. They are small vegetated depressions that promote infiltration of
stormwater runoff from your roof, driveway and lawn. Some are even designed to
capture runoff from the street.
Rain gardens help things like fertilizer, loose soil and grass clipping stay in
your yard and out of the local streams and Lake Superior, where they can add
unacceptably high levels of nutrients to the water, increase the stream turbidity
or deplete oxygen as the stuff rots. (Read more about how
erosion and
lawn fertilizers impact the
streams.)
Where do I start?
Rain gardens are designed with a depression to hold water after rain storms and a
shallow swale to route storm water from roofs and driveways to the garden. Plants
are selected to be tolerant of large water volumes, and to aid in infiltration and
pollutant capture. Use the links in the blue box above
for design information for your rain garden. A list of native plants that will
thrive in a wet garden can be found below.
This video and other stormwater management stories can be found on this
website.
Before and after pictures of rain gardens.
Photos courtesy of Burnsville Rainwater Garden Retrofit Project, City
of Burnsville, Leslie Yetka
Native plants for the wet garden
The book,
"Plants for Stormwater Design: Species Selection for the Upper
Midwest", describes 131 plant species regarding their use in
stormwater-management practices. Available online at the
MPCA website.
The following list of plants is reasonably specific to North East Minnesota. Some
species are at the extremes of their temperature comfort zone, however, best
gardening management practices such as mulching, amending soils to improve its
drainage and selection of a protected planting site will work to extend a plant's
comfort zone. During periods of drought, particular attention to maintaining soil
moisture must be a priority of wet garden maintenance.
Some experimentation with a variety of plant materials will probably be required
to discover the correct blend of soil wetness, soil type and available sun light
for success with many of the suggested species of plant in a specific garden's
environment.
The suggested plants provide a variety of heights, foliage textures and flower
colors to create a visually interesting garden. Specialist plant nurseries deal in
native plants. The ornamental plant industry has worked to develop many good and
improved varieties based on the native plant stocks listed. Native plant varietals
often add landscape interest through changes in flower and foliage shape and
color. The use of varietals should be investigated when planning a wetland's
garden.
Many of the listed plants can be collected as seed in the wild and germinated at
home then subsequently transplanted into the wetland garden. To follow a plant
culture program requires special knowledge and techniques for successful
germination of many of the listed plant species. Books, web searches, plant
nurseries and local extension agents can help access the necessary information for
developing a plant culture program.
Ferns & Fern Allies
Sensitive Fern (Onoclea sensibilis) -shade tolerance and wet soil.
Cinnamon Fern (Osmunda cinnamomea) - prefers shade to partially shady location
and wet acid soils.
Royal Fern (Osmunda regalis) - likes sun and wet acid soils.
Interrupted Fern (Osmunda claytonia) - prefers drier and seasonally wet areas
compared to the other Osmunda species.
Scouring Rush (Equisetum sp) - depending on species, partial shade to sunny
locations.
Spotted Joe - Pye - Weed (Eupatorium maculatum) - prefers sun but accepts
periods of light shading. Will grow in most conditions but prefers moist,
well drained soil.
Boneset (Eupatorium perfoliatum) - often found with Joe-Pye-Weed.
Common Flat-Topped Goldenrod (Solidago graminifolia) - prefers a sandy
better drained soil and sun or some shade.
Common Sneezeweed (Helenium autumnale) - prefers sunny conditions with
plentiful moisture in a well drained soil. Not common in the wilds of NE
Minnesota, however a number of attractive ornamental varieties are available
from plant nurseries and viable in the area.
A variety of members of the sedge family are available from plant nurseries
specializing in native plants. Of particular visual interest are members of
the genus Cyperus - the flatsedges and Eleocharis - the spike-rushes and
Scirpus - the bulrushes (especially wool grass - S. cyperinus and woodland
bulrush - S. expansus).
Iris Family
Yellow Flag (Iris pseudacorus) - Likes partial Sun and very wet conditions.
Non - native
Northern Blue Flag (Iris versicolor) - Partial shade to sunny conditions.
Wet soil but will withstand shallow water.
Lily Family
Turk's - cap lily (Lilium superbum) -sunny conditions and well drained,
moist soils.
False Solomon's Seal (Smilacina trifolia) - partial shade to sunny
conditions with humus-rich, moist soil.
Grass Family
Bluejoint grass (Calamagrostis Canadensis) - sunny; forms clumps. Doesn't
mind wet roots.
Virginia Wildrye grass (Elymus virginicus) - shade to partial shade. Moist,
rich, well drained soils.
Foxtail Barley (Hordeum jubatum) - exceptional visually attractive; sunny
conditions. Exists in a variety of soil conditions.
Prairie Cordgrass (Spartina pectinata) - Sunny conditions and moist soils.
