Native Plants
Q. Who is Mr. Smarty Plants?
A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.
Did you know you can access the Native Plant Information Network with your web-enabled smartphone?
Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.
rate this answer
Wednesday - July 22, 2009
From: Baltimore, MD
Region: Mid-Atlantic
Topic: Rain Gardens, Compost and Mulch, Grasses or Grass-like
Title: Native plants for a bioswale in Baltimore
Answered by: Barbara Medford
QUESTION:
What native plants would suit a bioswale in an urban part of Baltimore City? The clay soil gets waterlogged and the site has part shade.ANSWER:
Mr. Smarty Plants is not THAT smart, and can always learn something new. This time we learned about bioswales. Common swales are typically vegetated with turf grass and are a conveyance tool, basically a grassy stormwater sewer that conveys water as quickly as possible from Point A to Point B. A bioswale differs in that the turf grass is replaced with native prairie vegetation. This will significantly reduce the flow velocity (slow down of the runoff) in the swale’s drainage course. The residence time of the runoff is thus increased, which gives it the time to be stored, filtered, and infiltrated. These processes remove pollutants and suspended solids from runoff.
In terms of your clay soil, we found this information on bioswale construction from the USDA, which shows compost tilled into the native soil (clay, in this instance) to facilitate the drainage. The plants we have selected are all perennial, tolerate shade, and will grow in moist, clay soils. These are plants with fibrous roots that will hold in the soil when water is rushing by, help to slow it down, and permit the pollutants in the water to be filtered out.
Since our suggestions are basically for prairie grasses, you might be interested in reading our How-To Article Recreating a Prairie, which has instructions for time of year to be planting, preparing the soil, planting and caring for the grasses. When you are ready to begin, go to our Native Plant Suppliers section, put your town and state in the Enter Search Location box, and you will get a list of native plant nurseries, seed companies and landscape consultants in your general area who can help you select the right plants for your purpose.
Andropogon gerardii (big bluestem)
Carex blanda (eastern woodland sedge)
Carex hystericina (bottlebrush sedge)
Chasmanthium latifolium (Inland sea oats)
Elymus canadensis (Canada wildrye)
Elymus virginicus (Virginia wildrye)
Sorghastrum nutans (Indiangrass)
More Rain Gardens Questions
plants for a rain garden's moist area in Central Texas
January 15, 2015 - I am looking for local natives to plant in the wet portion of a rain garden/bioswale. Can you help, please?
view the full question and answer
Native plants beneficial to wildlife in Cincinnati, OH
April 25, 2008 - I live in Cincinnati, Ohio and I am looking for native plants to plant in a small area of trees behind my house. I would like the plants to be beneficial for wildlife, like maybe some wildflowers. T...
view the full question and answer
Rain garden plants for Ketonah, NY
March 30, 2010 - Rain garden plant selections for lower NY state
view the full question and answer
Native Texas plants for rain gardens
March 07, 2007 - I am looking for native Texas plants that would do well in very shady and partial shade rain gardens. Do you have any suggestions?
view the full question and answer
Need suggestions for plants for bioswales in Philadelphia, PA
August 24, 2015 - Hello,
Are there a handful of species you would recommend for inclusion in bioswales throughout the US? I realize plants need to be selected based on climate, but I'm wondering if there are two or...
view the full question and answer
Support the Wildflower Center by Donating Online or Becoming a Member today. |