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
1 rating

Friday - September 06, 2013

From: Dallas, TX
Region: Select Region
Topic: Planting, Soils, Shade Tolerant, Grasses or Grass-like, Trees
Title: Ornamental grasses under desert willows from Dallas, TX
Answered by: Barbara Medford

QUESTION:

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 beds under the willows. What ornamental grasses would do well in this situation?

ANSWER:

First of all, we're begging you, don't buy nor plant those desert willows until late Fall or early Winter. That is asking for transplant shock and early death if you plant them in the blazing heat and drought under which all of Texas is suffering. November is about as early as we would think safe and you don't want them standing in a black plastic pot having their roots fried in the sun until then, either. From our webpage on Chilopsis linearis (Desert willow) here are the optimum growing conditions for this small tree.

"Growing Conditions

Water Use: Low
Light Requirement: Sun
Soil Moisture: Dry , Moist
CaCO3 Tolerance: Medium
Drought Tolerance: High
Cold Tolerant: yes
Heat Tolerant: yes
Soil Description: Well-drained limestone soils preferred, but also does well in sands, loams, clays, caliches, granitic, and rocky soils. Minimal organic content the norm.
Conditions Comments: Allow to dry out between waterings, as this will encourage more extensive waves of blooms. Avoid excessive water and fertilizer, as that can lead to overly rapid growth, fewer blooms, and a weaker plant. Prolonged saturation can result in rot. Wont grow as fast or get as large in clay soil but wont suffer there either. Can be drought-deciduous in some regions. Can survive temperatures as low as 10 degrees F."

According to this USDA Plant Profile Map, this tree is reported as growing mostly in far West Texas, and about the only county where it is reported in North Central/North East Texas is Dallas County, so it would appear you would have an appropriate soil. If you have clay soil, and you very likely do, even though Desert Willow will tolerate clay soils, it will NOT tolerate water standing on its roots, as often happens with clay soils. When you get to the cooler season and can plant your little trees, dig a bigger hole than is necessary for the roots and mix the soil from the hole with some sand, degenerated granite or (our favorite) compost. This will loosen up the clay and permit the tiny hairlike rootlets to penetrate the soil for oxygen and nutrients.

Otherwise, we think your plant choice is a good one, as it won't grow tall enough to interfere with power lines and will bloom much better with more sun. We wanted to establish first what the tree needed, as we think that is of prime importance, and then find grasses that can prosper in the same conditions. The grasses will need to be able to tolerate partial shade but not the deep shade they would encounter in a denser or evergreen tree, like live oaks. We will go to our Native Plant Database, scroll down the page to "Combination Search," indicate Texas as the state, "grass or grass like" for Habit, "moist" for Moisture Requirements, and "part shade" for Light Requirements. This will make it possible for the grasses to live in the same environment as the tree, and tolerant of the part shade the tree will cast. We will also check each of our selections on the USDA Plant Profiles to assure that the chosen grasses will do well in Dallas County. You can follow each plant link to our webpage on that plant to find out its growing conditions and soil preferences.

Native ornamental grasses for Dallas, TX:

Chasmanthium latifolium (Inland sea oats)

Andropogon gerardii (Big bluestem)

Bouteloua curtipendula (Sideoats grama)

Carex texensis (Texas sedge)

Poa arachnifera (Texas bluegrass)

Sorghastrum nutans (Indiangrass)

If you have difficulty in locating these plants native to Texas in local nurseries, go to our National Suppliers Directory, type in your town and state or just your zipcode in the "Enter Search Location" box, click on GO and you will get a list of native plant nurseries, seed suppliers and consultants in your general areal. Each have contact information so you can find out ahead of time if they have what you are looking for.

 

From the Image Gallery


Desert willow
Chilopsis linearis

Desert willow
Chilopsis linearis

Desert willow
Chilopsis linearis

Inland sea oats
Chasmanthium latifolium

Big bluestem
Andropogon gerardii

Sideoats grama
Bouteloua curtipendula

Texas sedge
Carex texensis

Texas bluegrass
Poa arachnifera

Indiangrass
Sorghastrum nutans

More Planting Questions

Permit to transport trees in Ivanhoe TX
December 02, 2010 - Do you have to have a special permit to transport trees on a semi truck and trailer in Texas? They are Texas grown trees, just going to a different location inside the state.
view the full question and answer

Shrub that will grow outside in Zone 5 from Millbrook NY
April 21, 2012 - Is there any shrub, tree or other sort of plant that will grow well in zone 5 in a very large container outdoors?
view the full question and answer

Splash-proof plants from Oakton VA
October 01, 2012 - Hi Mr Smarty Plants, Re: low, evergreen ground cover, Northern Virginia The bare soil around my freshly painted screen porch splashes up onto the white framing when it rains so I am looking for ...
view the full question and answer

Planting and care of Desert Willow in Golden Valley, AZ.
May 17, 2013 - I got a desert willow to plant in yard. Some of the leaves dried out before I could plant. Will that stop the tree from growing into a decent size tree or stay as a shrub?
view the full question and answer

Plantings for beneath a red oak in Lubbock TX
February 23, 2012 - What would you recommend to plant in a two tiered raised bed facing west, totally blocked from the east, thus receiving only the afternoon sun? A 21 year old red oak sits in the middle of the upper ra...
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