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
Not Yet Rated

Thursday - April 23, 2009

From: Fort Worth, TX
Region: Southwest
Topic: Compost and Mulch, Diseases and Disorders, Shrubs
Title: Yellowing leaves on yaupon in Ft. Worth
Answered by: Barbara Medford

QUESTION:

I planted a Pride of Houston Yaupon Holly in January in full sun. It is blooming little white flowers right now for spring, but a lot of leaves are turning yellow. Do you know what is causing this? Thank you.

ANSWER:

"Pride of Houston" is a trade name for Ilex vomitoria (yaupon). It may have been bred from selections that did better in the more acidic, sandy soils of East Texas. This USDA Plant Profile map does not show yaupon growing in Tarrant County. That doesn't mean it won't, it just means it is not native to that part of the state. We are guessing that the yellowing leaves are the results of chlorosis, which is the yellowing of leaf tissue due to a lack of chlorophyll. Possible causes include poor drainage, damaged roots, compacted roots, high alkalinity and nutrient deficiencies in the plant. The best way to remedy this problem is in improving the drainage around the roots and making the soil nutrients more available to the roots. The soil in Ft. Worth is pretty alkaline, and amending the soil with compost or some other organic material is the best way to unlock those nutrients. You can begin by working as much compost as possible into the soil around the yaupon, and continuing to add compost periodically. Use either the compost or a shredded hardwood mulch to mulch the root area. As this decomposes, it will continue to improve the soil texture, and permit the roots to access the trace elements, especially iron, that they need to get back the green in the leaves. You didn't say what the light exposure on your plants is, but the yaupon does best in part shade, which we consider to be 2 to 6 hours of sun a day. The amount of light a plant is getting can also affect leaf color.


Ilex vomitoria

 


Ilex vomitoria

 


Ilex vomitoria

 

 

 

More Diseases and Disorders Questions

Why are my Junipers turning brown in San Antonio?
May 11, 2009 - My Texas mountain cedars (junipers, I know) are turning brown, limb by limb. What is the problem and how do I save what looks like a dying tree.
view the full question and answer

Oak trees shedding leaves in Denton TX
May 27, 2012 - In Denton, TX we have two mature Quercus buckleyi. It is May 11th 2012 and one of these trees has been shedding green leaves for the last week. The only changes we have made are: planted English ivy...
view the full question and answer

Why are the eastern red cedars in Bastrop/Travis County turning brown?
May 11, 2009 - I live on the Bastrop/Travis county, TX line and have many eastern red cedars on my property. About 10 of them are dying and it has happened quickly with the onset of the warmer weather. I noticed d...
view the full question and answer

Cultivar of Cercis Canadensis from Haskell OK
May 16, 2012 - We have a Hearts of Gold Redbud that first had dark edges to many of its leaves (about 2 weeks after planting). It now has multiple leaves w/ medium-dark brown spots on them. Are we looking at some ...
view the full question and answer

Cottony infestation on Turk's Cap in Austin
July 05, 2010 - The Turks Cap in my front planter is well-established and, overall, happy and blooming. However, some of the top leaves, those in the most shaded area, have what looks like a thin, loose layer of cot...
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