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

Monday - November 10, 2008

From: Wichita Falls, TX
Region: Southwest
Topic: Diseases and Disorders
Title: Problems with hibiscus tree in Wichita Falls, TX
Answered by: Barbara Medford

QUESTION:

My Hibiscus trees have black spots on the leaves. What might this be and what is the remedy?

ANSWER:

This must be the week for hibiscus problems. See this very recent previous answer on hibiscus in Florida. You may have a hibiscus native to North America and to Texas, or you may have one of the many non-native tropicals. We will look around and see if we can find information beyond the insects we listed in the previous question that might be causing those black spots, wherever your plant is native to.

We found this article from Bachman's Florist about a tropical hibiscus frequently grown as a tree, Hibiscus rosa-sinensis, native to China,  which specifically addresses the problem of black spots on hibiscus leaves as being caused by the sooty mold that is often the result of aphid infestation. Since this would probably happen whether you had a native or non-native hibiscus, refer to the previous answer referenced above and try a good hard spray of water on the plant's leaves to knock the aphids off the plant. 

Pictures of some hibiscus native to Texas:


Hibiscus aculeatus

Hibiscus coulteri

Hibiscus denudatus

Hibiscus laevis

Hibiscus lasiocarpos

Hibiscus martianus

Hibiscus moscheutos

Hibiscus striatus ssp. lambertianus

 

 

 

More Diseases and Disorders Questions

Film growing on prickly pear from Austin
September 28, 2012 - We've just xeriscaped our front & back yards. Two of the spineless prickly pear cacti have a beige film growing on the paddles. The film is now moving further up the cactus, and one of the upper pad...
view the full question and answer

What to do about leaf spot on Vaccinium myrsinites in Clearwater FL?
June 24, 2010 - I have recently planted many Vaccinium myrsinites (shiny blueberry) in my yard. These plants seem to have many dead twig branches without leaves. The remaining leaves have red spots. I visited a na...
view the full question and answer

Aromatic sumac in Travis County
August 14, 2010 - This is an answer to article in today's, August 14, newspaper. I assume that aromatic sumac is native to Travis county because I have it all over my property. It turns bright red in the fall adding...
view the full question and answer

Elimination of dirt dauber insects
August 18, 2006 - Hello - I live in the southeast part of Guadalupe Co. in the post oak savanna area. Do you have any suggestions on how to control dirt dauber dirt/mud nests. I know these critters are beneficial, bu...
view the full question and answer

Blackened leaves on purple sage in Utopia TX
December 08, 2010 - I live in Utopia Texas and have a 5-ft. Texas Purple Sage that has developed a black appearance on the leaves. What is this and what can I do about it?
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 | STAFF
© 2015 Lady Bird Johnson Wildflower Center