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?


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

Sunday - September 28, 2008

From: Iredell, TX
Region: Southwest
Topic: Non-Natives
Title: Non-native Senna corymbosa
Answered by: Barbara Medford


I have a large Texas Senna tree - at least 7'x8'. It is covered in beautiful yellow blooms; however, it will need to be pruned in the winter. Please let me know how much to prune it and when is the best time to do so.


There is a plant, Seymeria texana (Texas blacksenna), that is endemic to Texas, in a few Central and South Central Texas counties. (USDA Plant Profile county map) We couldn't even find any pictures of it except in our own Native Plant Database, see pictures below. It appears to be a weedy, semi-vine plant that grows in difficult areas, and we are pretty sure this is not the plant you are asking about.

We then went Googling on "Texas Senna Tree" and found this forum, Dave's Garden, where we learned that Senna corymbosa, Texas Senna Tree, is instead a native to Argentina, Brazil and Uruguay. Retailers can, and do, put any name they choose on a plant, and apparently felt that naming this plant after Texas would make it more attractive to buyers.

Picture of Senna corymbosa from Dave's Garden.

While we would like to answer all questions we receive, Mr. Smarty Plants' expertise is limited to plant species native to North America, their habitats and cultivation. Limited resources require us to decline answering questions that delve into other areas. We hope you understand.We suggest you Google on the botanical name Senna corymbosa, where you may find some more information. 

Seymeria texana

Seymeria texana

Seymeria texana



More Non-Natives Questions

Non-native bermudagrass dying under non-native globe willow in Granbury TX
July 14, 2010 - We have a beautiful globe willow in our back yard with bermuda grass. All the grass is thinning out or dying under the tree. What can we do, is there another glass we could use that blends well with...
view the full question and answer

Plant identification
February 20, 2014 - I'm not sure of county of origin. It was given to me by someone I no longer have contact with. When I initially received it I thought it was just a small potted vine of some type. I've had it a yea...
view the full question and answer

Non-native pistacio problem Rockwall, TX.
July 02, 2014 - I have an eight year old Pistacio tree that has leaves turning brown and falling off. It is June! Why?
view the full question and answer

Problems with non-native navel orange
October 03, 2008 - Hello Green Guru, Question: Why hasn't Navel Orange Tree grown or sprouted new branches? It's 3 years old and is about 5 feet tall and has remained this size. It hasn't grown at all. It only ha...
view the full question and answer

Preservation of a non-native Norfolk pine after hurricane damage
October 11, 2008 - I had a 25ft. Norfolk pine blow down during hurricane. I have the top 6ft.in water living after 3 weeks. Can I plant this hoping it will survive? Do I need to cut into the trunk or just trim back the ...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
© 2015 Lady Bird Johnson Wildflower Center