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
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

Non-native sedum 'Burrito' sunburned in Providence RI?
June 28, 2010 - I have a sedum burrito that I keep outside and receives bright sun for around 6 hours a day. it looks like it's getting sunburned, the leaves are getting shriveled and browning on the tips. I've bro...
view the full question and answer

Mountain laurel (Sophora secundiflora) refuses to bloom
March 07, 2008 - We have a Texas Mountain Laurel that gets full sunlight, but does not bloom. It is 4-5 ft tall & 3-4 ft wide & healthy. Is there anything we can do to make it bloom next year?
view the full question and answer

Oaks at Wildflower Center from Wimberley TX
September 05, 2012 - I know you have numerous Quercus fusiformis examples at the ladybird Johnson Wildflower Center. My question is, do you also have Quercus virginiana growing there? Also, is Oak Wilt a disease that ...
view the full question and answer

Smarty Plants on Oleanders
June 11, 2005 - I have 3 Nerium Oleanders. In the winter they come indoors, and are under grow lights. They are in big pots. We just put them outside on patio, and they don't look good. They still have green tips ...
view the full question and answer

Problem with Quercus texana (Nuttall oak) in Alabama
March 12, 2014 - I have a 3" diameter Nuttall Oak that the builder planted when building the house. Last summer I noticed that several spots on the trunk were oozing sap (vertical approximately 1.5" long by 0.5" wi...
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