En EspaŅol

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
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
 
rate this answer
1 rating

Saturday - January 03, 2009

From: Conroe, TX
Region: Southwest
Topic: Erosion Control
Title: Plants for erosion control in East Texas
Answered by: Nan Hampton

QUESTION:

We have recently moved to Conroe and are having a problem with erosion behind a retaining wall (installed by previous owner. The retaining wall is made of concrete and is about 8 foot tall by 110 foot long.) that separates our back yard from a small creek. I have been reading about corrective actions, but am not sure what method is best. As far as I understand, at this point I need to fill eroded areas with crushed granite, cover with topsoil, spread grass seed, then cover with fiber roll. My question is; is this the correct thing to do and what grasses, or perennials (we like having herbs around) would grow best in this unstable, and very shady area? Oh, also, do you know where a person would purchase Fiber Roll?

ANSWER:

Your plan sounds like a good one although I am not sure whether the crushed granite is necessary.  I would think it depends how deep the erosion is whether you need that addition.  If you are filling in more than a few inches, it is probably necessary to add the crushed granite. Otherwise, I would think topsoil would be sufficient.  The fiber roll or erosion blanket should serve to hold the soil in place until the grasses have become established.  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.  Here is some information about fiber rolls and erosion control blankets.  It is possible that large garden supply/landscape supply centers would have these products.  Since you live near Houston, you might try calling some of those in Houston to determine availability there.  You can search in our National Suppliers Directory for nurseries and landscape companies in or near Houston that specialize in native plants.  The Houston Chapter of the Native Plant Society of Texas also has a list of Sources of Native Plants in the Houston Area.  You can also search on the internet for manufacturers of erosion control blankets and contact them for distributors in your area.  You are correct that grasses are ideal for stopping erosion because of their extensive fibrous root system.  You can also add other plants along with them.  Now for plants to use in your shady areas, you can find a list of "commercially available native plant species suitable for planned landscapes in East Texas" by selecting that area from the map or the pull-down menu on our Recommended Species page.  You can use the NARROW YOUR SEARCH option to select plants that meet your requirements.  For instance, you can select 'Grass/Grass-like' from the "Habit (general appearance)" and 'Shade' under "Light requirement".  Here are some grasses from that list, as well as others that I have selected, that will grow in the shade.

Grasses and grass-like plants:

Bouteloua curtipendula (sideoats grama) grows 2-3 feet tall

Chasmanthium latifolium (Inland sea oats), 2-4 feet and has an attractive appearance even after it browns in the fall and winter

Sorghastrum nutans (Indiangrass), 3-8 feet

Carex blanda (eastern woodland sedge), not technically a grass, but it is grasslike and makes a good ground cover less than 2 feet tall

Elymus canadensis (Canada wildrye), 2-4 feet

Muhlenbergia schreberi (nimblewill), a low-growing (usually less than 1 foot) attractive grass that loves the shade

Herbaceous plants that will grow in the shade.  You can sow their seeds along with the grass seeds:

Salvia coccinea (blood sage)

Rudbeckia hirta (blackeyed Susan)

Phlox divaricata (wild blue phlox)

Coreopsis lanceolata (lanceleaf tickseed)

Shrubs/small trees that can be planted by cutting through the erosion control blankets to insert them:

Ceanothus americanus (New Jersey tea) grows to 3 feet.

Cornus drummondii (roughleaf dogwood), to 16 feet

Cornus florida (flowering dogwood), 20-40 feet

Hydrangea quercifolia (oakleaf hydrangea), 3-12 feet

Rhododendron oblongifolium (Texas azalea), to 6 feet


Bouteloua curtipendula

Chasmanthium latifolium

Sorghastrum nutans

Carex blanda

Elymus canadensis

Muhlenbergia schreberi

Salvia coccinea

Rudbeckia hirta

Phlox divaricata

Coreopsis lanceolata

Ceanothus americanus

Cornus drummondii

Cornus florida

Hydrangea quercifolia

Rhododendron oblongifolium

 

 

 

More Erosion Control Questions

Landscaping recommendations for site in Dubuque, IA
March 27, 2010 - I need a seed recommendation. Here are the variables: Location: Dubuque, IA (east Central Iowa) Soil type: Sandy to sandy and gravelly. Part is a riverbank facing east. Steep bank then flat to ...
view the full question and answer

Need plants to control erosion on a hillside in Nashville, TN.
February 28, 2012 - Recently, a rogue contractor scraped all the sod off of my Tennessee hillside. Now the clay soil is exposed and washing away quickly. The hill slope is approximately 30 degrees. In the spring I'd ...
view the full question and answer

Groundcover for foot traffic in dry shade from Prineville OR
May 12, 2013 - I live in central Oregon. I have an area under a large elm tree that slopes on all sides and has lots of foot traffic and no sun. (my kids have a swing in the tree and play around it a lot.) It's a v...
view the full question and answer

Plants for a hillside in WI
February 18, 2012 - I live in Wisconsin and am currently doing a research project on plant variation on the north and south sides of a hill. I was wondering you could suggest any books to me that would address this issue...
view the full question and answer

Winter groundcover for shaded backyard in Austin
January 10, 2013 - I live in south Austin and have a shaded backyard. During the summer, the lawn died and the ground is now bare. I'd like to plant some kind of winter grass or ground cover that will hold the soil i...
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center