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

Problems with Savannah holly from Livingston TX
October 05, 2013 - Our Savannah Holly standards, planted in spring 2012, are now 10' tall, with 2-3" caliper trunks at the base. Some are in decline or have died. We thought the ribbons holding them to the nursery's ...
view the full question and answer

Evergreen groundcover under pine tree in NY
May 23, 2008 - Hello! I live in upstate NY. I'm trying to find an evergreen ground cover to plant under a pine tree. I believe it's a white spruce (but I'm not postive). I've read conflicting information reg...
view the full question and answer

What is the sticky stuff coming out of the trees in Austin?
October 06, 2009 - Hello - I live in Austin TX, and in the past half month or so, have been noticing much sticky, sweet sap being exuded from trees. In a normal year I only notice the crepe myrtles doing this, but this...
view the full question and answer

Catalpa and maple with dying branches in Wisconsin
July 07, 2008 - We have a northern catalpa in our front yard. It's been there for about three years now and is probably 25' high. This year it appeared to be doing great. It flowered and then all of sudden last ...
view the full question and answer

Old oak tree dropping leaves in Hazlet Township NJ
July 08, 2013 - I am 84 yrs old and have a 50 year old pin? oak. No more acorns, but the leaves are falling in clumps and are still alive. Every day I fill a huge garden bag with them. I live on a fixed income and...
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