HomeMy Public PortalAboutrain_garden_maintenance_brochure_081414Metropolitan St. Louis Sewer District Web Site: www.stlmsd.com 24-Hour Hotline 314.768.6260 Metropolitan St. Louis Sewer District
Rain Gardens
Post-Construction
Best Management Practices (BMPs)
Ownership and Maintenance
Get to Know Native Plants
BUTONBUSH
CEPHAFANRHUS OCCIDENAFIS
3-6’ JULY-AUGUST
CARDINAL FLOWER
LOBELIA CORDINALIS
2-4’ JUNE-SEPTEMBER
CULVER’S ROOT
VERONICASTRUM VIRGINICUM
3-5’ JUNE-AUGUST
GIANT BUR-REED
SPARGANIUM EURYCARPUM
1-3’ MAY-JUNE
Metropolitan St. Louis Sewer District
Division of Environmental Compliance
10 East Grand Avenue
St. Louis, MO 63147-2913
Phone: 314.768.6260
www.stlmsd.comYour MSD @Your MSD
GREAT BLUE LOBELIA
LOBELIA SIPHILITICA
2-4’ AUGUST-SEPTEMBER
MOUNTAIN MINT
PYCNANTHEMIM VIRGINIANUM
2-4’ JULY-SEPTEMBER
NEW ENGLAND ASTER
ASTER NOVAE-ANGLIAE
1-5’ AUGUST-OCTOBER
PALM SEDGE
MUSKINGUMENSIS
1-3’ AUGUST-OCTOBER
PRAIRIE
BLAZING STAR
LIATRIS PYCNOSTACHYA
2-4’ JULY-SEPTEMBER
RIVER OATS
CHASMANTHIUM
LORIFOLIUM
2-3’ FALL COLOR
SNEEZEWEED
HELENIUM AUTUMNALE
2-6’ AUGUST-OCTOBER
STIFF GOLDENROD
SOLIDAGO RIGIDA
2-4’ JULY-OCTOBER
ARROWHEAD
SAGIREARIA GRAMINEA
1-2’ JUNE-SEPTEMBER
Get to Know Common Weeds
CASTOR-BEAN
COMMON RAGWEED
CURLY DOCK
POKEWEED
WINTER CREEPER
EUONYMUS
YELLOW NUT
SEDGE
Get to Know Native Plants
Resources
Show Me Rain Gardens
www.showmeraingardens.com
Missouri Botanical Garden
www.mobot.org
MSD BMP Toolbox
www.stlmsd.com/engineering/planreview/bmptoolbox
What is a Rain Garden?
Every time it rains, stormwater flows down roofs, driveways
and other impervious surfaces, sometimes flooding
basements or collecting in low spots. Other runoff continues
on toward the street, picking up soil, pesticides and other
contaminants before it enters storm drains that transport
it to streams and lakes, often without treatment. A rain
garden is a planted area where rainwater collects.
Think of a rain garden as a sponge -- an environmentally
friendly sponge -- that is designed to soak up much of
this runoff before it can do damage. A rain garden starts
with a bowl-shaped bed of loose soil. The garden is planted
with deep-rooted trees, bushes, flowers and other plants
that help absorb the rainwater, which filters through layers
of soil before entering the groundwater system or to
the stormwater system through the underdrain. In this
way, your rain garden is your personal contribution to
cleaner water!
Benefits of a Rain Garden
Reduce stormwater runoff which helps:
Reduce erosion
Reduce flooding
Lower volume of water entering the
storm system
Filter harmful pollutants
Landscaping your property:
Becomes a beautiful addition
Improves property value
Provide food and habitat for wildlife
Increase biodiversity
Quick Fact!
After a rain, it is normal to see shallow ponded water in the
rain garden, but only for a day or two. Mosquitoes need 7
to 10 days to lay and hatch eggs. Mosquitoes are more
likely to lay eggs in bird baths and clogged gutters. Also,
rain gardens attract frogs, dragonflies and birds that eat
mosquitoes!
Metropolitan St. Louis Sewer District Web Site: www.stlmsd.com 24-Hour Hotline 314.768.6260 Metropolitan St. Louis Sewer District
Rain Garden Inspection
and Maintenance Schedule
FEBRUARY TO MARCH
Remove trash and debris
Prune bushes and trim other plants to near
the surface
Remove old compaction mulch and replace
with new
APRIL TO MAY
Replace or remove any diseased,
undesirable, or dead plants
Separate or move plants if you like
Pull weeds
JUNE TO AUGUST
Water plants during extremely dry periods
SEPTEMBER TO OCTOBER
Remove trash and debris
Replace or remove any disease,
undesirable, or dead plants
Pull weeds but leave grasses and flowers
over winter
Check for adequate mulch cover
Repair any eroded areas within the garden
or surrounding area
NOTE: AFTER IT RAINS
Check for muddy water or eroding soils
draining into the garden
Check for standing water (longer than three
days)
Maintenance Cost of
Typical Rain Garden
Maintenance costs will vary as a result of several factors,
including drainage area, size of BMP, and type of plantings.
Preventative maintenance is key to minimizing major costs
associated with repairs. A general rule of thumb to estimate
maintenance costs is 3%-6% of the installation costs.
Maintenance may be higher the first few years, while plants
are being established.
Tips for a Successful Rain Garden
Trimming and Pruning: Stems from grasses and
flowers can be left through the fall and winter to add visual
interest and to provide food and cover for birds. Trim
plants near the surface during appropriate months with a
string trimmer or pruner and remove dead vegetation to
encourage new growth. Shrubs may be pruned to give
them the “shape” you like.
Fertilizing: Appropriate fertilizer during the first year may
help establish healthy plants. Fertilizer beyond this is not
necessary because it stimulates weed growth and reduces
water quality benefits.
Mulching: A two to three-inch application of mulch after
initial planting is beneficial. Replacement of old mulch in
the spring helps with the garden appearance and drainage.
Use standard single or double shredded hardwood mulch
that is “well aged” (at least a year since it was shredded)
and free of soil, weed seeds, herbicides, etc. Pine bark and
“chipped” mulch is NOT recommended as it tends to float
and wash out easily.
Trash: Trash and other debris like leaves and grass
clippings should be removed as needed. Please do not pile
or spread leaves or grass clippings in your rain garden.
Edges: A border defines the edge of the garden just as a
frame defines a painting. A strip of mowed turf, stones, or
a walking path can set the area apart and can improve rain
garden appearance.
All landscape requires maintenance; a rain garden is
no different. Following these maintenance tips will help
ensure the rain garden functions well and remains an asset
to your home.
Water Ponding: After a rain shower, it is normal to see
shallow ponding in the rain garden for a day or two. Please
do not fill in the ponding area. If water is still observed
after three days, then it may be necessary to rake or poke
shallow holes in the soil. If water is still observed, replace
the top layer of soil and mulch.
Sediment: Muddy water flowing into the rain garden, such
as from an eroding area in the yard, could lead to clogging.
Repair the eroded areas quickly and remove the sediment
that “settles out” on top of the mulch.
Weeding: Weed growth during the plant establishment
period is typical and weed removal helps eliminate
competition with desirable plants. Weeds can be addressed
with spot use of herbicide or by pulling. Blanket use
of herbicide is never recommended. Diligent weeding
during the first two years produces desirable plants that,
by year three, are mature enough to compete and crowd
out most weeds.
Watering: The plants in your rain garden should not require
watering once mature plants are established. However,
watering helps plant appearance during drought periods.