Native Plants
![](../_images/smarty_plants.gif)
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.
Did you know you can access the Native Plant Information Network with your web-enabled smartphone?
Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.
![](../_images/mr_smarty_plants_logo_web_200w.jpg)
rate this answer
![](../_images/star_00.gif)
Thursday - August 16, 2012
From: Brownsville, TX
Region: Southwest
Topic: Non-Natives, Problem Plants, Shrubs
Title: Male or female Jatropha curcas from Brownsville TX
Answered by: Barbara Medford
QUESTION:
How do know the sex of a young Jatropha C. plant? how many weeks before you can tell a boy/girl plant ?ANSWER:
Somewhat to our surprise there were several species of the genus Jatropha, a member of the Euphorbiaceae (spurge) family, native to North America. One that comes closest to your identification of Jatropha C. is Jatropha cathartica (Berlandier's nettlespurge). According to our Native Plant Database, it is endemic to Texas in North America, but also grows in Mexico. This USDA Plant Profile Map shows that it does grow in several counties in South Texas, including Cameron.
Our first question (never actually having heard of this plant before) was "What is Jatropha?" From the African Development Bank - Renewable Energy we found an article with that very title: What is Jatropha? It appears that the plant you are most likely asking about is Jatropha curcas, which is native to Central and South America, but has spread all over the world in tropical and sub-tropical climates. This USDA Plant Profile Map shows this plant has been introduced into Hawaii, Puerto Rico and Florida.
Since this is a non-native and out of our realm of plants native to North America, we are going to give you links to some websites to help you answer your own question. We are curious as to why you would want to propagate this plant? It can be invasive, it has serious toxicity, and isn't particularly attractive. Perhaps you're planning home production of biodiesel for the family car?
From General Biodiesel Jatropha curcas: Poison shrub or environmental savior?
Wikipedia Jatropha curcas
Tropilab Inc. Jatropha Curcas - Physic Nut
More Shrubs Questions
Blue Natives for San Antonio
June 28, 2012 - What are the best flowers or trees to buy since we are always in stage 2 and sometimes in stage 3 water conservation? I love flowers that are blue, preferably year around. THANK YOU
view the full question and answer
Japanese Wineberry in Maryland
July 16, 2014 - Hello, we were at Cunningham Falls in Maryland and I can not identify this plant. If you could I would greatly appreciate it, thank you. It looks like a raspberry but the berries are inside small leav...
view the full question and answer
Philadelphus ernestii under live oak in Pflugerville TX
April 05, 2010 - Will Philadelphus ernestii thrive in the root zone of live oak, or would the oak inhibit its growth? I'd like to plant it just at the edge of the canopy.
view the full question and answer
What hydrangeas can be grown in Austin?
June 02, 2011 - I was told that oak leaf hydrangea was the only hydrangea variety that could be successfully grown in Austin TX. My oakleaf hydrangea is doing great and I would like to plant other varieties. Can you...
view the full question and answer
Failure to bloom of lantanas in San Antonio
July 22, 2010 - Mr. Smarty Plants,
We have lantanas in our front yard. This summer the leaves have turned white and they die to a brown color all the while the leaves are "crispy". At the beginning of the season...
view the full question and answer
Support the Wildflower Center by Donating Online or Becoming a Member today. |