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?


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
Not Yet Rated

Thursday - April 23, 2009

From: San Antonio, TX
Region: Southwest
Topic: Diseases and Disorders
Title: Yaupons dying back in San Antonio
Answered by: Barbara Medford


I have 4 yaupon shrubs in the same area for several years. This past winter one turned brown from inside to outside very quickly. It is dead but the roots are not loose. The others began doing the same thing. Near these plants was a rosemary that got some kind of white stuff on it and parts died back so I cut them off. Any chance that could have been the demise of my mature yaupons?


That is strange,because Ilex vomitoria (yaupon) is ordinarily a most dependable plant, able to adapt to a lot of different conditions.  In terms of the "white stuff" on the Rosemarinus officianlis, that plant is native to the Meditteranean, and outside of our area of expertise at the Lady Bird Johnson Wildflower Center. We did learn that this member of the Lamiaceae (mint) sometimes developed powdery mildew if the plant gets too moist. If you are watering extensively and using overhead sprinklers to do so, that might be the source of the problem with the rosemary. However, if you have had your yaupons for several years, under the same conditions, it hardly seems likely the mildew would have spread from the rosemary and done that kind of damage.

Since we are not plant pathologists, we are at a loss to determine what would cause such a tough plant to die back so severely. About all we can do is ask some questions that might lead you to answers. Are you sure the shrubs are dead? Have you scratched the bark and found no living green material under the bark? If there are signs of life, you could try pruning them back, mulching the roots with compost or shredded hardwood mulch, and sticking the hose into the soil to let a slow dribble soak into the root area, and hope they leaf back out. Beyond that, have you seen any evidence of insect damage? Yaupons can be hosts to scale, leaf miners, mites, and aphids, but none of them are considered a serious threat to the vitality of the plant, and you would have seen some indication that the insects were there-holes or tunnels in leaves, honeydew (excretions from aphids and other insects) on which a black sooty mold can grow, or tiny red specks (spider mites) on the bottom of the leaves.

Once you have eliminated any of these possibilities, you need to consider that something external may have caused the problem. Has there been any spraying or spreading of weed and feed fertilizers, herbicides or insecticides?  Could someone have dumped paint or cleaning products into that area without your knowledge? We suggest you go to the website for Texas A&M AgriLIFE Extension for Bexar County, to the Horticulture section, where you will find contact information and, hopefully, someone who can tell you what happened to your yaupons.


More Diseases and Disorders Questions

Should Mexican milkweed (Asclepias curassavica) not be used to attract Monarch butterflies?
November 20, 2015 - Should I remove Asclepias curassavica (Mexican milkweed) in my garden for threat of OE parasitic protozoan threat to Monarch butterflies? Is this threat as widespread as Chronicle implies? I had great...
view the full question and answer

Green cyst-like growths on Texas persimmon leaves
September 20, 2013 - We have a mature Texas persimmon. We just noticed some green cyst-like growths on the tops of some of the leaves. The undersides of those leaves have black spots where the growths are. They looks like...
view the full question and answer

Promoting bloom in Chocolate Summer Mimosa
January 11, 2008 - Please help! I purchased a Chocolate Summer Mimosa from one of our local nurseries. It was a brand new plant to them and they don't really know much about them. I planted it just 3 years ago as an...
view the full question and answer

Changing colors on Mexican Plum trees from Bellaire TX
June 20, 2013 - The leaves on my Mexican Plum tree have recently started turning yellow/brown and the veins in leaves are red. Is this a watering issue or disease issue? Mites are on the leaves. This has been a ra...
view the full question and answer

Yellow-orange fungus on Ash tree in Ohio
July 14, 2009 - Dear Mr. Smarty Plants, I have a large ash tree which started growing some yellowish orange fungus around the base this spring. With this fungus there are also black bugs with a orange marking near i...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
© 2016 Lady Bird Johnson Wildflower Center