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
2 ratings

Wednesday - October 10, 2012

From: Rockport, TX
Region: Southwest
Topic: Plant Lists, Herbs/Forbs, Shrubs
Title: Plants for underneath oak tree
Answered by: Nan Hampton

QUESTION:

I have a North facing wall of my house that gets half sunlight half shade depending on the season. I would like to layout some native South Texas plants and complete fill in area to prevent the live oak it is under from sprouting. It is currently watered from an irrigation system four times a week but can be adjusted.

ANSWER:

First of all, Mr. Smarty Plants has had lots of question about controlling oak suckers under trees.   Please visit the answer to a previous question for a good discussion about the merits of the various methods to deal with oak suckers. 

There may be a problem growing plants under your oak tree, not just because it will be shady but because the oak tree has an allelopathic effect on some other plants.  Allelopathy is a situation where a plant releases a chemical that has an effect on another plant.  The effect may be beneficial or harmful, but the ones we hear about the most are those that are harmful to another plant.  One of best known of the allelopathic plants is the walnut tree (Juglans spp.).  It has a very strong effect on most plants attempting to grow beneath it.  Trees with a lesser allelopathic effect include oaks, hackberries and eucalyptus trees.  Red oaks, which in your area is likelly to be either Quercus shumardii (Shumard oak) or Quercus falcata (Southern red oak), are mentioned more often than other oak trees.  You can read more about allelopathy in this article, Allelopathy and Arboriculture:  Theory to Application.  That said, not all plants are susceptible to the oak's chemicals.  Some plants can grow under oaks.  I couldn't find a list of plants native to Texas that reportedly grow under oaks; but, by observation, I can tell you some plants that are native to both South Texas and Central Texas that will grow under oaks. 

 Malvaviscus arboreus var. drummondii (Turk's cap or turkscap) grows in part shade and shade.

Lantana urticoides (Texas lantana) grows best in sun.

Sabal minor (Dwarf palmetto) grows in sun, part shade and shade.

Ilex vomitoria (Yaupon) grows in sun, part shade and shade.  There are dwarf varieties ('Nana' and 'Stokes Dwarf').

Lonicera sempervirens (Coral honeysuckle) will trail across the ground (as well as climb) in sun or part shade.

You can check our list Texas-South Recommended for other possibilities.  The plants on this list are native to your area, commerically available and suitable for landscaping.  You may have to experiment a bit to see if the plants you choose will thrive under your oak.

 

From the Image Gallery


Turk's cap or turkscap
Malvaviscus arboreus var. drummondii

Texas lantana
Lantana urticoides

Dwarf palmetto
Sabal minor

Yaupon
Ilex vomitoria

Coral honeysuckle
Lonicera sempervirens

More Herbs/Forbs Questions

Need Native Plants for Ditch Stabilization in Texarkana, Arkansas
September 14, 2010 - I live in Texarkana, Arkansas. I have a ditch near the street in my front yard that is approximately 90-100 ft. long. It gets full sun. There is a lot of clay and rocks in the ditch. I need to fin...
view the full question and answer

Meadow garden for Colorado Springs CO
June 03, 2012 - We recently purchased a restored home on a mesa just above the downtown area of Colorado Springs on the front range. The previous owners seeded the front lawn with blue gramma and told me that all I ...
view the full question and answer

What to plant between patio flagstones in Austin, TX?
May 16, 2011 - I would like to plant something between my flagstones on the patio. Something that doesn't require a lot of water, low growing, and can stand a little to moderate traffic. It is in a shade to partly...
view the full question and answer

Native plants for gravesite in North Central Massachusetts
May 18, 2008 - I live in North Central Mass. Would like to plant something on my parents gravesite that would not be invasive or require a lot of care. Any suggestions? I just took 2 shrubs out that had become way...
view the full question and answer

Damage to ruellia in Monroe LA
October 26, 2009 - I have hundreds of Ruellia Brittoniana. Dwarf Katie White, Katie Blue and Katie Pink. I am finding holes in some of the leaves, Some just have notches chewed out of them. Some of the leaves have...
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 | STAFF
© 2015 Lady Bird Johnson Wildflower Center