En Español

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

Groundcover Planting in Shiro TX
July 09, 2015 - I have been collecting seeds from White Avens and Texas Sedge to use as ground covers. What is the optimal time to plant these seeds? We have been experiencing heavy rains in our area lately, so I am ...
view the full question and answer

Groundcover beneath a maple
January 24, 2009 - I am looking for something to spread out in the shade of a maple tree. I have tried lily of the valley, ferns, pachysandra, ivy, hosta, euonymus.. nothing spreads out.
view the full question and answer

Kinnikinnick for a green roof
July 04, 2012 - Hi Mr. Smarty Plants, I live just north of Seattle and want to build a green roof (outdoor kitchen) I'm concerned about the weight of the soil (saturated), drainage etc. am building from scratch and...
view the full question and answer

Ground cover for New York sloped area
November 24, 2009 - I'm looking for native ground covers (vines?) for steep, heavy shale sloped areas as well as a ground cover in gently sloped area, preferably not higher than 6 inches. All that I've found is non-nat...
view the full question and answer

Possible ground covers under pine trees in Illinois
April 18, 2006 - Have pine trees in front of house. No luck with the lawn around them....was told it's because of ground acidity. Any tips on how to get a lawn to grow there? If not, can you suggest some ground cover...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center