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
1 rating

Thursday - April 05, 2012

From: Phoenix, AZ
Region: Southwest
Topic: Diseases and Disorders, Trees
Title: Texas wild olive tree
Answered by: Ray Mathews

QUESTION:

I live in the Phoenix area. My Texas wild olive (Cordia boissieri) is about 5 years old, about 12 feet tall and has beautiful blossoms all year long. However, this past year (through all seasons) some of its leaves developed yellow/brown spots and other leaves are completely brown and falling off. I am not able to find much information on the diseases of this plant. Might this be a lack of N2? a mold? overwatering? ???? Any guidance you might be able to provide would be appreciated. Thank you.

ANSWER:

The wild olive tree Cordia boissieri (Mexican olive) is an evergreen native only to Texas in the U.S.,  but also to several states in northern and southern Mexico, including Coahuila, Nuevo Leon, San Luis Potosi, Tamaulipas, and Veracruz, per the following Agricultural Research Service, Germplasm Resources Information Network link. This rare small tree is reportedly ideal as an ornamental for confined areas. It is drought tolerant and insect and disease pests are generally of no concern. Birds and other wildlife feed on the fruit. It blooms in late May through early June.

However, since Cordia boissieri isn’t native in Arizona , it may be the wrong plant for Arizona. The symptoms you are observing may be due to mold or overwatering. We don't believe that nitrogen deficiency is the problem.

Bill Britt’s garden website offers the possibility of frost as an immediate cause, but the earlier browning does not follow the description for these symptoms?

We believe that you need someone who can look at the plant, and make an informed assessment. For that we suggest you contact the folks at the Maricopa County Office of Arizona Cooperative Extension for some help closer to home.

 

 

 



 

From the Image Gallery


Mexican olive
Cordia boissieri

More Diseases and Disorders Questions

Soapberry Transplant shock symptoms
July 21, 2006 - Please suggest a cause & cure for general yellowing of the leaves of Western Soapberry when planted in the ground 20 miles NW of Austin (thin, poor clay over limestone). Trees still in containers are...
view the full question and answer

Problems with Blackeyed Susans in Philadelphia
May 26, 2009 - For 8 years I successfully grew Black Eyed Susans in a fairly large area in my garden. For the last two years,almost immediately upon pushing through the ground they develop black spots and then appe...
view the full question and answer

Palm trees turning orange in Miami
May 24, 2010 - Why are my palm trees turning orange?
view the full question and answer

Desert Willow and Orchid tree with no upper leaves from Kerrville TX
May 30, 2013 - I have two 5 year old Desert Willows planted in my yard. This year only one has leaved out and blooming. The other is bare but the branches are not dead and it has new growth at the bottom. Do you kno...
view the full question and answer

More trees to go with live oaks in Schertz TX
July 13, 2010 - We moved to a new house that has two recently planted live oak trees. Other than those two little trees there is nothing else on the property. Because of what I read about the oak wilt I would like ...
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