The role of plant species in the bioretention concept is to bind nutrients and other pollutants by plant uptake; to remove water through evapotranspiration; and to create pathways for infiltration through root development and plant growth. Root growth provides a media that fosters bacteriologic growth, which in turn develops a healthy soil structure.  A variable plant community structure is preferred to avoid monoculture susceptibility to insect and disease infestation and to create a microclimate, which ameliorates urban environmental stresses including heat and drying winds.   Parking lot island bioretention is particularly susceptible to extended dry conditions. A layered planting scheme will help discourage weeds as well as creating suitable microclimates.  There are many potential side benefits to the use of planting systems other than water quality and quantity treatment. Planting systems, if designed properly, can improve the value of the site; provide shade and wind breaks; improve aesthetics; support wildlife; and absorb noise.  Click here for more on plant materials.

CONTINUE TO Organic Layer or Mulch

The above information was derived from the Prince George's County Bioretention Manual.

Photo credit:  T.E. Scott & Associates, Inc.

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The information on this website was compiled by T.E. Scott & Associates, Inc. from various sources.

We make no guarantees or warranties to the applicability of this material to specific applications. 
Last modified: 10/23/09