Explore Plants

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
    
 

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

Monday - July 20, 2009

From: Whitney, TX
Region: Southwest
Topic: Non-Natives, Compost and Mulch, Diseases and Disorders, Watering, Shrubs
Title: Yellow bands around edges of leaves in Whitney TX
Answered by: Barbara Medford

QUESTION:

How can you tell whether esperanzas are getting too much water or not enough - ours have a small yellow band around the edges of the leaves - crape myrtles - same question

ANSWER:

Tecoma stans (yellow trumpetbush) (Esperanza) is native to North America and to Texas, but most of the areas where it is growing are in far south and southwest Texas. It thrives in rocky, alkaline soils and needs watering only about every one or two weeks. We are not sure what kind of soil you have in your area of the state, but if  you have a clay soil, and have not amended the soil for better drainage, that could be the problem. While Texas has been uncommonly dry this year, you have probably been watering your garden, and water may simply be standing on the roots of the bush. If your Yellow Bells has been planted recently, continuing to water is probably important, but drainage is even more important. Work some compost into the soil around the roots and avoid watering with an automatic sprinkler system. Overhead watering (except rain) can cause problems for some desert plants. It also does not need fertilizer, since it is native.

We frequently find that chlorosis can cause yellowing leaves. In the case of the Esperanza, the overwatering of the roots may be preventing the roots from accessing some of the vital trace elements in the soil, especially iron, and this can cause chlorosis. In the case of Lagerstroemia indica, Crape myrtle) there may be the same problem, but in this case we have no information on it in our Native Plant Database because it is non-native. At the Lady Bird Johnson Wildflower Center we are committed to the growth, care and propagation of plants native not only to North america, but to the spot in which they are being grown. 

We checked on the possibility of leaf spot diseases, and found none that fit the description you gave. This Floridata site can give you more information on Lagerstroemia indica but, again, good drainage is about the only recommendation.  Both plants would likely benefit from composting and mulching, and both should be in full sun, 6 or more hours of sun a day.

 

 

 

More Shrubs Questions

Need suggestions for plants for a bird/small wildlife refuge in Wichita Co, TX.
August 26, 2011 - With our continuing drought in North Texas, I'm planning to transform my small backyard into a bird/small wildlife "refuge". What types of native plants and grasses can I plant in dry, hot Wichita ...
view the full question and answer

Exotic plant/shrubs for Marietta, GA.
April 01, 2010 - Hi. I live in Marietta GA. and i am looking to add some curb appeal to my front lawn (around the border of the house). I would like evergreen plants and shrubs. I love the tropical/exotic look. do you...
view the full question and answer

Decorative small evergreen tree for Las Vegas NV
January 06, 2013 - I need a small decorative tree to be planted among a pine tree background; would prefer evergreen.
view the full question and answer

Holding soil on a bank in Goldsboro, NC
July 25, 2010 - I live in Goldsboro, NC on a small ridge with a very steep bank on one side of our property. What native plants can we plant on the bank to help hold the soil. Also, what would be best to plant on t...
view the full question and answer

Yellow-blossomed Shrub that Occurs in Arizona and Texas
May 08, 2012 - What is the name of the large shrubs you will see in Arizona with the bright yellow blossoms. They grow wild everywhere, and I also see them in the town. Could you please tell me the name of them, s...
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.