Rent Shop Volunteer Join

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.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?

Share

Ask Mr. Smarty Plants

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
See a list of all Smarty Plants questions

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

Need help with plant identification, visit the plant identification page.

 
rate this answer
Not Yet Rated

Friday - May 07, 2010

From: Washington, DC
Region: Mid-Atlantic
Topic: Seeds and Seeding, Erosion Control, Groundcovers, Grasses or Grass-like
Title: Ground cover for steep slope in Washington DC
Answered by: Barbara Medford

QUESTION:

We have a steep slope in our garden in Washington DC which has sun from noon to sun set. Could you please recommend some low maintenance plants which would be a good ground cover and limit erosion?

ANSWER:

We would call sun from noon to sunset "sun" (6 or more hours of sun a day) to "part shade" (2 to 6 hours of sun a day).

 

We recommend grasses for controlling erosion because of their extensive fibrous root systems that serve to hold the soil in place.  However, seeding grass is not the whole process.  The seeds need moisture to germinate.  If the moisture comes in the form of rain, it is likely to wash the seeds down the bank  before they have a chance to germinate and take root.  There are two possible solutions—an erosion control blanket or pneumatic compost/seed application.  The erosion-control fabric works by slowing the runoff water and allowing sediments to fall out rather than be washed away. Seeds are sown under the erosion-control material and grow up through the matting when they germinate. You can also insert plants into the soil by cutting through the matting. The roots of the plants that are growing through the erosion-control material anchor the soil to stop the erosion. If you use erosion-control blankets made of biodegrable material, they will eventually disappear leaving the plants to control the problem.  Many nurseries carry this erosion control fabric. 

The compost/seed application may be a bit more complicated and expensive than you had in mind since it does require a pneumatic blower, or some mechanical means, to spread the compost/seed mix. The US Composting Council offers information about suppliers of compost and compost technology, but I don't really know if this could be a do-it-yourself project.  You might check with a landscaping or environmental consulting company in your area who might have the machinery to do this to learn about the feasibility and expense of applying the compost/seed mixture this way. You can find the names of Landscape Professionals and Environmental Consultants in your area that specialize in native plants by searching in our National Suppliers Directory.

We will go to our Native Plant Database and find grasses and perhaps some spreading shrubs native to the District of Columbia that should help with your erosion. These are not lawn-type mowable grasses, but more decorative tall grasses that, being native to your area, will be able to cope with soil and climatic conditions. Follow each plant link to the page on the individual plant for information on expected size and sun requirements. 

Small Shrubs for Washington DC:

Comptonia peregrina (sweet fern)

Epigaea repens (trailing arbutus)

Gaultheria procumbens (eastern teaberry)

Symphoricarpos albus (common snowberry)

Grasses for Washington DC:

Andropogon glomeratus (bushy bluestem)

Carex blanda (eastern woodland sedge)

Carex pensylvanica (Pennsylvania sedge)

Carex texensis (Texas sedge)

Chasmanthium latifolium (Inland sea oats)

Elymus canadensis (Canada wildrye)

Muhlenbergia capillaris (hairawn muhly)

Muhlenbergia schreberi (nimblewill)

From our Native Plant Image Gallery:

 


Comptonia peregrina

Epigaea repens

Gaultheria procumbens

Symphoricarpos albus

Andropogon glomeratus

Carex blanda

Carex pensylvanica

Carex texensis

Chasmanthium latifolium

Elymus canadensis

Muhlenbergia capillaris

Muhlenbergia schreberi

 

 

 

 

 

 

 

 

More Groundcovers Questions

Low groundcover for Possum Kingdom
March 02, 2011 - I am seeking a very low ground cover (advised so snakes and rats won't take cover), that is drought resistant and grows on a rocky steep incline to the lake in full afternoon/evening sun at Possum ...
view the full question and answer

Flower friends for roses in Tyler Texas
June 24, 2011 - I have planted some double red Knockout roses and am looking for plants to go with them to add blue, white, pink and yellow hues. I am interested in planting something that will act as a ground cover ...
view the full question and answer

Non-invasive sun ground cover for Atlanta GA
June 29, 2011 - I would like to find a non-invasive ground cover for zone 7 (Atlanta, GA) in full sun. I had a bed of ivy with daylilies on a slight slope. I have pulled up the ivy but want something that is not as i...
view the full question and answer

Source of dollarweed for shady lawn in Hillsboro TX
December 19, 2011 - I live in Hillsboro,Tx - Where can I get Dollar Weed for my shady lawn?
view the full question and answer

Native lawn replacement for shady areas in Austin
September 11, 2013 - Our front lawn was totally destroyed this summer during some remodeling construction. I am interested in replacing it with native grasses, but we have several oak trees that keep the area fairly shady...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.