En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Plants under an oak tree from Corpus Christi TX

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
Not Yet Rated

Saturday - June 30, 2012

From: Corpus Christi, TX
Region: Southwest
Topic: Planting, Herbs/Forbs, Trees
Title: Plants under an oak tree from Corpus Christi TX
Answered by: Barbara Medford

QUESTION:

My project: To grow white turk's cap under an old oak tree I first planted St. Augustine sod this spring because we had many oak suckers around the tree. We mixed new soil and compost, and laid the sod. Some suckers are coming through, but the grass is growing. Then I planted the turk's cap but had to cut through sod and oak tree roots in order to have deep and wide enough holes. I water twice a day in the South Texas heat or maybe it's because the sod and plants are competing for water. Some of the white turk's cap didn't make it, so I tried the red and pink Pam's Puryear varieties. Although I do have a few planting issues, Mr. Smarty Plants, do you have any recommendations for success with my planting project? Thank you!

ANSWER:

First, just to establish where we are: Malvaviscus arboreus var. drummondii (Turk's cap or turkscap) blooms both white and red, and is native both to North America and Texas and, according to this USDA Plant Profile Map, also grows natively in and around Nueces County. Malvaviscus arboreus var. drummondii   'Pam Puryear' (Pam Puryear Turk's Cap) is a hybrid between drummondii and Malvaviscus arboreus (Turkscap), both of which are native and the hybrid produces a pink flower, but will not appear in our Native Plant Database.

St. Augustine grass is native to Africa, but in view of the amount of shade you have, it may well be the only grass that will survive. Unfortunately, in these days of heat and water shortages, it is high maintenance and requires a lot of water. We are encouraging the use of native grasses although, as we said there isn't much to recommend for shade. Had you asked in advance, we might have recommended a good quality mulch over those tree roots instead of the grass; however, it's a little difficult to unplant. On the subject of the oak suckers you initially were trying to eliminate, please read this previous Mr. Smarty Plants question.

Now, let's go on to the part of your garden we consider most important: the oak tree. This is a very valuable part of your landscaping and, although you didn't tell us what kind of oak it is, many oaks are threatened by Oak Wilt Disease. This is often spread by work done around the oak trunk or cutting the roots, resulting in a wound.

So, recommendations for your project? Don't cut any more oak roots. Remember that oaks possess the trait called allelopathy, in which they emit substances to discourage competitive plants beneath them. You could do everything right and the plants below that oak will still die. We think you are watering too much. If the dirt in the planting holes was not amended for drainage, that extra water may be just standing on roots. You haven't done a single thing that we haven't done in the past. What you do is learn from the results. Your plants may all do beautifully, the oak sprouts may die away and the oak continue in good health for many more years. But if they don't, just figure out why and don't do it again.

 

From the Image Gallery


Turk's cap or turkscap
Malvaviscus arboreus var. drummondii

Turkscap
Malvaviscus arboreus

More Planting Questions

Need a shade tree for an enclosed courtyard in Las Cruces, NM
September 24, 2012 - I HAVE A WEST FACING COURTYARD ENCLOSED WITH A 6' STUCCO WALL AND I WANT TO ADD A SHADE TREE. CURRENTLY HAVE SEVERAL MESQUITE TREES, DESERT WILLOW, CHINESE PISTACHE & VITEX TREES IN THE FRONT AREA ...
view the full question and answer

Ground cover for sun in Phenix City, AL
April 04, 2011 - I live in Phenix City, AL and am new to planting. I have a 60 x 15 feet slope that is just dirt. I am going to till it next week and want to plant some various ground cover plants (that will grow to c...
view the full question and answer

Ornamental grasses under desert willows from Dallas, TX
September 06, 2013 - I am planning on planting 3 desert willows in full sun, below the power lines at the back of my back yard in the White Rock Lake area of Dallas. I would like to plant some ornamental grasses in the be...
view the full question and answer

Patience for slow-growing Baptisia
July 07, 2004 - I have three different varieties of well established Baptisia that I have had for several years ... none of them bloom. One of my plants got a very small flower in April, but just pooped out after th...
view the full question and answer

Transplant shock in Liatris spicata
May 25, 2008 - I bought a liatris spicata start a month ago, and transplanted it into my front yard (full sun, clay soil, moist due to all the rain recently). The plant immediately wilted so I transplanted it in ...
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